Heat Transfer最新文献

{"title":"An air-cooled cylindrical Li-ion 5 × 5 battery module with a novel flow-diverting arrangement and variable vent positions for electric vehicles: A numerical thermal analysis","authors":"Shweta Suryavanshi,&nbsp;P. M. Ghanegaonkar,&nbsp;Sagar Wankhede","doi":"10.1002/htj.23172","DOIUrl":"https://doi.org/10.1002/htj.23172","url":null,"abstract":"<p>Thermal management of lithium-ion batteries has received a lot of interest in the automobile sector. In commercial electric motor vehicles, an efficient battery cooling arrangement, particularly active cooling approaches, has been chosen as an ideal option. When building battery cooling systems, the physical structure and arrangement of the battery pack (BP) are vital. The current study presents a revolutionary design of a BP that incorporates cylindrical cells in a square duct and an air-cooling (AC) medium circulated in its surroundings with the help of variable vents for inlet and outlet. A forced-AC system is used to test lithium-ion battery cells grouped in a 5 × 5 configured battery module. To investigate the impact of heat generation on battery thermal performance, a complete thermal analysis was performed at different discharge rates of 0.5, 1, 2, 3, and 4 C. As compared with both inlet vents at an equidistance configuration with an inlet velocity of 12 m/s and a flow rate of 1.210(−2) kg/s, the results show that the proposed design minimizes heat accumulation by enhancing the heat transfer. As a result, the peak temperature and temperature disparity decreased by 6.76% and 85.32%, respectively. A flow-dispersing disc of 30 mm in size enhances temperature uniformity in comparison to the other intake vent design, hence improving battery safety and longevity.</p>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 1","pages":"203-222"},"PeriodicalIF":2.8,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860502","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}

{"title":"Thermal convection in a Brinkman–Darcy and Kelvin–Voigt fluid of order one with coupled stresses effect","authors":"Zaid Abbas Afluk,&nbsp;Akil J. Harfash","doi":"10.1002/htj.23165","DOIUrl":"https://doi.org/10.1002/htj.23165","url":null,"abstract":"<p>Our paper thoroughly examines a model for the thermal convection of specific viscoelastic fluids within a porous medium characterized by Brinkman–Darcy properties. These fluids demonstrate first-order Kelvin–Voigt behavior as they permeate the medium. This investigation considers the influence of couple stresses on the system. We calculate the critical Rayleigh number required for linear instability theory, focusing on both stationary and oscillatory types of convection. Additionally, we conduct the nonlinear stability theory. In the latter cases, it is demonstrated that oscillatory convection can occur. A detailed investigation is conducted into the characteristics of both stationary and oscillatory convection branches, including the points at which the transition occurs.</p>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 1","pages":"184-202"},"PeriodicalIF":2.8,"publicationDate":"2024-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860504","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}

{"title":"Weakly nonlinear instability analysis in triple-diffusive convection under gravity modulation in the presence of an internal heat generator","authors":"Atul Jakhar,&nbsp; Anurag,&nbsp;Anand Kumar","doi":"10.1002/htj.23170","DOIUrl":"https://doi.org/10.1002/htj.23170","url":null,"abstract":"<p>The presented study is prepared on the triple-diffusive convection (TDC) in the presence of an internal heat source to examine the rate of heat and mass transport. The weakly nonlinear instability analysis was used to show the effect of gravity modulation. Such phenomena have been found in space vehicle technology, wind turbines, geothermals, and many more. In the realm of geometry, our analysis encompasses the study of two parallel infinite horizontal plates with gravity in the downward direction. For TDC, we have considered two solutes. For the result validation, we have compared the critical Rayleigh number with the available research. The numerical outcomes are presented through graphs for different physical parameters. Based on the outcomes, we conclude that the Richardson, Prandtl, and Lewis numbers increase the mass and heat transport. The main finding of the present article is of the internal heat source that advances convection.</p>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 1","pages":"167-183"},"PeriodicalIF":2.8,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860237","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}

{"title":"Mathematical modeling of Newtonian/non-Newtonian fluids in a double-diffusive convective flow over a vertical wall","authors":"K. G. Chandan,&nbsp;B. Patil Mallikarjun,&nbsp;U. S. Mahabaleshwar,&nbsp;Basma Souayeh","doi":"10.1002/htj.23171","DOIUrl":"https://doi.org/10.1002/htj.23171","url":null,"abstract":"<p>This study implements the comparative study of Casson and Williamson nanofluids by considering the impacts of linear thermal radiation and inclined magnetohydrodynamics. Here, we employ graphs to compare the variables affecting the behavior of non-Newtonian and Newtonian fluids for a range of physical and dimensionless parameter values. The flow's coupled equations, which contain multiple independent variables, these equations can then be changed into a single independent variable by adding similarity variables and can be solved by applying the shooting method. The effects of thermomigration and Brownian motion on nonlinear flow equations are graphically examined. For an array of radiation parameter values, we have observed that the Newtonian fluid's concentration is lesser than that of both the non-Newtonian fluids and also noticed that Newtonian fluids converge a little sooner than Casson and Williamson fluids. The primary innovation is shown in Table 1, where the mass transfer and heat transfer values are contrasted with the limiting circumstances of previous research findings that are documented in the literature.</p>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 1","pages":"145-166"},"PeriodicalIF":2.8,"publicationDate":"2024-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860176","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}

{"title":"Numerical investigation of the impact of inlet and outlet ports of water jet impingement cooling modules","authors":"Noura Tarek,&nbsp;Mahmoud Nabil,&nbsp;Muhammed A. Hassan,&nbsp;Hatem Kayed","doi":"10.1002/htj.23168","DOIUrl":"https://doi.org/10.1002/htj.23168","url":null,"abstract":"<p>The ever-growing applications of high-power chips have driven research efforts to enhance the performance of their active cooling modules. This study proposes a simple tweak of the cooling module's ports for lower thermal resistance. A dual-inlet single-outlet (CP2) jet impingement cold plate (JICP), a dual-inlet dual-outlet (CP3) JICP, and a single-inlet dual-outlet (CP4) JICP were assessed computationally and benchmarked against a single-inlet single-outlet JICP (CP1) at the same area ratio (<i>AR</i>) and average diameter (<i>D_avg</i>) of inlet and outlet ports. The results show that the pressure losses inflate by up to 4.67 folds when using CP3 with <i>AR</i> = 5/3 and <i>D_avg</i> = 3.0 mm. Yet, this design also shows the largest Nusselt number and the lowest outlet water temperature, module body temperature, average temperature of the target surface, and thermal resistance (0.07415 K/W). The thermal resistance is reduced by 34.13% using CP3 at <i>AR</i> = 3/5 and <i>D_avg</i> = 6.0 mm. The temperature uniformity index was boosted to 97.5%. These enhancements are attributed to the shorter and symmetric flow path, the shorter residence time of water within the JICP, and the direct heat diffusion by the walls of the lower chamber.</p>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 1","pages":"117-144"},"PeriodicalIF":2.8,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860076","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}

{"title":"Numerical and experimental investigations of thermohydraulic performance enhancement of triangular duct solar air heaters using circular wing vortex generators","authors":"G. K. Pramod,&nbsp;N. Madhwesh,&nbsp;U. C. Arunachala,&nbsp;M. S. Manjunath","doi":"10.1002/htj.23167","DOIUrl":"https://doi.org/10.1002/htj.23167","url":null,"abstract":"<p>This study presents the thermohydraulic performance enhancement in a triangular duct solar air heater (TSAH) using circular wing vortex generators (CWVGs) on the absorber plate using computational fluid dynamics (CFD) methodology for the Reynolds number (<i>Re</i>) range of 6000–21,000. The use of wing vortex generators offers relatively lower interference with the core flow region, while the circular geometry offers a smooth curved edge, which reduces multiple vortex interactions in the wake region, thereby limiting the pressure drop. This study explores the impact of flow attack angle, longitudinal pitch, transverse pitch, and diameter of CWVG on the thermohydraulic performance of TSAH. The results reveal that a lower flow attack angle exhibits enhanced heat transfer with a lower friction factor penalty. The nondimensional diameter greater than <i>d/D_h</i> = 0.325 tends to limit heat transfer and exhibits an increased friction factor. The transverse pitch parameter also exhibits a similar trend where the threshold nondimensional pitch is found to be 1.5. The highest improvement in <i>Nu</i> is 4.37 times that of smooth duct for <i>d/D_h</i> = 0.433, <i>P_l/d</i> = 1, <i>P_t/d</i> = 1.5 and <i>α</i> = 20° at <i>Re</i> = 6000. The highest rise in friction factor is about 10.23 times that of smooth duct for <i>d/D_h</i> = 0.433, <i>P_l/d</i> = 1.0, <i>P_t/d</i> = 1.5, and <i>α</i> = 20° at <i>Re</i> = 21,000. The highest thermohydraulic performance parameter (THPP) value is about 2.23 at <i>Re</i> = 6000, with THPP values ranging from 1.69 to 2.23 across different CWVG configurations. Finally, mathematical correlations are developed for <i>Nu</i> and friction factors which are in close agreement with CFD results, with deviations averaging 5.03% and 3.69%, respectively.</p>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 1","pages":"81-116"},"PeriodicalIF":2.8,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/htj.23167","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860075","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}

{"title":"Effect of fluid flow behavior on sustainability and exergy efficiency of solar heat collectors having multiple V-ribs with gaps","authors":"Rajesh Maithani,&nbsp;Anil Kumar,&nbsp;Sachin Sharma,&nbsp;Tabish Alam","doi":"10.1002/htj.23166","DOIUrl":"https://doi.org/10.1002/htj.23166","url":null,"abstract":"<p>In the current numerical study, the viability and sustainability of a solar heat collector (<i>SHC</i>) have been rigorously analyzed through the lens of exergy analysis. The <i>SHC</i> with roughness in the form of symmetrical V-rib gaps has been selected for detailed numerical investigation. The study focuses on deriving the dominant parameters affecting the performance of the <i>SHC</i>, including the relative gap width (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <mi>g</mi>\u0000 \u0000 <mo>/</mo>\u0000 \u0000 <mi>e</mi>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> $g/e$</annotation>\u0000 </semantics></math>), number of gaps (<span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 \u0000 <mrow>\u0000 <msub>\u0000 <mi>N</mi>\u0000 \u0000 <mi>g</mi>\u0000 </msub>\u0000 </mrow>\u0000 </mrow>\u0000 <annotation> ${N}_{g}$</annotation>\u0000 </semantics></math>) in the limbs of ribs, and fluid flow Reynolds number, which varied from 4000 to 18,000. The absorber plate with roughness was thoroughly examined to evaluate the losses and irreversibility that persist in the thermal system. The results of the numerical analysis revealed the maximum exergy efficiency to be 3.87%. Furthermore, the study examined the long-term feasibility of the system, evaluating its sustainability index at a remarkable 1.0319 value, while the magnitude of the waste–energy ratio fetched an impressive score of 0.991. Additionally, the study found that the system has a significant improvement potential of 10.04. Overall, these findings provide critical insights into the performance and sustainability of <i>SHCs</i>, paving the way for future research and development in this crucial field.</p>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 1","pages":"66-80"},"PeriodicalIF":2.8,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142860074","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}

{"title":"Constructal design of cross-flow heat exchanger with concave/convex fins","authors":"Ahmed Waheed Mustafa,&nbsp;Israa R. Jawad,&nbsp;Ansam Adil Mohammed","doi":"10.1002/htj.23158","DOIUrl":"https://doi.org/10.1002/htj.23158","url":null,"abstract":"<p>A contractual design of cross-flow heat exchanger with concave/convex fins under fixed pressure drop is presented in this paper. An array of heated concave and convex fins are placed in a fixed area, and they are cooled by incoming cross flow, which is moving towards the fins due to constant pressure drop. The distances from fin to fin, the fin base, and the fin surface curvature (concave and convex) are free to morph and are constrained by the fin length and the height of cross flow. Bejan's number ranges from 10⁵ to 10⁷. The ratio of fin base-to-fin length is changed from 0.1 to 0.3. The dimensionless mass, momentum, and energy equations for two-dimensional, steady, and incompressible flow are solved based on the finite volume numerical method. Also, the scale analysis method is used to compare heat transfer densities from concave and convex fins. The numerical results showed that the maximal convective heat transfer density for convex fins is higher than that of the concave fins for all Bejan numbers. The augmentations in the maximal heat transfer density are 2.1% at <i>Be</i> = 10⁵, 4% at <i>Be</i> = 10⁶, and 12.5% at <i>Be</i> = 10⁷. Also, this is confirmed by the scale analysis method.</p>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 1","pages":"21-40"},"PeriodicalIF":2.8,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142862144","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}

{"title":"Prediction of thermal efficiency of double pass solar air heater having discrete multi V and staggered ribs","authors":"Ravi Kant Ravi,&nbsp;Sanjay Kumar,&nbsp;Mukesh Kumar,&nbsp;Manoj Kumar,&nbsp;Vikas Verma,&nbsp;Tabish Alam,&nbsp;Anil Singh Yadav,&nbsp;Abhishek Sharma","doi":"10.1002/htj.23164","DOIUrl":"https://doi.org/10.1002/htj.23164","url":null,"abstract":"<p>This manuscript endeavors to elucidate a comprehensive analysis for the assessment of thermal efficiency in double pass solar air collectors augmented with fabricated roughness, instrumental in the generation of heated air for applications in heating and drying. The analytical procedure delineates comparisons between a smooth and a double-sided, roughened absorber, characterized by discrete, multi V and staggered configurations of roughness. The analysis was performed for different roughness parameters including relative roughness width (<i>W</i>/<i>w</i>) from 4 to 8 and relative staggered rib size (<i>r</i>/<i>e</i>) from 1 to 4 and relative rib pitch (<i>p</i>′/<i>p</i>) from 0.2 to 0.8 while other parameters were kept constant. The research scrutinizes the impact of a constellation of parameters: the temperature rise coefficient (Δ<i>T</i>/<i>I</i>, varying between 0.002 and 0.02 K-m²/W), Reynolds number (Re, spanning 2000–20,000), solar irradiance (<i>I</i>, ranging from 600 to 1000 W/m²), and the geometric variables of the artificial roughness, on both the thermal efficiency and efficiency enhancement factor of the collector. The study revealed that the roughened collector exhibits higher thermal efficiency compared to smooth collector for a similar condition. The extreme enhancement in thermal efficiency of the collector with roughness has been found to be 56.75% more than nonroughened collector for Re = 2000. A further observation was made that thermal efficiency has increased sharply for lower flow rate (Re &lt; 10,000) whereas for higher flow rates (Re &gt; 10,000), this increase becomes nearly asymptotic. In addition, the efficiency enhancement factor has also been found to increase with an increase in Δ<i>T</i>/<i>I</i>. A peak value of 2.321 has been found to be obtained for the efficiency enhancement factor for Δ<i>T</i>/<i>I</i> = 0.02 K-m²/W and <i>I</i> = 1000 W/m² as a result of the studies conducted.</p>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 1","pages":"41-65"},"PeriodicalIF":2.8,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142862306","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}

{"title":"Thermal and hydrodynamic analysis inside a channel partially filled with porous material","authors":"Yazan Taamneh,&nbsp;Ravishankar Sathyamurthy","doi":"10.1002/htj.23150","DOIUrl":"https://doi.org/10.1002/htj.23150","url":null,"abstract":"<p>In this work, the transfer of heat and changes in fluid pressure within a rectangular channel fairly packed with porous material have been studied numerically for various Darcy numbers and dimensionless porous layers. The model was run with the following assumptions: laminar flow, forced convection, isotropic porous material, local thermodynamic equilibrium, constant wall temperature boundary condition, and no thermal dissipation. The study covers a broad range for the dimensionless porous layer, 0 ≤ <i>hr</i> &lt; 1, and the Darcy number, 10⁻⁴ &lt; <i>Da</i> &lt; 10⁻². The fully developed and developing flow over the channel is investigated in numerical study. It was observed that the inertia effect may be disregarded when <i>Da</i> &lt; 10⁻⁴. The local dimensionless bulk temperature distribution, pressure drop, and velocity profiles were all shown to be impacted by the Darcy number and dimensionless porous layers, according to the numerical analysis results. The maximum heat transfer rate was attained when the ratio of the porous layer inside the channel was 0.8, and the pressure gradient was the highest. Partial packing of the channel with a porous material has two advantages: it increases the rate heat transmission rate and results in a much smaller pressure drop than a filled porous medium.</p>","PeriodicalId":44939,"journal":{"name":"Heat Transfer","volume":"54 1","pages":"5-20"},"PeriodicalIF":2.8,"publicationDate":"2024-08-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142862139","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}