International Journal of Heat and Mass Transfer最新文献

{"title":"Thermoelastic damping in moderately thick microplate resonators based on the fractional heat conduction model","authors":"Ya-Wei Wang,&nbsp;Xue-Yang Zhang,&nbsp;Xian-Fang Li","doi":"10.1016/j.ijheatmasstransfer.2024.126394","DOIUrl":"10.1016/j.ijheatmasstransfer.2024.126394","url":null,"abstract":"<div><div>Thermoelastic damping is a fundamental mechanism for intrinsic energy loss in resonators operating at room temperature. Accurate prediction of thermoelastic damping is of paramount importance for the design and manufacture of high-performance micro-resonators. In this study, thermoelastic dissipation in relatively thick micro-plate resonators is investigated. A new first-order shear deformation plate theory, or the simplified Mindlin plate theory (SMPT), and fractional-order Fourier heat conduction are utilized to establish an analytical model for thermoelastic micro-plates. By employing the complex frequency approach (CFA) and energy ratio approach (ERA), an analytical expression for the inverse quality factor <span><math><msup><mrow><mi>Q</mi></mrow><mrow><mo>−</mo><mn>1</mn></mrow></msup></math></span> of rectangular micro-plates is derived. To validate the present model, the numerical results for fully clamped thin plates and SMPT are compared, and those for fully simply supported thick plates using CFA and ERA are also compared. Emphasis is focused on analyzing the effects of shear deformation and rotary inertia of the section, subdiffusion, normal diffusion, and superdiffusion on thermoelastic damping in moderately thick micro-plate resonators. The effect of geometry, vibration modes, boundary constraints, and ambient temperatures on thermoelastic dissipation is also discussed. The numerical results indicate that shear deformation should be considered while the rotary inertia may be neglected in the analysis of thermoelastic damping in vibrating relatively thick plates for the fundamental mode.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"237 ","pages":"Article 126394"},"PeriodicalIF":5.0,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651212","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 investigation on aerothermal performances of film cooled high pressure turbine vane under inlet non-uniformities","authors":"Shenghui Zhang ,&nbsp;Shuiting Ding ,&nbsp;Tian Qiu ,&nbsp;Chuangkai Liu ,&nbsp;Chenyu Gan","doi":"10.1016/j.ijheatmasstransfer.2024.126398","DOIUrl":"10.1016/j.ijheatmasstransfer.2024.126398","url":null,"abstract":"<div><div>Lean-premixed combustion technologies have been widely adopted in advanced civil turbofan engine to reduce NOx emission. There exist hot streak (HS) and swirl simultaneously at the exit of lean-premixed combustor. Current paper presents a numerical investigation on the aerothermal performances of film cooled high pressure turbine (HPT) nozzle guide vane (NGV) subjected to HS and swirl. Current investigation was carried on the stage one film cooled NGV of GE-E3 HPT, which took into consideration the realistic clocking position of HPT NGV relative to the fuel injector in combustor. The effects of swirl orientations on the migration of HS and film coolant and the aerothermal performances on NGV surface were examined. Results demonstrates that, swirl and its induced incidence angle effect turn over some film coolant from pressure side (PS) to suction side (SS), or vice versa. Such effects also dominate the radial migration of film coolant. The redistributions of film coolant show significant effect on the film cooling effectiveness on NGV surface. Compared with no-swirl case, the greater film cooling effectiveness appears at the region where film coolant accumulates, and as expected, the smaller film cooling effectiveness arises at the region covered by less film coolant. As for heat transfer coefficient (HTC), swirl affects HTC on NGV surface mainly through redistributing film coolant and the hot fluid from HS. The migrations of film coolant and hot fluid keep step with each other on the NGV surfaces directly impinged by inlet HS and swirl, so that the HTC distributions on these surfaces are not significantly affected by swirl. The radial momentum of film coolant endowed by the film hole with radial incidence angle can partly offset the swirl's induced incidence angle effect, which reduces the variations in film cooling effectiveness and heat transfer coefficient due to swirl.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"237 ","pages":"Article 126398"},"PeriodicalIF":5.0,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651211","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":"Thermo-hydrodynamic performance and geyser boiling flows of a novel co-axial condensing heat pipe (CCHP) for low-grade green energy exploitations","authors":"Yong-Juan Song ,&nbsp;Bin Li ,&nbsp;Jun-Hao Chen ,&nbsp;Wei-Wei Wang ,&nbsp;Fu-Yun Zhao ,&nbsp;Jiang-Hua Guo","doi":"10.1016/j.ijheatmasstransfer.2024.126391","DOIUrl":"10.1016/j.ijheatmasstransfer.2024.126391","url":null,"abstract":"<div><div>Due to their excellent heat transfer efficiency, two-phase closed thermosiphons (TPCTs) are essential for solar applications and the cooling of electronics. In this research, a novel coaxial condensing heat pipe (CCHP) was proposed, which has a more compact structure compared to traditional heat pipe, given the same volume and heat transfer area. Numerical modeling and experimental investigation were fully utilized to examine the influences of heat inputs, inclination angles, liquid filling ratios, and working mediums on the heat transmission properties of CCHP. The vapor-liquid flow phenomenon along with the thermal and mass transmission mechanism of CCHP under various operating conditions were explored. Our findings demonstrated that CCHP exhibited optimal thermal transmission performance at the tilt angle of 60° when the filling rate is 50 % and the input power is 100 W, the minimum thermal resistance of CCHP is 0.284K/W. At the tilt angle of 60° and input power of 100 W, CCHP has the lowest thermal resistance of 0.267K/W. Besides, the utilization of ethanol as a working medium could simultaneously reduce the evaporator temperature and enhance the thermal properties of CCHP. Inside CCHP, \"geyser boiling\" phenomena was further observed. Our experimental findings and numerical ones agreed well for each other. This innovative heat pipe could be confident and robust applied in the solar energy collection and relevant heat transfer enhancement fields.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"237 ","pages":"Article 126391"},"PeriodicalIF":5.0,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142651209","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":"Microchannel heat sinks for hotspot thermal management: achieving minimal pressure drop and maximal thermal performance","authors":"Biqi Cao ,&nbsp;Zan Wu","doi":"10.1016/j.ijheatmasstransfer.2024.126411","DOIUrl":"10.1016/j.ijheatmasstransfer.2024.126411","url":null,"abstract":"<div><div>In hotspot regions, where heat flux can reach several orders of magnitude higher than in surrounding area, managing hotspot temperatures becomes a prominent issue. This study introduces three innovative heat sink designs that effectively manage high temperatures in hotspot regions while minimizing power consumption. The hydraulic and thermal performances of these designs were evaluated numerically and compared with those of the conventional straight parallel microchannel (SPMC) heat sink and previous designs from the literature. By integrating pin-fins in hotspot regions and positioning the fluid inlet above the hotspot to leverage jet impingement, these designs significantly improved the heat transfer coefficient in hotspot areas. The MMC structure, featuring a manifold configuration, achieved an 81.4 % reduction in pressure drop compared to the SPMC design. The RMC structure demonstrated superior temperature uniformity. Additionally, the impact of the jet inlet angle on the hydraulic-thermal performance of the RMC heat sink was investigated. The AMC structure, which integrates the benefits of both RMC and MMC, achieved an impressive 87.9 % reduction in pressure drop compared to the SPMC design, underscoring its advanced performance.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"236 ","pages":"Article 126411"},"PeriodicalIF":5.0,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664073","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 investigation of the performance of a phase change material thermal management module under vacuum and atmospheric pressure conditions","authors":"Laryssa Sueza Raffa ,&nbsp;Matt Ryall ,&nbsp;Nick S. Bennett ,&nbsp;Lee Clemon","doi":"10.1016/j.ijheatmasstransfer.2024.126384","DOIUrl":"10.1016/j.ijheatmasstransfer.2024.126384","url":null,"abstract":"<div><div>High computational power and miniaturisation of modern electronics lead to high heat generation, compounded by the decreased available area for heat dissipation. This challenge is exacerbated in space environments due to the lack of convection. Phase change materials (PCM) are a strong option for the passive thermal management of satellites. However, their behaviour in vacuum is unclear. This study experimentally investigates and compares the performance of non-PCM and PCM-based thermal control modules under atmospheric pressure and vacuum conditions. A stainless steel heat sink with internal planar fins was tested using a printed circuit board (PCB) to produce three input power levels, simulating the heat dissipated by satellite electronics. Paraffin wax was used as the PCM. The thermal performance is reported and analysed for both pressure conditions. A reduced-order numerical model was established to predict performance with low required computational effort. This work finds that electronics operating in vacuum displayed temperatures as much as 32.8% higher compared to those in atmosphere due to decreased heat dissipation resulting from the lack of convective heat transfer. In addition, PCM had a greater impact in reducing the electronics temperature in vacuum than at atmospheric pressure. The presence of 6 g of PCM lowered the electronics temperatures by up to 18.0 °C in vacuum, and by up to 12.3 °C in atmospheric pressure. That amount of PCM doubled the electronics operating time under both pressure conditions at high power. The findings of this work contribute to understanding the performance variances of non-PCM and PCM-based heat sinks under different pressure conditions to further improve the design of thermal management modules for satellites.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"236 ","pages":"Article 126384"},"PeriodicalIF":5.0,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664081","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":"Multi-objective optimization of active cooling and compressive load-bearing performance of truss-cored sandwich panel using genetic algorithm","authors":"Shibin Peng ,&nbsp;Yinglong Sheng ,&nbsp;Jiaxin Ren ,&nbsp;Feng Jin ,&nbsp;Shangsheng Feng","doi":"10.1016/j.ijheatmasstransfer.2024.126404","DOIUrl":"10.1016/j.ijheatmasstransfer.2024.126404","url":null,"abstract":"<div><div>Sandwich panels with truss cores offer versatile capabilities, such as heat dissipation and load-bearing, making them promising options for multifunctional applications. However, optimizing thermal and mechanical performance often requires different structural parameters for the sandwich cores. Therefore, it is necessary to balance thermal and mechanical performance during structural design. In this study, a pyramid lattice-cored sandwich panel was evaluated under simultaneous thermal and pressure loads. The multifunctional design of the sandwich panel was optimized using the NSGA-II algorithm to enhance active cooling efficiency, load-bearing capacity, and lightweight index. The design variables included core parameters such as strut diameter, inclination angle, and core height. The active cooling performance of the sandwich panel was assessed using CFD simulation with the <em>k</em>-<em>ω</em> SST turbulence model. Meanwhile, the compressive load-bearing capacity and lightweight index were evaluated using theoretical relations. To validate the optimization results, forced convection experiments and quasi-static out-of-plane compression tests were conducted. From the Pareto solutions predicted by the NSGA-II algorithm, the optimal design point was identified. The predicted heat transfer coefficient and collapse strength of the optimal design were within 15 % and 6.3 %., respectively, of the experimental data. Compared to the initial design, the optimal design increased the heat transfer coefficient by 79.1 % and the collapse strength by 40.6 %, while maintaining nearly the same relative density.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"236 ","pages":"Article 126404"},"PeriodicalIF":5.0,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664067","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":"Heat transfer enhancement for electro-thermo-convection of FENE-P viscoelastic fluid in a square cavity","authors":"Bo Guo ,&nbsp;Rong Liu ,&nbsp;Xinhui Si","doi":"10.1016/j.ijheatmasstransfer.2024.126390","DOIUrl":"10.1016/j.ijheatmasstransfer.2024.126390","url":null,"abstract":"<div><div>This study numerically investigates the heat transfer enhancement for viscoelastic electro-thermo-convection in a two-dimensional differentially heated cavity with injection from below. The flow motion is assumed to be incompressible, which is driven by the Coulomb force and the thermal buoyant force. The polymers are described by the FENE-P model which exhibits typical shear-thinning and elastic properties. Based on the extensibility parameter (<span><math><mi>L</mi></math></span>), the cases are divided into several scenarios, corresponding to weak elasticity with strong shear-thinning, moderate elasticity with moderate shear-thinning, and strong elasticity with weak shear-thinning, respectively. We find that the competition between the shear-thinning and elasticity dominates the flow state and heat transport. The shear-thinning effect tends to facilitate heat transfer, while its elastic properties tend to decrease it. In the scenario of weak elasticity with strong shear-thinning (<span><math><mrow><msup><mrow><mi>L</mi></mrow><mrow><mn>2</mn></mrow></msup><mo>=</mo><mn>10</mn></mrow></math></span>), the polymer additives significantly improve the heat transfer enhancement (HTE) of the electric field as the polymer viscosity ratio (<span><math><mi>β</mi></math></span>) decreases or Weissenberg number (<span><math><mrow><mi>W</mi><mi>i</mi></mrow></math></span>) increases, where the maximum HTE reaches around 92.1%. The amount of HTE first increases rapidly with <span><math><mrow><mi>W</mi><mi>i</mi></mrow></math></span> but then remains almost constant once a critical <span><math><mrow><mi>W</mi><mi>i</mi></mrow></math></span> is exceeded. However, the HTE significantly decreases in the scenario of strong elasticity with weak shear-thinning (<span><math><mrow><mn>300</mn><mo>≤</mo><mi>L</mi><mo>≤</mo><mn>1000</mn></mrow></math></span>) since the elasticity dominates over the shear-thinning. These heat transfer performances are then corroborated with the boundary layer and kinetic energy budget analysis.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"236 ","pages":"Article 126390"},"PeriodicalIF":5.0,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664079","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":"The Coupling Effect of Surface Vibration and Micro-structure on Spray Cooling Heat Transfer","authors":"Xinwen Chen ,&nbsp;Aimin Du ,&nbsp;Meng Zhang ,&nbsp;Zhaohua Li ,&nbsp;Kun Liang ,&nbsp;Yuqi Qian","doi":"10.1016/j.ijheatmasstransfer.2024.126409","DOIUrl":"10.1016/j.ijheatmasstransfer.2024.126409","url":null,"abstract":"<div><div>Although existing studies have emphasized the effects of micro-structured surfaces and vibration conditions on spray cooling efficiency. However, there is a research gap on how the coupling effect of these two factors affects spray cooling heat transfer. Therefore, in this study, the heat dissipation capacity of spray cooling under different vibration and microstructure size conditions is investigated experimentally using commercial HFE-649 as the coolant. The coolant is an electronic fluid with a global warming potential of only 1. Its low boiling point (49°C), which facilitates the early realisation of the phase change process, has a high potential for application in thermal management systems. The study reveals that both vibration and micro-structured surfaces significantly enhance the heat flux and heat transfer coefficient (HTC) in spray cooling. The combined effect of vibration and microstructures results in a more pronounced enhancement of cooling capacity, with the HTC increasing by 44% compared to a static smooth surface. As the vibration frequency and the side length (<span><math><mi>w</mi></math></span>) of the square fins on the micro-structured surface increase, the heat flux, HTC, critical heat flux (CHF), cooling efficiency, and heat transfer enhancement ratio (HTER) all show an increasing trend. However, at high vibration Reynolds numbers (<span><math><mrow><mi>R</mi><msub><mi>e</mi><mi>v</mi></msub></mrow></math></span>) (15708) and the <span><math><mi>w</mi></math></span> of the square fins of 0.8mm and 1.0mm, there is a notable decline in spray cooling capacity due to the excessively high <span><math><mrow><mi>R</mi><msub><mi>e</mi><mi>v</mi></msub></mrow></math></span> enhances the reciprocating motion of the liquid film, causing the film to inadequately spread and continuously accumulate around the edges. A correlation for heat dissipation capability of spray cooling under the coupled effects of vibration and micro-structured surfaces was derived and fitted, with the error in CHF within 12%.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"236 ","pages":"Article 126409"},"PeriodicalIF":5.0,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664080","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 bubble interaction in a temporal and spatial heat flux partitioning model for subcooled flow boiling","authors":"Shihao Yang ,&nbsp;Bo Ren ,&nbsp;Lixin Yang ,&nbsp;Chong Chen ,&nbsp;Qi Lu ,&nbsp;Zonglan Wei ,&nbsp;Jian Deng","doi":"10.1016/j.ijheatmasstransfer.2024.126389","DOIUrl":"10.1016/j.ijheatmasstransfer.2024.126389","url":null,"abstract":"<div><div>CFD methodology for subcooled flow boiling is significantly affected by the heat flux partitioning model, which plays a crucial role in predicting the mass source term generated by wall boiling of the liquid phase. Although numerous models have been proposed, most research efforts have focused on the spatial dimensions of boiling heat transfer mechanisms, neglecting the temporal aspect. This study presents a heat flux partitioning model for subcooled flow boiling that considers both temporal and spatial dimensions. The model accounts for the contribution of heat flux from the superheated liquid layer during the bubble growth stage, liquid convection during the bubble wait stage within the bubble influence area in the temporal dimension, and heat flux from the overlapping area of bubble influence in the spatial dimension. An approach was developed to determine the bubble influence area by considering the bubble interaction based on the stochastic nature of nucleation sites on the heated wall, verified by the Monte Carlo method. The bubble dynamics parameters were experimentally derived to reduce the uncertainty associated with the boiling sub-models on the calculation. A comparative analysis of boiling curves and wall heat flux partitioning was conducted between the present model and the RPI model under various flow conditions. The results indicate that both models could reasonably predict the boiling curve. However, the RPI model tends to over-predict the proportion of evaporative heat flux, which is considered a weakness. Based on physical principles, the present model accurately captures the fundamental trend of wall heat flux partitioning. This research enhances the understanding of subcooled flow boiling and increases confidence in multiphase CFD methodology predictions.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"236 ","pages":"Article 126389"},"PeriodicalIF":5.0,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664065","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":"Strain-driven anisotropic enhancement in the thermal conductivity of KCaBi: the role of optical phonons","authors":"Xue-Kun Chen ,&nbsp;Yue Zhang ,&nbsp;Qing-Qing Luo ,&nbsp;Pin-Zhen Jia ,&nbsp;Wu-Xing Zhou","doi":"10.1016/j.ijheatmasstransfer.2024.126364","DOIUrl":"10.1016/j.ijheatmasstransfer.2024.126364","url":null,"abstract":"<div><div>Acoustic phonons have long been believed to dominate the lattice thermal conductivity (<span><math><msub><mi>κ</mi><mi>l</mi></msub></math></span>) and the contribution of optical phonons can be neglected in crystal structures. KCaBi, as a high-throughput screening semiconductor with ultralow <span><math><msub><mi>κ</mi><mi>l</mi></msub></math></span> [J. Am. Chem. Soc. 144, 4448 (2022)], has been demonstrated that the contribution of optical phonons plays an important role in thermal transport. In this work, by solving the Boltzmann transport equation, it is found that the <span><math><msub><mi>κ</mi><mi>l</mi></msub></math></span> of KCaBi is 2.2 at 300K, with acoustic phonons dominating the z-direction <span><math><msub><mi>κ</mi><mi>l</mi></msub></math></span> and optical phonons contributing around 50% to the x-direction <span><math><msub><mi>κ</mi><mi>l</mi></msub></math></span> under the four-phonon picture. The uncommon contribution of optical phonons also manifests the possibility of tuning the <span><math><msub><mi>κ</mi><mi>l</mi></msub></math></span> anisotropy based on optical phonons. Following this line of thinking, it is found that applying tensile strain can cause a more pronounced decrease of acoustic phonon contribution than that of optical counterpart due to the highly dispersive optical branches, thus enhancing the anisotropic ratio of <span><math><msub><mi>κ</mi><mi>l</mi></msub></math></span>. Moreover, the microscopic mechanism is elucidated by analyzing the phonon dispersion relation, phonon mode-wise contribution and phonon scattering rates. Our study could provide appealing alternatives for the regulation of phonon transport from the viewpoint of optical phonons.</div></div>","PeriodicalId":336,"journal":{"name":"International Journal of Heat and Mass Transfer","volume":"236 ","pages":"Article 126364"},"PeriodicalIF":5.0,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142664068","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}