Jumpei Hatakeyama^1,2,*, Takashi Fukue², Hidemi Shirakawa¹, Yasuhiro Sugimoto²

Frontiers in Heat and Mass Transfer, Vol.24, No.4, 2026, DOI:10.32604/fhmt.2026.086397 - 31 August 2026

Abstract This paper describes a pin fin spacing designed to maximize forced convection heat transfer performance by combining pulsating flow with a pin fin array. With the recent miniaturization and high-density packaging of electronic equipment, thermal management has become a critical issue due to the increasing heat generation density. To address this challenge, we have focused on pulsating flow, commonly observed in blood circulation systems, and investigated its potential to enhance heat transfer. Previous studies have shown that pulsating flow enhances the overall heat transfer around heating elements and ribs by supplying low-temperature coolant to the… More >

Kai Luo¹, Yifei Xie¹, Kun Chen¹, Haibing Chen^2,*, Wei Tang^1,*, Shaohua Bi³, Jirong Zhang³, Weifeng He³

Frontiers in Heat and Mass Transfer, Vol.24, No.4, 2026, DOI:10.32604/fhmt.2026.084890 - 31 August 2026

Abstract The internal structure of porous media is strongly correlated with flow and thermal transport characteristics, which further influences the overall heat transfer performance of the entire system. Based on explicit structural representation, a three-dimensional numerical method for coupled flow and heat transfer in multi-layered porous sheet arrays is established, utilizing momentum source terms for porous media and a local thermal equilibrium heat transfer model. The impacts from porosity, inlet velocity, and heating power on the flow and heat transfer characteristics within the segment are systematically investigated, with the porosity range determined based on microstructural observations,… More >

Yuzhang Wang^1,2,*, Zhuning Liu¹, Haozhe Sun¹, Zhuo Li³, Kanru Cheng¹, Chaoran Yang¹

Frontiers in Heat and Mass Transfer, Vol.24, No.4, 2026, DOI:10.32604/fhmt.2026.084530 - 31 August 2026

Abstract During the operation of a gas turbine, the surface morphology of thermal barrier coatings (TBCs) of the high temperature blades inevitably evolves due to sintering, particle deposition or other factors, leading to an increase in surface roughness. This altered roughness can significantly influence the flow behavior of cooling films and the heat transfer performance of the coupled cooling film-TBC system. In this work, the flow behavior and conjugate heat transfer between cooling film and TBC under varying surface roughness conditions were investigated using the double distribution function lattice Boltzmann method (DDF-LBM) coupled with large eddy… More >

Dawar Asfandyar Khan, Yanyu Chen, Haokang Zhang, Yu Wang^*

Frontiers in Heat and Mass Transfer, Vol.24, No.4, 2026, DOI:10.32604/fhmt.2026.083157 - 31 August 2026

Abstract Efficient thermal management of high heat flux systems is critical in modern electronic and energy devices. Spray cooling, with its high heat removal capability and uniform surface cooling, is widely recognized as an effective technique. Extensive studies have explored spray cooling using water and other working fluids, focusing on droplet dynamics, surface wetting, and heat transfer enhancement. However, the influence of low-concentration alcohol additives on spray cooling performance and evaporation dynamics remains insufficiently understood. This work systematically investigates the non-monotonic heat-transfer behaviour by varying spray height, flow rate, and heat input individually, focusing on the… More >

Jiaxi Shen, Zhiyun Wang^*

Frontiers in Heat and Mass Transfer, Vol.24, No.4, 2026, DOI:10.32604/fhmt.2026.081961 - 31 August 2026

Abstract This study focuses on the modeling and performance prediction of the condensation heat transfer process within an ACC system of a 100 MW unit. A one-dimensional physical model was established, and solutions were obtained using an iterative numerical method based on the first law of thermodynamics. The core of this work involves precise modifications to the heat transfer coefficient. Firstly, the Shah correlation for horizontal tube condensation was improved by incorporating the air mass fraction and the Jakob number to quantify the impact of non-condensable gases. Secondly, to assess the influence of the pipe installation More >

Anyu Hong¹, Zheng-Yang Li^2,*

CMES-Computer Modeling in Engineering & Sciences, Vol.148, No.2, 2026, DOI:10.32604/cmes.2026.084527 - 28 August 2026

Abstract The simulation of non-Fourier heat conduction poses significant computational challenges, particularly in periodic structures such as thermal wave crystals or thermal metamaterials. This paper employs the Local Radial Basis Function Collocation Method (LRBFCM) to evaluate the wave-like propagation characteristics inherent to the non-Fourier heat transfer process. Utilizing LRBFCM, the complex band structure of thermal wave crystals is calculated, and these findings are validated against temperature responses in the frequency domain. Finally, this study introduces a robust methodology for predicting non-Fourier heat conduction behavior in thermal metamaterials. In a word, this paper investigates the application of More >

Ayoube Baalla^*, Mourad Najjaoui, Thami Ait-Taleb, Hassan Chaib

FDMP-Fluid Dynamics & Materials Processing, Vol.22, No.7, 2026, DOI:10.32604/fdmp.2026.083469 - 31 July 2026

Abstract The complex interplay of heat transfer mechanisms, namely conduction, natural convection, and radiation, within hollow block roofs exposed to solar irradiation gives rise to an inherently nonlinear thermal exchange problem. A key yet insufficiently explored question is the extent to which this nonlinearity governs the macroscopic thermal behavior of roofing systems. In this study, a computational investigation is conducted on two roof configurations incorporating five hollow block geometries representative of common construction practices in hot climatic regions. The objective is to identify the optimal design capable of minimizing heat losses and thereby enhancing the overall… More >

Lishuang Zheng^1,*, Fengjun Chen²

FDMP-Fluid Dynamics & Materials Processing, Vol.22, No.7, 2026, DOI:10.32604/fdmp.2026.083363 - 31 July 2026

Abstract A computational fluid dynamic (CFD) numerical framework is established in this article to comprehensively uncover the flow evolution laws and gas-liquid phase-change heat transfer mechanisms of vertical falling film with high Reynolds numbers (Re). Systematic numerical analysis are carried out to characterize the liquid film spatial distribution, flow velocity field, internal turbulent vortex structures and comprehensive heat transfer behaviors. The swirl-induced coherent structures are identified using velocity vectors and vortex-detection criteria, and the influences of swirl angle, channel width, and platform height on film thickness distribution and thermal performance are examined. Model validation is performed through… More >

Xuewen Cao^*, Zhe Chen, Gaoya Ding, Wei You

FDMP-Fluid Dynamics & Materials Processing, Vol.22, No.7, 2026, DOI:10.32604/fdmp.2026.080209 - 31 July 2026

Abstract A two-dimensional Computational Fluid Dynamics (CFD) model, grounded in classical nucleation theory, is developed to investigate CO₂ frosting and the associated heat transfer under cryogenic conditions. The model integrates gas–solid phase-change kinetics with multiphysics transport equations to capture the coupled phenomena governing frost formation. The Peng–Robinson equation of state is employed to predict CO₂ frost points in binary mixtures, with model predictions validated against experimental data, yielding errors in frost thickness and thermal conductivity below 15%. The results demonstrate that decreasing the cryogenic wall temperature from 160 K to 150 K increases the average frost thickness… More >

Lei Yang^1,2, Yiyun Hu¹, Xianglong Yang^1,*

CMES-Computer Modeling in Engineering & Sciences, Vol.148, No.1, 2026, DOI:10.32604/cmes.2026.083905 - 27 July 2026

Abstract Accurate prediction of entropy generation in nanofluid turbulent convection is essential for optimizing thermal system efficiency, yet remains challenging due to complex near-wall phenomena and thermal property variations with temperature. This study applied an elliptic blending turbulence model (SST k-ω-φ-α) to numerically analyze entropy generation in alumina-water nanofluid flow through a uniformly heated circular tube. The model’s performance was validated using both experimental data and established heat transfer and fluid flow correlations at small wall-bulk temperature difference condition, and its superiority was rigorously evaluated against two widely adopted turbulence models (SST k-ω and realizable k-ε).… More >