Heat Transfer最新文献_第8页

Analytical Investigation on Flow Reversal in a Fully Developed Steady Mixed Convection Flow With Boundary Condition of the Third Kind

IF 2.8

Heat Transfer Pub Date : 2024-11-18 DOI: 10.1002/htj.23218

Basant K. Jha, Ayyub M. Hussaini, Muhammad M. Altine

引用次数: 0

Numerical Analysis of Micropolar Flow Along a Vertical Flat Plate in a Saturated Porous Medium Under Constant Heat Flux

IF 2.8

Heat Transfer Pub Date : 2024-11-15 DOI: 10.1002/htj.23227

Omar Quran, Hussein Maaitah, Mutaz Elyyan, Mohamad Y. Mustafa, Hamzeh M. Duwairi

{"title":"Numerical Analysis of Micropolar Flow Along a Vertical Flat Plate in a Saturated Porous Medium Under Constant Heat Flux","authors":"Omar Quran, Hussein Maaitah, Mutaz Elyyan, Mohamad Y. Mustafa, Hamzeh M. Duwairi","doi":"10.1002/htj.23227","DOIUrl":"https://doi.org/10.1002/htj.23227","url":null,"abstract":"<div>\u0000 \u0000 <p>The present study assesses the constant surface heat flux on a 2D steady convective flow of a micropolar fluid. The flow occurs along a vertical impermeable flat plate immersed in a fluid-saturated porous medium. Numerical methods are used to convert the governing partial differential equations to gather the locally equivalent ordinary differential equations. Local similarity solutions also visually depict the velocity distribution and microrotation (<i>ω</i>) in the boundary layer. Furthermore, the influence of the physical variables on the flow field is investigated. The numerical results show that the effect of porosity (<i>ε</i>) on the velocity profile demonstrates a negative correlation between <i>ε</i> and velocity. The correlation between microrotation (<i>ω</i>) involving the <i>ε</i> influence also depends on the similarity parameter (<i>η</i>). Although microrotation (<i>ω</i>) increases with porosity (<i>ε</i>) in the region where the fluid is near the surface, this trend changes as the flow moves further away from the surface. The dimensionless microrotation (<i>ω</i>) value remains constant, while rotation is not observed for the similarity parameter (<i>η</i>) values exceeding 4.5. The value of microrotation (<i>ω</i>) value is small for the similarity parameter (<i>η</i>) values in the interval (0 < <i>η</i> < 1.4). Nonetheless, the microrotation (<i>ω</i>) value is high for the similarity parameter (<i>η</i>) values up to <i>η</i> = 4.5. Therefore, the point at <i>η</i> = 1.4 represents a crucial point in the present study. The results of the present study have been validated, and the comparison with related articles showed an excellent matching between results. Outcomes from the current study are very beneficial to enhance the performance of solar panels by improving the cooling of such panels.</p>\u0000 </div>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 2","pages":"1320-1330"},"PeriodicalIF":2.8,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380573","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

Rheological Analysis of Thermally Radiative Hyperbolic Tangent Fluid Flow in a Curved Channel Driven by Metachronal Ciliary Waves

IF 2.8

Heat Transfer Pub Date : 2024-11-14 DOI: 10.1002/htj.23222

Z. Abbas, Moin-ud-Din Junjua, M. S. Arslan, S. Khaliq, M. Y. Rafiq

{"title":"Rheological Analysis of Thermally Radiative Hyperbolic Tangent Fluid Flow in a Curved Channel Driven by Metachronal Ciliary Waves","authors":"Z. Abbas, Moin-ud-Din Junjua, M. S. Arslan, S. Khaliq, M. Y. Rafiq","doi":"10.1002/htj.23222","DOIUrl":"https://doi.org/10.1002/htj.23222","url":null,"abstract":"<div>\u0000 \u0000 <p>The study and application of cilia flow have implications across a wide range of disciplines, from medicine and biology to engineering and robotics, contributing to advancements in healthcare, biotechnology, and fluid dynamics research. Motivated by these applications, a numerical simulation is performed to investigate the mixed convective cilia flow of MHD hyperbolic tangent fluid in a curved channel. The analysis is performed in the presence of viscous dissipation. The curvilinear coordinates are used due to the curved nature of flow geometry in the derivation of flow equations. The fluid motion arises from the metachronal waves generated by the cilia. The constitutive equations are simplified by the hypothesis of the lubrication approximation and then solved numerically using the Keller Box method. Comprehensive investigation of velocity, temperature, pumping phenomena, streamlines, skin friction, and Nusselt number are graphed and analyzed. The results obtained from the analysis convey that the fluid velocity decreases with an increase in the magnetic field and increases with a rise in the Weissenberg number. The Nusselt number increases with the Brinkman number while the reverse observations are predicted for curvature parameter. Streamlines show fluid movement driven by cilia oscillations. Furthermore, the skin friction and Nusselt number at the channel walls are determined for a variety of critical parameter assessments. Potential applications of the current work include mucus clearance from the respiratory tract, microfluidics, oesophageal transport, biofluid mechanisms, and other fields of physiology.</p>\u0000 </div>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 2","pages":"1281-1292"},"PeriodicalIF":2.8,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380689","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

3D MHD Natural Convective Flow Past a Uniformly Moving Porous Vertical Plate With Variable Sinusoidal Suction in the Slip Flow Regime

IF 2.8

Heat Transfer Pub Date : 2024-11-14 DOI: 10.1002/htj.23229

Nazibuddin Ahmed, Masuma Khanam

{"title":"3D MHD Natural Convective Flow Past a Uniformly Moving Porous Vertical Plate With Variable Sinusoidal Suction in the Slip Flow Regime","authors":"Nazibuddin Ahmed, Masuma Khanam","doi":"10.1002/htj.23229","DOIUrl":"https://doi.org/10.1002/htj.23229","url":null,"abstract":"<div>\u0000 \u0000 <p>The current study aims to precisely solve the problem of three-dimensional (3D) magnetohydrodynamics (MHDs) natural convective flow of a viscous, incompressible, electrically conducting, nongray, optically thick fluid past a uniformly moving porous vertical plate with variable sinusoidal suction in the slip flow regime, considering thermal diffusion, diffusion-thermo, and thermal radiation. The incorporation of variable sinusoidal suction with variable amplitude in a slip flow regime in 3D MHD natural convective flow across a uniformly moving porous vertical plate is the novelty of the present work. Into the fluid region, a uniform transverse magnetic field is applied. Using Rosseland approximation, the flux appearing in the energy equation can be described. At the plate, solutal, thermal, and momentum slip are taken into account. The equations governing the flow model are solved using the asymptotic series expansion method. Since sinusoidal suction creates a 3D flow, the flow is 3D. Through figures and tables, we discuss the effects of different parameters on flow and transport characteristics. The magnetic body force, or Lorentz force, is produced when a magnetic field and fluid velocity interact. Because of this force's resistance to the flow, the fluid's velocity drops. A greater amount of mass diffusivity results in an increase in the concentration profile. An increase in thermal diffusivity raises the temperature field. The rate of heat transmission is reduced by higher thermal diffusivity. The mass transfer accelerates as fluid viscosity rises because the fluid's viscosity increases along with the Schmidt number. Skin friction reduces by 0.5% when the Soret number rises by one unit. The rate of mass transfer is enhanced with a growing Reynolds number or low viscosity.</p>\u0000 </div>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 2","pages":"1293-1308"},"PeriodicalIF":2.8,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380690","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

Numerical Study of Fluid Flow and Heat Transfer in Rectangular Microchannel Equipped With Hollow Hemispheres

IF 2.8

Heat Transfer Pub Date : 2024-11-14 DOI: 10.1002/htj.23233

Belkacemi Zoubir, Belhani Latifa

引用次数: 0

Modeling of Heat Transfer and Airflow Inside Evacuated Tube Collector With Heat Storage Media: Experimental Validation Powered by Artificial Neural Network

IF 2.8

Heat Transfer Pub Date : 2024-11-11 DOI: 10.1002/htj.23215

Amr Elbrashy, Abdelrahman Elgohr, Abdullah Elshennawy, Maher Rashad, Magda El-fakharany

{"title":"Modeling of Heat Transfer and Airflow Inside Evacuated Tube Collector With Heat Storage Media: Experimental Validation Powered by Artificial Neural Network","authors":"Amr Elbrashy, Abdelrahman Elgohr, Abdullah Elshennawy, Maher Rashad, Magda El-fakharany","doi":"10.1002/htj.23215","DOIUrl":"https://doi.org/10.1002/htj.23215","url":null,"abstract":"<div>\u0000 \u0000 <p>Solar air heater (SAH) is a widely employed technology for harnessing solar thermal energy in numerous applications. Contemporary research optimizes designs within identical spatial constraints to maximize energy output. However, there is a recognized need to conduct analytical validation to stimulate the experimental setup and formulate an artificial neural network (ANN) model to govern and predict the operation system. This investigation involved developing and assessing an evacuated tube solar air heater (ETSAH) integrated with annulus-filled heat storage media. Furthermore, this study introduced an ANN model and analytical solution to predict performance parameters, representing a noteworthy contribution. The proposed ANN model achieved its optimal validation performance with a mean square error of 5.4018 × 10<sup>−6</sup> after 11 epochs within 31 of training. Also, correlation findings show that the optimal architecture of a feed-forward backpropagation is achieved when the 5-40-40-40-2 model architecture is used. In this case, there are five neural nodes in the input layer that represent timing, temperature, radiation, and airflow rate. The power output of the ETSAH device shows a strong correlation with the flow rate, reaching its peak at 0.05 kg/s with a value of 2261 W and dropping to 368 W at 0.006 kg/s. Correspondingly, the greatest energy efficiency was measured at airflow rates of 0.05, 0.01, and 0.006 kg/s, accounting for 48.38%, 27.32%, and 19.65%, respectively.</p>\u0000 </div>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 2","pages":"1217-1231"},"PeriodicalIF":2.8,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380901","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 Thermal Performance by Enhancing Natural Convection of Diverse Configurations of Fin Heat Sink Filled With Nano-Enhanced Phase Change Materials: A Numerical Study

IF 2.8

Heat Transfer Pub Date : 2024-11-11 DOI: 10.1002/htj.23230

Mallik Nadim Arman Omi

{"title":"Optimization of Thermal Performance by Enhancing Natural Convection of Diverse Configurations of Fin Heat Sink Filled With Nano-Enhanced Phase Change Materials: A Numerical Study","authors":"Mallik Nadim Arman Omi","doi":"10.1002/htj.23230","DOIUrl":"https://doi.org/10.1002/htj.23230","url":null,"abstract":"<div>\u0000 \u0000 <p>Electronic components require faster propagation of heat to prevent overheating as well as to maintain a stable operating condition. Incorporating phase change materials (PCMs) in fin heat sinks (FHSs) can be a viable solution to enhance natural convection. In the present work, an extensive investigation has been carried out on three types (square, circular, and triangular) of FHSs filled with PCMs to find the best combinations for the thermal cooling of a heat sink. To increase the thermal conductivity of the PCMs, Cu–water nanofluid is added. The effects of three types (paraffin wax, stearic acid, and polyethylene glycol) of PCMs have been studied. Nondimensional equations have been solved numerically by using Galerkin's finite element method. A parametric investigation has been conducted by varying the Rayleigh number within the range of 10<sup>3</sup>–10<sup>6</sup> to calculate the Nusselt number. Results reveal that a heat sink with PCMs can reduce the temperature rise by 6.41% and increase the Nusselt number by 4.6% compared to a heat sink without PCMs. As the height of the fins increases from 10 to 16 mm, thermal efficiency increases. Moreover, square FHSs show the best thermal performance by reducing the temperature rise by as much as 13.41% compared to circular and triangular FHSs. Therefore, this comparative study shows that the dimensional configurations of FHSs with varying PCMs have a great impact on thermal performance and thus provide one the opportunity to obtain an effective arrangement of heat sinks.</p>\u0000 </div>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 2","pages":"1267-1280"},"PeriodicalIF":2.8,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380904","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 Analysis of Heat Exchanger Models for Phase Change Material Melting Process: Experimental and Numerical Investigation

IF 2.8

Heat Transfer Pub Date : 2024-11-11 DOI: 10.1002/htj.23217

Hussein Hatem Saleh, Munther Abdullah Mussa

{"title":"Comparative Analysis of Heat Exchanger Models for Phase Change Material Melting Process: Experimental and Numerical Investigation","authors":"Hussein Hatem Saleh, Munther Abdullah Mussa","doi":"10.1002/htj.23217","DOIUrl":"https://doi.org/10.1002/htj.23217","url":null,"abstract":"<div>\u0000 \u0000 <p>Thermal energy storage systems using PCM offer promising solutions for efficient thermal applications. This study aims to provide valuable insights into the PCM melting process and compare the thermal performance of different heat exchanger models. The experimental rig is carefully designed to simulate a shell and tube heat exchanger with five longitudinal copper fins at specific conditions. Three distinct models of the heat exchanger, labeled Models A, B, and C, were examined for their heat transfer efficiency during the melting process. Numerical simulations were conducted for the three models and compared with experimental results. Model A represented the benchmark model. It had uniform fin length, location, and angle. Model B was the modified design aimed at enhancing melting progress. These modifications included a longer lower fin, a shorter side fin compared to the reference, and a lower fin angle to optimize heat transfer performance. Model C incorporates further design modifications, with a longer lower fin, a shorter top fin, and different lower fin location. Numerical simulations and experimental observations revealed significant differences in heat transfer performance among the three models. The average heat transfer rates, measured up to the critical decline point, are crucial parameters for practical applications. A comparison among the three models showed that Model B surpassed the average heat transfer rate up to the critical point of Models A and C by 10% and 4%, respectively, demonstrating its superior practical applicability.</p>\u0000 </div>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 2","pages":"1232-1251"},"PeriodicalIF":2.8,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380902","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

Numerical Investigation of Pyramid Solar Stills with PCM-Nanoparticles and Absorber Fins: Enhanced Thermal Performance for Sustainable Water Desalination

IF 2.8

Heat Transfer Pub Date : 2024-11-11 DOI: 10.1002/htj.23223

Angham Fadil Abed, Mohammed J. Alshukri, Ahmed Mohsin Alsayah, Rassol Hamed Rasheed, Mahmoud Khaled

{"title":"Numerical Investigation of Pyramid Solar Stills with PCM-Nanoparticles and Absorber Fins: Enhanced Thermal Performance for Sustainable Water Desalination","authors":"Angham Fadil Abed, Mohammed J. Alshukri, Ahmed Mohsin Alsayah, Rassol Hamed Rasheed, Mahmoud Khaled","doi":"10.1002/htj.23223","DOIUrl":"https://doi.org/10.1002/htj.23223","url":null,"abstract":"<div>\u0000 \u0000 <p>In arid regions facing challenges of limited access to potable water and electricity, solar desalination stands out as a promising solution for producing clean water from brackish sources. This research intends to examine and enhance an innovative and sustainable solar desalination system. A computational study is conducted on a pyramid solar still (PSS) combined with a phase-change material incorporated with nanoparticles, with a variety of absorber fins. The study investigates three configurations: a traditional pyramid–shaped solar still, one with square absorber fins, and another with circular fins. Paraffin wax mixed with Al<sub>2</sub>O<sub>3</sub> nanoparticles is used beneath the absorber fins. Conservation equations are solved using COMSOL Multiphysics. Simulation outcomes demonstrate that the incorporation of finned absorbers, coupled with elevated water temperatures, significantly enhances the yield of the improved PSS compared with its conventional counterpart. The square-finned absorber PSS exhibits a substantial increase in total accumulated productivity over the conventional design. Moreover, the PSS with square-finned absorbers demonstrates an impressive average peak daily thermal efficiency improvement of 49.19% compared with a conventional solar still. This study highlights the effectiveness of the modified PSS as a superior option for household water generation.</p>\u0000 </div>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 2","pages":"1252-1266"},"PeriodicalIF":2.8,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380903","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

Energy Efficiency and Economic Survivance Appraisal of a 375 kWp Rooftop Solar PV System Under Hot and Dry Indian Climate

IF 2.8

Heat Transfer Pub Date : 2024-11-08 DOI: 10.1002/htj.23228

Surendra Poonia, Priyabrata Santra, A. K. Singh, Digvijay Singh, Mahesh Kumar

{"title":"Energy Efficiency and Economic Survivance Appraisal of a 375 kWp Rooftop Solar PV System Under Hot and Dry Indian Climate","authors":"Surendra Poonia, Priyabrata Santra, A. K. Singh, Digvijay Singh, Mahesh Kumar","doi":"10.1002/htj.23228","DOIUrl":"https://doi.org/10.1002/htj.23228","url":null,"abstract":"<div>\u0000 \u0000 <p>India's rooftop solar photovoltaic (PV) installations are experiencing rapid growth due to favorable regulations. As climate change becomes a growing concern, researchers are turning their attention to the effects of weather patterns on the performance of rooftop solar panels, and also to optimize their efficiency in a changing environment. Consequently, industry players in the solar sector have been conducting performance validation and feasibility assessments of these plants. A 375 kWp rooftop PV plant is studied as a case example from April 1, 2022 to March 31, 2023, generating 543,666 kWh annually for the grid. The NMBE and MBE were assessed using simulation tools like PVGIS and PV Watts. In addition, a cost–benefit analysis of carbon credits was conducted with and without their inclusion. The energy payback time is calculated at 4.5 years post-inclusion. Over a 25-year lifespan, the embodied energy of the PV plant amounts to 2,552,265 kWh. This plant can mitigate CO<sub>2</sub> emissions annually by 10,173.57 tons which is equivalent to INR 5,464,925. The current study highlights both environmental and economic benefits by incorporating carbon credits into the project. Further advancement in simulation tools, PV technologies, climate change adaptations are expected which will improve the rooftop system efficiency with shorten pay pabck periods and maximum reductions in CO<sub>2</sub> emissions.</p>\u0000 </div>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 2","pages":"1202-1216"},"PeriodicalIF":2.8,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143380273","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