International Communications in Heat and Mass Transfer最新文献

{"title":"Linear and nonlinear study of thermal instability in a fluid layer with general hydrodynamic boundaries under gravity variations","authors":"Deepti Surya","doi":"10.1016/j.icheatmasstransfer.2025.109016","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109016","url":null,"abstract":"<div><div>This study investigates the impact of changing gravity on the onset of thermal instability in a horizontal liquid layer heated from below and trapped between thermally conducting, general hydrodynamic boundaries (permeable). Both linear and nonlinear analysis are employed to examine the instability and stability of the system. The numerical results from both linear and nonlinear techniques are compared to determine the subcritical region. Chandrasekhar’s method is utilized to examine the impact of different physical parameters on the system’s stability. The principle of exchange of stabilities (PES) is verified for general hydrodynamic boundaries and is numerically shown to be violated as gravity decreases upward. A comprehensive parametric analysis reveals that as the gravity and permeability parameters increase, the critical Rayleigh number initially rises, indicating a stabilizing effect. Also, Stability curves depicting the interplay between gravity and permeability are presented graphically. However, for sufficiently large gravity values, gravity reversal alters the stability conditions, leading to the emergence of an alternative instability mechanism. This transition marks a fundamental shift in system behavior and underscores the limitations of traditional stability analysis under extreme gravity variations. These findings offer novel insights into convection dynamics and contribute to the broader understanding of stability in variable-gravity environments.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"165 ","pages":"Article 109016"},"PeriodicalIF":6.4,"publicationDate":"2025-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144071534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A novel two-phase numerical model for evaluating thermal crisis in the absorber tube of a parabolic trough collector for direct steam generation","authors":"Antonio Cristaudo ,&nbsp;Piero Bevilacqua ,&nbsp;Pietropaolo Morrone ,&nbsp;Roberto Bruno ,&nbsp;Vittorio Ferraro","doi":"10.1016/j.icheatmasstransfer.2025.109049","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109049","url":null,"abstract":"<div><div>In line with the need for further decarbonization of electricity production and to promote the use of renewable energy sources, this article proposes a steady-state quasi 2-D homogeneous equilibrium model for a parabolic trough collector (PTC) intended for steam generation within a Rankine cycle. The thermal behaviour of the collector has been modelled considering that the heat transfer fluid (HTF) enters the absorber as subcooled liquid, reaches saturation temperature, and then undergoes phase change. No models are currently available that can predict the onset of the film dryout phenomenon and accurately simulate heat transfer under this flow regime. In this work the two-phase region has been modelled by assuming an annular flow regime, followed by a possible dispersed droplet flow pattern, to describe the thermal behaviour of the collector even under thermal crisis conditions. Furthermore, the model allows for the determination of the internal characteristics of the absorber to identify the static stability conditions of the collector. The thermal model was validated using experimental data from the Direct Solar Steam Test Facility at the Almeria platform (Spain). A case study of a PTC operating in a direct steam generation (DSG) system has been analyzed, and a parametric analysis was conducted by varying the main operating parameters (Direct Normal Irradiance, HTF mass flow rate, and absorber length) to assess the effect of dryout on the energy performance of the collector. The results show that the efficiency ranges between 72.9 % and 66.5 %, and furthermore, highlight that, within the range of thermal fluxes typical of solar applications, the onset of a thermal crisis does not lead to destructive phenomena. In fact, although the wall temperature increases suddenly, the values reached are contained, allowing the absorber to work safely.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"165 ","pages":"Article 109049"},"PeriodicalIF":6.4,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068651","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evolution of gas seepage properties in shale fractures under different confining pressure and temperature conditions","authors":"Haichun Ma ,&nbsp;Peng Zhou ,&nbsp;Jiazhong Qian ,&nbsp;Yaping Deng ,&nbsp;Yunfeng Shi ,&nbsp;Bing Lian","doi":"10.1016/j.icheatmasstransfer.2025.109039","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109039","url":null,"abstract":"<div><div>This study investigated the impact of temperature and confining pressure on the seepage behavior of rock fractures. Through a combination of theoretical analysis and numerical simulations, a novel coupling model that integrates the interdependent effects of confining pressure, temperature, and gas seepage in fractures has been proposed and validated. The coupling nature of these factors is characterized by their synergistic interactions: confining pressure directly influences the fracture aperture, which in turn affects fluid flow dynamics, while temperature alters the gas viscosity and further modifying the seepage behavior. The results indicate: An increase in confining pressure diminishes the fracture mechanical aperture, leading to enhanced biased fluidity and inertia forces. When the confining pressure rises from 0.565 to 0.916 MPa, biased fluidity escalates by 19 %, seepage resistance surges by 44 %, and the permeability coefficient diminishes by 23 %–27 %. When the temperature rises from 293.15 to 373.15 K, seepage resistance to augment by 20 %, and the permeability coefficient to decline by 14 %–19 %. The proposed theoretical model, which uniquely accounts for the coupled thermo-hydro-mechanical interactions and not only offers insights into the interactions between geological conditions and fluid mechanics in fractured shale environments but also provides a new ideas for the improvement of existing models.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"165 ","pages":"Article 109039"},"PeriodicalIF":6.4,"publicationDate":"2025-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144068650","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated optimization of flow patterns and heat transfer in horizontal rotating channel based on response surface method","authors":"Haozeng Guo ,&nbsp;Jixian Dong ,&nbsp;Sha Wang ,&nbsp;Lijie Qiao ,&nbsp;Bo Wang ,&nbsp;Huan Liu","doi":"10.1016/j.icheatmasstransfer.2025.109090","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109090","url":null,"abstract":"<div><div>Horizontal rotating channel is used in multi-channel cylinder dryer and other heat transfer equipment, which can greatly improve the heat transfer performance, and has very important research value. In order to investigate the relationship between flow patterns, heat transfer coefficients and other parameters in the horizontal rotating channel, response surface analysis was innovatively used in this experiment, and the response surface equation was also constructed. The Nusselt number response surfaces for different flow patterns were obtained by polynomial fitting. The results show that the rotation has a greater effect on the heat transfer and flow pattern of the horizontal channel, and a higher rotating speed will reduce or homogenize the fluctuation of the distribution of heat transfer coefficients along the flow direction while hindering the flow heat transfer, so that the overall heat transfer performance will be more uniform. Response surface analysis obtained a theoretical maximum value of ln<em>Nu</em> of 11.79 for all flow patterns in the case of atomized flow. At the same time, in order to achieve the best overall heat transfer performance, the mass flow rate of steam and the setting temperature should be at least as high as possible, while trying to maintain a low rotating speed.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"165 ","pages":"Article 109090"},"PeriodicalIF":6.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947176","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anodizing in H2SO4/NH4F mixture for superhydrophobic surfaces with anti-icing, wear-resistant, and self-cleaning properties","authors":"Shou-Yi Li,&nbsp;Yi-Xue Ma,&nbsp;Wen-Bin Cai","doi":"10.1016/j.icheatmasstransfer.2025.109071","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109071","url":null,"abstract":"<div><div>The superhydrophobic micro/nano TiO₂ surface was successfully fabricated on a titanium plate through the processes of anodic oxidation and stearic acid modification. By precisely adjusting the parameters of anodic oxidation voltage and time, various structures such as nanopores, protrusions, and flower-like structures can be effectively engineered on the surface of TiO₂. Furthermore, the impact of oxidation voltage and time on the CA and SA of the TiO₂ surface was investigated. The findings demonstrate that both voltage and time exert a significant influence on the CA and SA, with a maximum value reaching ∼161.5° and a SA approaching 0°. Importantly, even after prolonged oxidation for 810 min at 50 V, the CA remains at ∼154.6°. The TiO₂ surface remains in a frozen state at extremely low temperatures (as low as −16 °C) for a specific duration, and upon exposure to room temperature, it successfully restores its superhydrophobic properties. Additionally, it exhibits excellent resistance against icing formation while demonstrating remarkably low adhesion and highly effective self-cleaning capabilities, and superior wear resistance.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"165 ","pages":"Article 109071"},"PeriodicalIF":6.4,"publicationDate":"2025-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental and numerical study on smoke bifurcation in L-shaped passage fire under stack effect","authors":"Zekun Li ,&nbsp;Miaocheng Weng ,&nbsp;Fang Liu","doi":"10.1016/j.icheatmasstransfer.2025.109075","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109075","url":null,"abstract":"<div><div>The L-shaped passage, widely used in subway entrances, mine laneways, and stairwells of high-rise buildings, is a confined corridor consisting of an inclined section and a horizontal section. Fires in L-shaped passages generate significant stack effect, leading to bifurcation phenomena in smoke flow within the passage. This study employs FDS software to numerically simulate smoke flow during fire incidents in L-shaped passages, investigating the effects of heat release rate (HRR), passage cross-sectional area, length of inclined segments, inclination angle, and ratio of horizontal to inclined segment lengths on stack effect and smoke bifurcation. The results indicate that passage height minimally affects smoke bifurcation, while HRR, passage width, length of inclined segments, and inclination angle significantly influence both the stack effect and the location of smoke bifurcation. Additionally, predictive expressions for the Froude number under different structural characteristics of L-shaped passages are proposed, along with criteria for evaluating smoke bifurcation phenomena under stack effect, as well as determining the location of maximum smoke temperature rise and smoke bifurcation. The findings provide valuable references for ventilation and smoke extraction design in buildings with similar structures.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"165 ","pages":"Article 109075"},"PeriodicalIF":6.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Low-order diffusive heat and mass transfer model for convective–radiative heating of a wet brick during energy investigation of an electric oven: Static mode","authors":"Aniket D. Monde","doi":"10.1016/j.icheatmasstransfer.2025.109002","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109002","url":null,"abstract":"<div><div>Electric ovens typically belong to the low-efficiency category among electric appliances, exhibiting efficiencies typically ranging from 10% to 12%. To enhance efficiency, the home appliance industry focuses primarily on integrating advanced technologies. The energy efficiency index (EEI) for these appliances is in accordance with the testing standards specified in the EN 60350-1 standard. During testing, a standard wet brick inside the oven undergoes controlled heating from its initial temperature to a specified level, underscoring the need for precise modelling techniques. In this study, we propose a low-order dynamic model designed to predict the transient thermo-fluid behaviour of a domestic electric oven during energy consumption tests conducted in natural convective mode. This model accounts for simultaneous heat and mass transfer between the cavity air and the wet brick, employing a lumped model approach that optimizes computational efficiency. The oven is systematically divided into five subsystems: door, cavity, ventilation, cabinet, and wet brick, modelled using fundamental equations. Boundary conditions are calibrated using empirical correlations derived from experimental data, imparting a grey-box characterization to the system. Model parameters are meticulously tuned and calibrated based on available physical data. Following calibration, the model undergoes verification against additional experimental data to ensure its accuracy. The model effectively predicts transient variables such as cavity wall temperature, brick core temperature, and ventilation flows well within permissible error margins. Furthermore, it forecasts oven energy consumption, brick heating duration, and water evaporation, all within acceptable error limits of 15%. This comprehensive approach not only enhances our understanding of oven performance dynamics but also contributes to optimizing energy efficiency in domestic electric appliances.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"165 ","pages":"Article 109002"},"PeriodicalIF":6.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947178","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Electrohydrodynamic crystalline anisotropic solidification based on a hybrid lattice Boltzmann model","authors":"Yinnan Zhang ,&nbsp;Vedad Dzanic ,&nbsp;Jiachen Zhao ,&nbsp;Zhihao Qian ,&nbsp;Runze Sun ,&nbsp;Haifei Zhan ,&nbsp;Yuantong Gu ,&nbsp;Emilie Sauret ,&nbsp;Chaofeng Lü","doi":"10.1016/j.icheatmasstransfer.2025.109059","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109059","url":null,"abstract":"<div><div>Electrohydrodynamics is an efficient approach to control the solidification process. While most studies focus on isotropic solidification, the effects of crystalline anisotropy on Electrohydrodynamics solidification remain unexplored. This study uses numerical simulations based on a hybrid lattice Boltzmann method to examine the effects of varying electric field strengths and physical properties on electrohydrodynamic crystalline anisotropic solidification, focusing on dendrite growth rate and solid-liquid interface morphology. It is found that large electrical Rayleigh numbers enhance flow motion, sharpening the upstream concentration gradient, and promoting frontal branch growth while suppressing lateral growth. Material properties, including the diffusion coefficient ratio and ionic mobility ratio, significantly affect the local solid-liquid interface morphology by modifying electric charge transport. Low diffusion coefficient ratios lead to multiple vortices, while higher ones result in simpler flow structures. Ionic mobility ratio controls the interfacial charge gradient. When the solid phase exhibits higher ionic mobility than the liquid, interfacial charge accumulation induces flow motion, triggering the Mullins-Sekerka instability. In directional solidification, the ionic mobility ratio influences the onset of the interface Mullins-Sekerka instability, while the electric strength enhances competition among dendritic tips. These results provide an avenue for the application of electrohydrodynamics in the smart control of material manufacture.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"165 ","pages":"Article 109059"},"PeriodicalIF":6.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis and optimization on flow and heat transfer characteristics of twisted oval shell-and-tube heat exchangers based on numerical simulation and model prediction","authors":"Xuwei Zhu ,&nbsp;Qiutong Lu ,&nbsp;Qingwen Xue ,&nbsp;Yuanda Cheng ,&nbsp;Xiangxiang Jiao ,&nbsp;Huaping Wang","doi":"10.1016/j.icheatmasstransfer.2025.109077","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109077","url":null,"abstract":"<div><div>Conventional shell-and-tube heat exchangers face substantial limitations in improving thermal efficiency. To address this, a novel shell-and-tube heat exchanger design incorporating twisted oval tubes in place of conventional round tubes is proposed. This study examines the effects of twisted pitch length and shell-side Reynolds number on the heat transfer and flow characteristics of the twisted oval tube shell-and-tube heat exchanger with baffles. The optimization of input variables was performed using a quadratic polynomial model and an artificial neural network model. The findings demonstrate that compared to the round shell-and-tube heat exchanger with baffles, the heat transfer coefficient of the twisted oval shell-and-tube heat exchanger with baffle increases by 15.9 % and the pressure drop decreases by 28.9 %. The heat transfer coefficient decreases with increasing twisted pitch length, with the most significant reduction of 5.7 % observed as twisted pitch length increased from 60 mm to 90 mm. Conversely, the heat transfer coefficient increases markedly with higher Reynolds number. The pressure drop rises substantially with increasing Reynolds number but decreases with higher twisted pitch length. The ratio of heat transfer coefficient to pressure drop declines with increasing Reynolds number, albeit at a diminishing rate, while the influence of twisted pitch length on the ratio of heat transfer coefficient to pressure drop is less pronounced compared to Reynolds number. When the twisted pitch length was 60 mm and the Reynolds number increased from 3167 to 5588, the ratio of heat transfer coefficient to pressure drop decreased from 1.61 to 0.46 W/m²·K·Pa, representing the maximum decline. The interactions between twisted pitch length and Reynolds number significantly affect heat transfer coefficient and pressure drop. Both predictive models demonstrate high accuracy, with the artificial neural network model outperforming the quadratic polynomial model, particularly in predicting pressure drop. The artificial neural network and quadratic polynomial models also exhibit greater sensitivity to heat transfer coefficient than to pressure drop, with discrepancies in predictive accuracy being more evident for pressure drop.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"165 ","pages":"Article 109077"},"PeriodicalIF":6.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143948207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"AI-driven modeling of bioconvective nanofluid flow: An ANN approach to anisotropic slip and heat transfer in 3D systems","authors":"Mehdi Mahboobtosi ,&nbsp;Hesam Ehsani ,&nbsp;Ali Mirzagoli Ganji ,&nbsp;Payam Jalili ,&nbsp;Mohamed H. Mohamed ,&nbsp;Bahram Jalili ,&nbsp;Davood Domiri Ganji","doi":"10.1016/j.icheatmasstransfer.2025.109035","DOIUrl":"10.1016/j.icheatmasstransfer.2025.109035","url":null,"abstract":"<div><div>Understanding the dynamics of nanofluids with microorganisms is crucial for biotechnology and thermal engineering applications, as they significantly influence heat and mass transfer processes. This study aims to analyze the behavior of nanofluids containing microorganisms over a three-dimensional moving surface, incorporating the effects of bioconvection, anisotropic slip, and convective boundary conditions. The governing equations are transformed into ordinary differential equations using similarity variables and solved numerically. Additionally, an Artificial Neural Network (ANN) is trained on numerical simulation data to develop a predictive model, enabling rapid and accurate predictions without the need for computational simulations. The results indicate that increasing the Prandtl number (<em>Pr</em>) from 3.2 to 6.2 leads to a 27.4 % reduction in the temperature profile (θ), while the concentration profile (φ) exhibits an inverse trend, increasing by 18.6 % within the boundary layer. Additionally, an increase in the Lewis number (<em>Le</em>) from 2 to 5 enhances thermal diffusivity, resulting in a 14.8 % increase in the thickness of the thermal boundary layer. The close agreement between numerical and ANN predictions validates the model's accuracy, demonstrating the effectiveness of machine learning in capturing complex fluid dynamics. These findings contribute to the optimization of heat and mass transfer processes in nanofluid applications, reducing computational costs while maintaining high precision.</div></div>","PeriodicalId":332,"journal":{"name":"International Communications in Heat and Mass Transfer","volume":"165 ","pages":"Article 109035"},"PeriodicalIF":6.4,"publicationDate":"2025-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143947632","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}