International Journal of Heat and Mass Transfer最新文献

{"title":"Design of thermal conductivity, permeability, and heat storage behavior of Composite Phase Change Materials based on metallic TPMS lattices","authors":"Matteo Molteni,&nbsp;Sara Candidori,&nbsp;Serena Graziosi,&nbsp;Elisabetta Gariboldi","doi":"10.1016/j.ijheatmasstransfer.2025.126730","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126730","url":null,"abstract":"<div><div>The paper focuses on composites based on inner Al-alloy sheet-based Triply Periodic Minimal Surfaces (TPMSs) structures, which can be manufactured with high porosity (<em>ε</em>), leading to two non-interconnected domains. These conditions favor designing Composite Phase Change Materials (C-PCMs) in which the void domains are filled by the same or different PCMs, which enable thermal energy storage in the form of latent heat. In this paper, we demonstrate that C-PCMs can be designed based on models of their effective thermophysical properties. To this aim, the effective thermal conductivity (<em>λ_eff</em>) of various Al-based TPMS structures, among which Primitive-Schwarz (PS), Gyroid (G), Diamond (D), and I-graph and wrapped package graph (I-WP), was calculated and analytically modeled. Different filling phases, such as tin, paraffins, or water, were considered to evaluate the influence of the thermal conductivity ratio of the two C-PCM phases at different <em>ε</em>. Furthermore, the transient thermal behavior of Al-based PS C-PCMs was numerically simulated in the extreme cases of temperature ramp or constant heat flux inputs. Low-conductive paraffin and high-conductive tin were selected as filling materials. The results of the analyses revealed that in the first case (temperature ramp), the hybrid Al/paraffin C-PCM exhibited fast phase change, corresponding to peak-type thermal power storage and higher differences between Al and paraffin phase temperatures. Constant heat flux led to a more gradual paraffin melting and heat storage. Instead, the choice of the boundary conditions is less influential on the fully metallic C-PCM response. Combining two different PCMs with the PS lattice further modulates the thermal response of C-PCMs, making them appealing for Temperature Management (TEM) purposes. Finally, an analytical model of the permeability of PS structures was developed based on numerical simulations and compared to highly scattered literature data. Permeability estimation allows the calculation of the Rayleigh-Darcy parameter, setting thresholds for the onset of the convection of the molten PCM phase within the TPMS skeleton, which modifies the thermal response of the C-PCM.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"241 ","pages":"Article 126730"},"PeriodicalIF":5.0,"publicationDate":"2025-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Design and experimental study of a dual compensation chamber flat loop heat pipe for electronic devices","authors":"Yongqi Xie ,&nbsp;Zhen Fang ,&nbsp;Jinpeng Wei ,&nbsp;Hongwei Wu ,&nbsp;Hongxing Zhang ,&nbsp;Guoguang Li","doi":"10.1016/j.ijheatmasstransfer.2025.126707","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126707","url":null,"abstract":"<div><div>In this article, a novel flat loop heat pipe with dual compensation chamber was designed and manufactured to address the heat dissipation challenges of high-power electronic devices operating in various orientations. Ammonia was selected as the working fluid, with stainless steel used for the casing material. The capillary wick consisted of a combination of a wire mesh and a sintered nickel wick. A theoretical analysis was performed based on the distribution of the working fluid in the two compensation chambers, identifying three possible thermodynamic processes for the flat loop heat pipe. The startup and heat transfer performance were experimentally evaluated under six different orientations and varying heat sink temperatures. Experimental results indicated that: (1) the flat loop heat pipe successfully starts and reaches a steady state at 100 W in all orientations, with gravity influencing the startup process by altering the working fluid distribution in the two compensation chambers; (2) at a heat sink temperature of 20 °C, the maximum heat transfer capacity reaches 500 W, while the minimum thermal resistance is 0.059 °C/W at 450 W; (3) when the heat load exceeds 250 W, the impact of orientation on operating temperature and thermal resistance becomes negligible; and (4) the flat loop heat pipe has excellent transient response performance under varying heat loads across different orientations. These finding provide valuable insights for the application of flat loop heat pipes in avionics devices with complex and variable orientations.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"241 ","pages":"Article 126707"},"PeriodicalIF":5.0,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143131010","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":"Improvement of pure ammonia combustion performance using the catalytic pre-cracking method","authors":"Chengguang Tong ,&nbsp;Zuobing Chen ,&nbsp;Jing Cao ,&nbsp;Zhihua Deng ,&nbsp;Siew Hwa Chan","doi":"10.1016/j.ijheatmasstransfer.2025.126667","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126667","url":null,"abstract":"<div><div>As a storage and transportation medium for hydrogen and a clean fuel with zero carbon emissions, ammonia (<span><math><msub><mrow><mi>NH</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span>) plays an important role in promoting hydrogen energy economy and renewable energy utilization. However, <span><math><msub><mrow><mi>NH</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span> faces issues of low combustion intensity and the difficulties of ignition when used as a fuel. To address these problems, a novel combustion method with high temperature resistance and strong activity catalyst for <span><math><msub><mrow><mi>NH</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span> pre-cracking is proposed in this paper. The cracking product, hydrogen, has a higher combustion rate, lower ignition temperature, and higher combustion intensity, which can improve the combustion characteristics of pure <span><math><msub><mrow><mi>NH</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span>. Firstly, Computational Fluid Dynamics was used to simulate the whole process of catalytic cracking and combustion of <span><math><msub><mrow><mi>NH</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span>. An Eulerian multiphase flow model with a granular phase was employed to simulate the catalyst particles and a porous medium to simulate the support carrier for the catalyst particles. Secondly, the Langmuir-Hinshelwood model was built using user-defined functions (UDF) to describe the reaction kinetic rates of the adsorption, cracking, and desorption processes of <span><math><msub><mrow><mi>NH</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span> on the surface of Ni/<span><math><mrow><msub><mrow><mi>Al</mi></mrow><mrow><mn>2</mn></mrow></msub><msub><mrow><mi>O</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span> catalyst. Then, species indexing in the flow field was implemented using UDF to couple the catalytic reaction rate with the surface coverage concentration to improve the simulation accuracy and reliability. Finally, the simulation results revealed that the catalytic pre-cracking combustion method can significantly improve the thermal efficiency and stability of <span><math><msub><mrow><mi>NH</mi></mrow><mrow><mn>3</mn></mrow></msub></math></span> combustion.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"241 ","pages":"Article 126667"},"PeriodicalIF":5.0,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143131015","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":"Study on mass transfer in large-aspect-ratio micromixer with continuous dual splitting and recombination, and inclined ridges","authors":"Lili Han,&nbsp;Jincai Yue,&nbsp;Litao Qin,&nbsp;Yunchang Qu,&nbsp;Dongjian Zhou,&nbsp;Yugang Li","doi":"10.1016/j.ijheatmasstransfer.2025.126706","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126706","url":null,"abstract":"<div><div>Micromixers are critical components within microfluidic systems, known for their outstanding mass and heat transfer capabilities. However, during the scale-up, micromixers with large width-to-height aspect ratios (<em>AR</em>) demonstrate minimal variation in specific surface area, which results in a negligible impact on heat transfer efficiency, but a noticeable decline in mass transfer performance. This study introduces a novel micromixer design, the large-aspect-ratio micromixer with continuous dual splitting and recombination, and inclined ridges (CDSARR). To assess the distribution of component mass flow during fluid splitting within channels of varying <em>AR</em>, a new parameter is introduced: component distribution uniformity (<em>CDU</em>). For the CDSARR micromixer, the <em>CDU</em> values at the end of the first-order sub-channels consistently exceeds 0.75 when 0.001 ≤ <em>u</em> ≤ 0.3 m/s and 3 ≤ <em>AR</em> ≤ 4, indicating favorable conditions for further splitting. Conversely, in the large-aspect-ratio micromixer with continuous dual splitting and recombination (CDSAR) under medium and low Reynolds number (<em>Re</em>), <em>CDU</em> values at the end of the first-order sub-channels are consistently below 0.40, leading to suboptimal component distribution and poor mixing efficiency. The integration of inclined ridges within the first-order sub-channels effectively mitigates component distribution issues during subsequent fluid splitting, while their addition in the second-order sub-channels enhances mixing by expanding the contact area post-recombination. Across the <em>Re</em> range of 1 to 200, the CDSARR micromixer exhibits a mixing index that surpasses that of the CDSAR micromixer, maintaining a relatively superior value, especially at low <em>Re</em>, with only a negligible difference in pressure drop between the two micromixers. A evaluation of the comprehensive performance reveals that the CDSARR micromixer offers stable and consistently lower running cost compared to the CDSAR micromixer.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"241 ","pages":"Article 126706"},"PeriodicalIF":5.0,"publicationDate":"2025-01-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143131014","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":"Numerical study of structural changes in the laboratory model of the atmospheric general circulation under variation of the rotation rate","authors":"Andrei Gavrilov ,&nbsp;Andrei Sukhanovskii ,&nbsp;Andrei Vasiliev ,&nbsp;Elena Popova","doi":"10.1016/j.ijheatmasstransfer.2025.126676","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126676","url":null,"abstract":"<div><div>The results of numerical modelling of the large-scale atmospheric circulation are presented. The main objective of this study is to describe the adaptation of the Earth-like atmospheric system to the variation of the rotation rate at fixed heating and cooling power. The increase in the rotation rate destabilize axisymmetric Hadley regime, squeezes the Hadley cell analog towards the periphery, leads to the formation of another two relatively weak meridional cells (analogs of the polar and Ferrel cells) and weakens the intensity of the meridional circulation. The changes in the mean flow structure are accompanied by noticeable variation of the mean temperature distribution. Adaptation of the system to new conditions led to the development of wave motions and compensation of the loss in mean part of the total heat flux by its pulsating part. The regular baroclinic waves begin to play a key role in the transport of heat. The further increase of the rotation rate leads to the irregular wave baroclinic regime (atmospheric regime), which is characterized by increasing energy of smaller scale waves. The total kinetic energy of the relative flow motion decreases with increasing rotation rate, but the energy of the radial flow, which provides most of the heat transfer, increases due to the pulsation part.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"241 ","pages":"Article 126676"},"PeriodicalIF":5.0,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143131011","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":"Dynamics of a submerged plate of different optical properties in a heated by radiation convective cell","authors":"Peter Frick ,&nbsp;Sergey Filimonov ,&nbsp;Andrei Gavrilov ,&nbsp;Kirill Litvintsev ,&nbsp;Andrei Sukhanovskii ,&nbsp;Elena Popova ,&nbsp;Andrei Vasiliev","doi":"10.1016/j.ijheatmasstransfer.2025.126675","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126675","url":null,"abstract":"<div><div>Thermal convection in a fluid layer heated by radiation from above, in which a horizontal plate with different optical properties floats at a fixed depth, has been studied experimentally and numerically. The plate floats near the bottom and is realized in the experimental setup as a disk with a diameter slightly smaller than the cavity width, which determines the one-dimensional character of its displacements. The numerical modeling is performed in a two-dimensional formulation, which implies a square shape of the plate. Four versions of the optical properties of the disk are considered: absorbing, transparent, reflecting, and mixed, i.e., partly reflecting - partly transmitting. Both experiments and simulations have shown that a plate that absorbs or transmits all radiation does not drift in the convective flow, while a mirror-reflecting plate can lead to a stable periodic oscillations (‘convective pendulum’ mode). The dynamics of a plate that partially transmits the incident radiation and reflects the rest of the radiation flux is studied for the whole range of transmittance <span><math><mi>K</mi></math></span> (the ratio of the transmitted radiation to the incident radiation) from zero to one. It is shown that <span><math><mi>K</mi></math></span> is a governing parameter of the system. Changes of transmittance provide variety of regimes from the quasi-periodic plate motions to the very complex dynamics with chaotic wandering and long idle times at the sidewall.The numerical simulations were carried out for a wide range of radiation fluxes. Over the whole range considered, the mirror reflecting plate exhibits the convective pendulum mode. It is shown that the transition from the first to the second type of boundary conditions has no particular influence on the character of the motion, in contrast to the vertical location of the plate. The intensity of the convective flow is characterized by the Reynolds number, which follows a power law <span><math><mrow><mi>Re</mi><mo>∼</mo><msup><mrow><mi>Ra</mi></mrow><mrow><mi>α</mi></mrow></msup></mrow></math></span>, with a slightly larger value of the scaling exponent compared to classical Rayleigh–Bénard convection (0.59 versus 0.5). The plate motions accelerate with the convective flows and the plate oscillation frequency increases with the Reynolds number. The Nusselt number, which determines the dimensionless convective heat flux, follows the usual law for convective systems <span><math><mrow><mi>Nu</mi><mo>∼</mo><msup><mrow><mi>Ra</mi></mrow><mrow><mn>0</mn><mo>.</mo><mn>28</mn></mrow></msup></mrow></math></span>.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"241 ","pages":"Article 126675"},"PeriodicalIF":5.0,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130886","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 universal structure of neural network for predicting heat, flow and mass transport in various three-dimensional porous media","authors":"Hui Wang ,&nbsp;Mou Wang ,&nbsp;Ying Yin ,&nbsp;Zhiguo Qu","doi":"10.1016/j.ijheatmasstransfer.2025.126688","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126688","url":null,"abstract":"<div><div>Predicting heat, flow and mass transport properties in three-dimensional (3D) porous media is computationally and experimentally intractable owning to the complex morphological and topological characteristics of 3D porous media. To address this challenge, we develop a 3D transport field-coefficients-convolutional neural network (TFC<img>CNN) platform in which the training samples for the proposed TFC<img>CNN platform rely only on transport field data of 3D sphere-packed structure calculated by lattice Boltzmann method. Then, the transport fields (including gas diffusion, flow, and temperature) of 3D porous media with six kinds of topological characterizations (<em>e.g</em>., sphere-packed, irregular, fibrous and curvature fibrous porous media, gyroid structure, and foam structure, respectively) can be predicted with a wide range of porosities. The corresponding transport coefficients are further obtained. In addition, the sample structure information self-amplification method is developed to enrich the number of training samples. Results show that the proposed TFC<img>CNN platform can accurately predict the concentration, velocity, and temperature fields in various stochastic porous media with a wide range of porosities. The corresponding effective diffusivity, permeability, and thermal conductivity coefficients predicted by TFC<img>CNN platform are more accurate than those predicted by the empirical formulas. For validation model, the prediction time for velocity field in sphere-packed porous media is about seconds by TFC<img>CNN platform, while the computation time for the same case takes several days with running on hundreds of cores for 318 million grids using LBM. This work can provide new insights to bridge the gap between a material microstructure and its macroscopic physical performance.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"241 ","pages":"Article 126688"},"PeriodicalIF":5.0,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130885","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":"Thermal conductivity of hydrogels with damaged network","authors":"Tonghao Wu ,&nbsp;Danming Zhong ,&nbsp;Shaoxing Qu","doi":"10.1016/j.ijheatmasstransfer.2025.126690","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126690","url":null,"abstract":"<div><div>The thermal conductivity of polymeric materials is greatly influenced by the morphology of the internal molecular networks. Specifically, the irreversible alteration of molecular networks through external stress or damage changes the thermal conductivity of polymers. However, the intricate relationship between molecular network alteration and changes in thermal conductivity under large deformations remains elusive. To elucidate and quantify the variation of thermal conductivity in hydrogels as a result of the damage of polymer networks, it is necessary to construct a physically-based model. In this work, taking the PAAm-PAAm double-network hydrogel as a model material, we utilized uniaxial tension to precisely modulate the damage levels of materials. Notably, experimental observations revealed a decrease in hydrogel's thermal conductivity concurrent with progressive structural damage. It was assumed that the inter-molecular heat transfer pathways were reduced due to damage of cross-linkers within the networks. Then a percolation model utilizing square site structures for capturing heat transfer pathways’ influence on overall thermal conductivity was constructed. This work deepens our fundamental understanding of the interaction between damage-induced network alteration and the evolution of thermal conductivity. Moreover, the constructed model enables the prediction of changes in the thermal conductivity of hydrogels through simple mechanical testing.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"241 ","pages":"Article 126690"},"PeriodicalIF":5.0,"publicationDate":"2025-01-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143131012","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":"Investigation of thermal behavior and fluid dynamics within molten pool during quasi-continuous-wave laser directed energy deposition","authors":"Bo Chen ,&nbsp;Xiuli He ,&nbsp;Binxin Dong ,&nbsp;Yanhua Bian ,&nbsp;Shaoxia Li ,&nbsp;Sining Pan ,&nbsp;Gang Yu","doi":"10.1016/j.ijheatmasstransfer.2025.126704","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126704","url":null,"abstract":"<div><div>The quasi-continuous-wave laser directed energy deposition (QCW-DED), a form of directed energy deposition (DED), has garnered growing interest in recent years due to its ability to reduce thermal deformation and improve the performance of manufactured components. However, the interaction between the quasi-continuous-wave (QCW) laser and the molten pool surface, and its subsequent effects on the dynamics and morphology of the molten pool, is still not clear. In this work, a coupled ray-tracing computational fluid dynamics (CFD) model, which integrates a laser-powder interaction model and material deposition model, is developed to study the multi-physics coupling characteristics in QCW-DED process. The incident angle between the laser rays and molten pool surface was quantified and the corresponding laser absorptivity was analyzed. After accounting for the influence of laser-surface interaction, the heat transfer and fluid dynamics within the molten pool were subsequently investigated. Several dimensionless numbers, including the Fourier number (Fo), Peclet number (Pe), Marangoni number (Ma), and Grashof number (Gr), were employed to elucidate the physical mechanisms underlying the evolution of the molten pool. The results show that the heat transfer within the molten pool is controlled alternately by thermal convection and thermal conduction during the QCW-DED process. Furthermore, the Marangoni effect and buoyancy effect are weaker in the QCW-DED process compared to the continuous-wave laser directed energy deposition (CW-DED) process. However, the molten pool has a stronger heat dissipation capability in the QCW-DED process. Finally, the calculated molten pool geometry shows good agreement with the experimental results with the relative error less than 14.5%. This work provides a deeper insight into laser-surface interaction and the dynamics behavior within the molten pool during the QCW-DED process. The developed model can also serve as a fundamental tool for understanding the forming mechanism, predicting the deposition quality and optimizing the process of QCW-DED.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"241 ","pages":"Article 126704"},"PeriodicalIF":5.0,"publicationDate":"2025-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130261","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":"Exposed-area dependent forced convective heat transfer in periodic lattice structures","authors":"Jiaxi Zhao ,&nbsp;Kim Leong Liaw ,&nbsp;Mohammad Zolfagharroshan ,&nbsp;Minghan Xu ,&nbsp;Abdolhamid Akbarzadeh ,&nbsp;Agus P. Sasmito","doi":"10.1016/j.ijheatmasstransfer.2025.126683","DOIUrl":"10.1016/j.ijheatmasstransfer.2025.126683","url":null,"abstract":"<div><div>This study presents numerical investigations of heat transfer and fluid flow in metal foams made of distinctive topologies. Two bio-inspired structures referred to as sponge and body-centered sponge (BCS), which exhibit identical thermophysical properties along three orthogonal axes, are proposed. Initially, the pore-scale computational model is validated, showing a deviation of less than 3 % when compared to the existing literature. Despite the intricate conductive pathways of the BCS structure, it is found to be a highly promising porous material as a heat exchanger, exhibiting the highest Nusselt number (twice as much as in cubic structures in water flow), friction factor (4.7 times as that in cubic structures in water flow), and performance evaluation criterion (PEC) (1.2 times as that in cubic structures in water flow). In addition, it is concluded that the large exposed area of fluid-foam walls and the high tortuosity of the BCS structure significantly enhance the Nusselt number. This complexity increases the frequency of flow deflection and stagnation, contributing to improved heat transfer performance. Finally, empirical equations for the Nusselt number and friction factor as a function of the unified exposed area parameter, Reynolds number, and Prandtl number have been developed with acceptable precision, accompanying with the R-squared value higher than 0.97.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"241 ","pages":"Article 126683"},"PeriodicalIF":5.0,"publicationDate":"2025-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143130725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}