International Journal of Thermofluids最新文献

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Nanoparticles enhanced phase change materials for thermal energy storage applications: An assessment 纳米颗粒增强相变材料在热能储存中的应用:评估
International Journal of Thermofluids Pub Date : 2025-04-07 DOI: 10.1016/j.ijft.2025.101207
M.M. Ismail , I. Dincer , Y. Bicer , M.Z. Saghir
{"title":"Nanoparticles enhanced phase change materials for thermal energy storage applications: An assessment","authors":"M.M. Ismail ,&nbsp;I. Dincer ,&nbsp;Y. Bicer ,&nbsp;M.Z. Saghir","doi":"10.1016/j.ijft.2025.101207","DOIUrl":"10.1016/j.ijft.2025.101207","url":null,"abstract":"<div><div>Effective utilization of Phase Change Materials (PCMs) has gained significant potential for thermal energy storage (TES) applications due to their high latent heat capacity, making them highly efficient for storing thermal energy. This property enables PCMs to serve a critical role in shaping the future of TES systems. However, conventional PCMs face a significant challenge when it comes to low thermal conductivity, hindering their overall performance and broader application. The integration of nanoparticles into PCMs, forming nanoparticles-enhanced PCMs (NPCMs), has emerged as a promising solution to overcome these limitations. NPCMs exhibit improved thermal properties, including higher thermal conductivity, faster temperature response, and increased storage capacity. These enhancements make NPCMs a viable option for addressing the shortcomings of traditional PCMs, thereby improving TES system efficiency and reliability. This perspective article provides a comprehensive overview of NPCMs for thermal energy storage applications, discussing recent advancements, current challenges, and future opportunities. By examining the properties, performance, and integration techniques of NPCMs, this review highlights their potential to revolutionize TES systems and contribute to the development of sustainable energy solutions.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"27 ","pages":"Article 101207"},"PeriodicalIF":0.0,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143844159","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Significance of Rosseland’s radiative process in magnetohydrodynamic Darcy–Forchheimer non-Newtonian fluid flow in a parabolic trough solar collector: Probable error Rosseland辐射过程在抛物线槽太阳能集热器中磁流体动力学Darcy-Forchheimer非牛顿流体流动中的意义:可能的误差
International Journal of Thermofluids Pub Date : 2025-04-06 DOI: 10.1016/j.ijft.2025.101193
Anum Shafiq , Tabassum Naz Sindhu , Muhammad Ahmad Iqbal , Tahani A. Abushal
{"title":"Significance of Rosseland’s radiative process in magnetohydrodynamic Darcy–Forchheimer non-Newtonian fluid flow in a parabolic trough solar collector: Probable error","authors":"Anum Shafiq ,&nbsp;Tabassum Naz Sindhu ,&nbsp;Muhammad Ahmad Iqbal ,&nbsp;Tahani A. Abushal","doi":"10.1016/j.ijft.2025.101193","DOIUrl":"10.1016/j.ijft.2025.101193","url":null,"abstract":"<div><div>Thermal energy is produced from sunlight through solar thermal collectors, with the parabolic trough solar collector (PTSC) playing a crucial role in concentrated solar power (CSP) technologies by capturing solar energy at temperatures between 325 and 700 K. The tangent hyperbolic fluid model, a non-Newtonian fluid model, effectively predicts shear thinning behavior, as shown in experimental studies. This model’s rheological properties at varying shear rates contribute to its superior heat transmission performance. This study investigates the thermal efficiency of Darcy–Forchheimer magnetohydrodynamic tangent hyperbolic fluid flow in inclined cylindrical films, incorporating a non-uniform heat source/sink in the PTSC framework. The analysis considers the effects of radiation alongside the non-uniform heat source or sink on thermal phenomena. By applying relevant transformations, the governing equations are reformulated into a nonlinear ordinary differential system, solved using the Runge–Kutta fourth-order method with the shooting technique. Results are analyzed mathematically and graphically. The correlation coefficient is used as a statistical metric to examine the relationship between key parameters and their effect on the skin friction coefficient (SKF) and local Nusselt number (LNN). This approach evaluates potential errors to determine statistical significance. Findings show that Reynolds number exhibits a strong correlation of 0.8828 with SKF and 0.9769 with LNN, suggesting significant effects on heat transfer. Notably, parameters such as local porosity number and magnetic number affect SKF, while local porosity and mixed convection parameters strongly correlate with LNN, indicating that utilizing such fluids in PTSCs can enhance heat transmission rates and optimize solar energy utilization, ultimately improving system efficiency.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"27 ","pages":"Article 101193"},"PeriodicalIF":0.0,"publicationDate":"2025-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimization of heat transfer analysis on an aggregated nanofluid flow over a thin porous needle: Sensitivity analysis approach 细孔针上聚集纳米流体流动的传热分析优化:灵敏度分析方法
International Journal of Thermofluids Pub Date : 2025-04-05 DOI: 10.1016/j.ijft.2025.101191
K.M. Nihaal , U.S. Mahabaleshwar , N. Swaminathan , G.V. Bognar
{"title":"Optimization of heat transfer analysis on an aggregated nanofluid flow over a thin porous needle: Sensitivity analysis approach","authors":"K.M. Nihaal ,&nbsp;U.S. Mahabaleshwar ,&nbsp;N. Swaminathan ,&nbsp;G.V. Bognar","doi":"10.1016/j.ijft.2025.101191","DOIUrl":"10.1016/j.ijft.2025.101191","url":null,"abstract":"<div><div>The main aim of this work is to investigate the impact of Thermophoresis and Brownian motion on the Darcy-Forchheimer nanofluid model with convective boundary across a thin moving needle. With a suitable similarity approach, the Partial differential equations are reduced to non-dimensional ordinary differential equations. Further, these ordinary differential equations are solved numerically via the Runge Kutta Fehlberg (RKF-45) method. The influence of the various dimensionless constraints on momentum, thermal, and concentration profiles is examined with/ without aggregation visually through graphs. The observation reveals that the velocity profiles decrease for increasing values of Forchhiemer number. It is found that elevating values of Brownian motion elevate both thermal and concentration profiles and augmented values of thermophoresis boost thermal profile whereas a declining trend is seen in concentration profile with a rise in thermophoresis parameter. The outcomes reveal that the Nusselt number increased more with nanoparticle aggregation compared to without nanoparticle aggregation for rising Forchhiemer number whereas same trend is witnessed in Sherwood number for increasing value of Lewis number. The results from the sensitivity analysis show that heat source/sink has a significant impact on Nusselt number. Employing nanofluids with optimal nanoparticle aggregation, the findings can be used to enhance the efficacy of heat management systems in various industrial sectors like automotive and electronics.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"27 ","pages":"Article 101191"},"PeriodicalIF":0.0,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Recent developments in the thermal radiative flow of dusty Ellis trihybrid nanofluid with activation energy using Hamilton-Crosser thermal conductivity model 利用汉密尔顿-克罗斯热导模型研究具有活化能的埃利斯三混合纳米流体尘埃热辐射流的最新进展
International Journal of Thermofluids Pub Date : 2025-04-05 DOI: 10.1016/j.ijft.2025.101205
Mostafa Mohamed Okasha , Munawar Abbas , Ali Akgül , Shoira Formanova , Talib K. Ibrahim , Murad Khan Hassani
{"title":"Recent developments in the thermal radiative flow of dusty Ellis trihybrid nanofluid with activation energy using Hamilton-Crosser thermal conductivity model","authors":"Mostafa Mohamed Okasha ,&nbsp;Munawar Abbas ,&nbsp;Ali Akgül ,&nbsp;Shoira Formanova ,&nbsp;Talib K. Ibrahim ,&nbsp;Murad Khan Hassani","doi":"10.1016/j.ijft.2025.101205","DOIUrl":"10.1016/j.ijft.2025.101205","url":null,"abstract":"<div><div>This study scrutinizes the characteristics of activation energy on Darcy Forchheimer radiative flow of dusty Ellis trihybrid nanofluid over a Riga plate when dust and nanoparticles are present. The goal of the present work is to use the Hamilton-Crosser thermal conductivity model to scrutinize the heat transmission for the Darcy Forchheimer flow of dusty Ellis trihybrid nanofluid. The flow is impacted by heat source with the properties of Marangoni convection. The base fluid, propylene glycol (<em>C</em><sub>3</sub>H<sub>8</sub><em>O</em><sub>2</sub>), is mixed with <em>Ag, TiO</em><sub>2</sub> and A<em>l</em><sub>2</sub><em>O</em><sub>3</sub> nanoparticles. The model is applicable to sophisticated heat transfer systems, including solar energy harvesting and electronic device cooling technologies. Additionally, it finds application in thermal management of industrial processes using nanofluids and aerospace engineering. Using the shooting technique, the numerical results of the governing equations are obtained (RKF-45th). The impacts on dimensionless physical quantities of interest of geometrical and physical properties relevant to this study are analysed using the required tables and figures. The results demonstrated that the Ellis fluid parameter raised the heat transmission, mass transmission rate, and velocity profiles. As the chemical reaction parameter upsurges, the concentration distributions decrease.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"27 ","pages":"Article 101205"},"PeriodicalIF":0.0,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143829284","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparative study of finned tube geometries and TPMS heat exchangers for enhanced freshwater production in humid environments 翅片管几何形状与TPMS换热器在潮湿环境下提高淡水产量的比较研究
International Journal of Thermofluids Pub Date : 2025-04-05 DOI: 10.1016/j.ijft.2025.101190
Omar Abdelqader , Kabbir Ali , Rashid K. Abu Al-Rub , Mohamed I. Hassan Ali
{"title":"Comparative study of finned tube geometries and TPMS heat exchangers for enhanced freshwater production in humid environments","authors":"Omar Abdelqader ,&nbsp;Kabbir Ali ,&nbsp;Rashid K. Abu Al-Rub ,&nbsp;Mohamed I. Hassan Ali","doi":"10.1016/j.ijft.2025.101190","DOIUrl":"10.1016/j.ijft.2025.101190","url":null,"abstract":"<div><div>This study investigates freshwater production from atmospheric air using various tube shapes and orientations, including smooth and finned surfaces, as well as structures based on triply periodic minimum surface (TPMS) topologies: Schoen's Gyroid and IWP. Utilizing verified 3D computational fluid dynamics (CFD) models, the research compares the efficiency of these designs under identical humidity and flow conditions, focusing on optimizing surface area for enhanced water vapor condensation. The findings reveal that horizontally oriented tubes outperform vertical ones, primarily due to their larger length-to-diameter ratio and the fins alignment. Notably, a horizontal annular finned tube significantly boosted the condensation rate by a factor of 2.3. The Gyroid-Solid TPMS structure demonstrated a 40 % increase in water production compared to the annular finned tube, while the IWP-Solid structure produced 10 % more. Conversely, at low Reynolds numbers, Gyroid and IWP sheet structures condensed less water than finned tube due to the lower flow momentum through the TPMS pores. However, at higher Reynolds numbers, the Gyroid sheet outperformed the finned tube by enhancing flow turbulence, with the IWP- Sheet structure yielding comparable results. This study underscores the potential of TPMS structures and the impact of flow dynamics and orientation on optimizing freshwater production from atmospheric air.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"27 ","pages":"Article 101190"},"PeriodicalIF":0.0,"publicationDate":"2025-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143821149","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Instability analysis of Reynolds nanofluid model for boundary layer flow of MHD NTNN fluid over a rotating disk with isotropic and anisotropic roughness 具有各向同性和各向异性粗糙度的旋转圆盘上MHD NTNN流体边界层流动的Reynolds纳米流体模型的不稳定性分析
International Journal of Thermofluids Pub Date : 2025-04-04 DOI: 10.1016/j.ijft.2025.101195
Sohail Nadeem , Tousif Iqra , Inayat Ullah , Jehad Alzabut
{"title":"Instability analysis of Reynolds nanofluid model for boundary layer flow of MHD NTNN fluid over a rotating disk with isotropic and anisotropic roughness","authors":"Sohail Nadeem ,&nbsp;Tousif Iqra ,&nbsp;Inayat Ullah ,&nbsp;Jehad Alzabut","doi":"10.1016/j.ijft.2025.101195","DOIUrl":"10.1016/j.ijft.2025.101195","url":null,"abstract":"<div><div>This work investigates the linear convective instability of magnetohydrodynamics MHD Nadeem trigonometric non-Newtonian (NTNN) fluid of Reynolds nanofluid over rough rotating disks with incompressible boundary-layer flows, using the MHD NTNN model to consider the effects of yield stress and shear-thinning on complicated fluids. We incorporate surface roughness effects with the NTNN model. New steady-flow profiles are derived, and shear-dependent viscosity is considered by extending the partial-slip roughness model. Linear stability analyses show the stabilizing effect of non-Newtonian fluids in the presence of certain types of surface roughness. This is observed in changes to the critical Reynolds number and the rates at which instabilities grow. When surface roughness, magnetic fields (MHD), Non-Newtonian, and nanofluids interact, Type I (inviscid crossflow) instability mode shows enhanced stabilization. Additionally, these factors show an effect on energy dissipation, total energy, and production terms, which further support this assumption. A similarity solution is used to simplify and numerically solve the governing nonlinear ordinary differential equations. The base flow solutions are computed using the BVP4C technique, which is based on a fourth-order Runge-Kutta scheme. The stability equations are then solved using the Chebyshev collocation method, which yields disturbance eigenfunctions and neutral stability curves for convective instabilities. Accordingly, across a range of parameter values, the neutral curves of convective instabilities in boundary-layer flow over a rotating disk can be determined, yielding information on the stability behaviour under different physical situations. The physical mechanisms are explained by an integral energy equation analysis, which shows that even in the presence of non-Newtonian effects, surface roughness and viscosity enhanced by nanoparticles maintain energy balance and flow stability. The findings presented in this study contribute to the knowledge of stability in boundary-layer flows, which can have significant implications for various fields such as fluid engineering and nanofluid methods.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"27 ","pages":"Article 101195"},"PeriodicalIF":0.0,"publicationDate":"2025-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143817317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Optimization and sensitivity analysis of unsteady MHD mixed convective heat transfer in a lid-driven cavity containing a double-pipe circular cylinder using nanofluids 纳米流体驱动双管圆柱腔内非定常MHD混合对流换热优化及灵敏度分析
International Journal of Thermofluids Pub Date : 2025-04-02 DOI: 10.1016/j.ijft.2025.101197
U.K. Suma , M. Masum Billah , Aminur Rahman Khan
{"title":"Optimization and sensitivity analysis of unsteady MHD mixed convective heat transfer in a lid-driven cavity containing a double-pipe circular cylinder using nanofluids","authors":"U.K. Suma ,&nbsp;M. Masum Billah ,&nbsp;Aminur Rahman Khan","doi":"10.1016/j.ijft.2025.101197","DOIUrl":"10.1016/j.ijft.2025.101197","url":null,"abstract":"<div><div>The present investigation focuses on optimizing and conducting a response surface analysis for unsteady laminar mixed convective heat transfer in a rectangular lid-driven cavity with a heated double-pipe utilizing water-based graphene nanofluid. The effects of an inclined magnetic field and a partially heater on the right wall of the cavity have been analyzed in this research. Firstly, the governing equations along with precise boundary conditions have been transformed into dimensionless form, then the resulting non-linear partial differential equations (PDEs) have been solved using the finite element method with the Galerkin weighted residual approach. The computational outcomes are obtained for a variety of physical and governing parameters, such as solid volume fraction (δ), heater length (<em>HL</em>), Richardson number (<em>Ri</em>), Hartmann number (<em>Ha</em>), inclination of magnetic field (ϕ), and non-dimensional time (τ). The simulation results show that the aforementioned parameters significantly affect the temperature distribution, flow pattern, average fluid temperature (θ<sub><em>av</em></sub>) inside the cavity, and average Nusselt number (<em>Nu<sub>av</sub></em>) at the heated surface. Optimization and sensitivity of the parameters namely solid volume fraction (δ), Richardson number (<em>Ri</em>), and Hartmann number (<em>Ha</em>) have been performed by using the response surface methodology, which entails creating a correlation equation that connects input variables to output responses to improve <em>Nu<sub>av</sub></em> for better heat transfer efficiency. Variations in the Richardson number (<em>Ri</em>) and solid volume fraction (<em>δ</em>) have a significant impact on the heat transfer rate, contrary to the findings. In addition, nanofluid's flow behavior is notably influenced by the magnetic field and its orientation. Furthermore, the heat transfer rate increases by 18.23 % as the solid volume fraction, <em>δ</em>, enhances from 0.001 to 0.03 and by 68.22 % as the heater length, <em>HL</em>, rises from 0.1 to 0.5. However, as the Hartmann number rises from 0 to 100, the average heat transfer across the cavity decreases by 17.46 %. Additionally, the <em>Nu<sub>av</sub></em> inside the cavity is positively sensitive to Richardson number (<em>Ri</em>) and solid volume fraction (δ), whereas negatively sensitive to Hartmann's number (<em>Ha</em>).</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"27 ","pages":"Article 101197"},"PeriodicalIF":0.0,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143785923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thermodynamic design and assessment of a self-powered plant using integrated solar and biomass system with energy storage solutions 采用太阳能和生物质能系统及储能解决方案的自供电电厂热力设计与评估
International Journal of Thermofluids Pub Date : 2025-04-01 DOI: 10.1016/j.ijft.2025.101201
Ayse Sinem Meke, Ibrahim Dincer
{"title":"Thermodynamic design and assessment of a self-powered plant using integrated solar and biomass system with energy storage solutions","authors":"Ayse Sinem Meke,&nbsp;Ibrahim Dincer","doi":"10.1016/j.ijft.2025.101201","DOIUrl":"10.1016/j.ijft.2025.101201","url":null,"abstract":"<div><div>This study develops a solar-powered energy system that integrates a solar tower, multistage gas turbines, an Organic Rankine Cycle (ORC), biomass and plastic gasification subsystems, and Compressed Air Energy Storage (CAES) and evaluates its performance. The present system is then assessed by considering thermodynamic, economic and environmental aspects, highlighting its efficiency in waste biomass and plastic utilization for energy conversion while minimizing exergy losses. The system achieves an annual AC energy production of 41,304,708 kWh, with an overall energy efficiency of 31 % and exergy efficiency of 53 %, highlighting its effective energy recovery and utilization. The biomass and plastic gasification subsystem stand out with 61 % energy efficiency, showcasing its capability to efficiently convert organic and synthetic waste into usable energy. Additionally, the CAES subsystem provides excellent energy storage and peak power delivery, enhancing system flexibility and reliability. The solar tower subsystem contributes significantly by harnessing solar energy, reflecting the systems strong alignment with renewable energy goals. A sustainability assessment is also conducted, to study some aspects of energy, exergy, and resource utilization efficiency to support a long-term environmental viability. Economically, the system demonstrates the potential for further cost optimization and scalability as technologies mature, with strategic improvements in key components expected to enhance long-term financial sustainability. The present system is further considered for potential implementation in the city of Isparta, Turkey, a region well suited for solar energy production and biomass utilization, providing a location-specific approach to optimizing renewable energy integration.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"27 ","pages":"Article 101201"},"PeriodicalIF":0.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807198","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A comprehensive analysis of the nitrogen expansion process for liquefied natural gas industry from the operational point of view 从操作角度对液化天然气工业氮气膨胀工艺进行了综合分析
International Journal of Thermofluids Pub Date : 2025-04-01 DOI: 10.1016/j.ijft.2025.101200
Mohammad Mahdi Jourablou , Mohsen Salimi , Majid Amidpour
{"title":"A comprehensive analysis of the nitrogen expansion process for liquefied natural gas industry from the operational point of view","authors":"Mohammad Mahdi Jourablou ,&nbsp;Mohsen Salimi ,&nbsp;Majid Amidpour","doi":"10.1016/j.ijft.2025.101200","DOIUrl":"10.1016/j.ijft.2025.101200","url":null,"abstract":"<div><div>One of the significant challenges faced by operators of Liquefied natural gas (LNG) units is maintaining production capacity under various and often challenging conditions. Liquefied natural gas (LNG) units, characterized as energy intensive units, are significantly affected by seasonal variations and the quality of feed gas, which are crucial for their strategic product output. This study employs thermodynamic principles, exergy analysis, and sensitivity analysis of a nitrogen expansion process, optimizing production capacity through a detailed operational assessment. A novel approach is introduced, categorizing cooling capacity into internal and ambient components to establish an optimal balance. Plant optimization, constrained by equipment limitations, effectively mitigates issues associated with conventional methods. Exergy analysis reveals that the cooling section of the gas post-compressor is a major contributor to exergy destruction, accounting for approximately 60 % of the total irreversibility in the system. The analysis also highlights that air-coolers have an irreversibility rate about 30 % higher than water-cooling systems. Sensitivity analysis demonstrates the impact of ambient temperature and feed gas pressure on production capacity. LNG production shows stability within a temperature range of 5–15 °C, but significant declines occur at temperatures exceeding 15 °C. Additionally, a severe reduction in output is observed when feed gas pressure drops below 30 bar.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"27 ","pages":"Article 101200"},"PeriodicalIF":0.0,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143786046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Exploring entropy production in metachronal wave motion of Carreau fluid in a channel under lubrication hypothesis 在润滑假设下探讨卡罗流体在通道中变向波动的熵产
International Journal of Thermofluids Pub Date : 2025-03-31 DOI: 10.1016/j.ijft.2025.101198
Muhammad Yousuf Rafiq, Zaheer Abbas, Farah Munawar, M. Mujahid, Anum Durrani
{"title":"Exploring entropy production in metachronal wave motion of Carreau fluid in a channel under lubrication hypothesis","authors":"Muhammad Yousuf Rafiq,&nbsp;Zaheer Abbas,&nbsp;Farah Munawar,&nbsp;M. Mujahid,&nbsp;Anum Durrani","doi":"10.1016/j.ijft.2025.101198","DOIUrl":"10.1016/j.ijft.2025.101198","url":null,"abstract":"<div><div>The energy loss associated with the beating of cilia in the human stomach, leading to acidity in the blood flow under certain conditions, has become a critical topic in modern medical research. This study investigates entropy generation in the flow of cilia-generated metachronal waves of Carreau fluid through a channel, incorporating the effects of viscous dissipation and an externally applied magnetic field. The flow is governed by metachronal wave propagation along the ciliated channel walls. Using the lubrication hypothesis, the governing equations are normalized and solved analytically via the integration technique. Graphical representations illustrate the impact of key physical parameters on the flow behavior, providing a deeper physical interpretation of the system dynamics. Special emphasis is placed on analyzing pumping efficiency and trapped bolus formation in Carreau fluid due to ciliary metachronism. The results indicate that fluid velocity increases with higher values of the power-law index parameter and eccentricity parameter. Additionally, fluid temperature rises with an increasing Brinkman number but decreases as the Weissenberg number increases. These findings offer valuable insights into the optimization of biomedical microfluidic devices, particularly in the design of magnetic micro-bots for targeted medical applications.</div></div>","PeriodicalId":36341,"journal":{"name":"International Journal of Thermofluids","volume":"27 ","pages":"Article 101198"},"PeriodicalIF":0.0,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143807197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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