ASME journal of heat and mass transfer最新文献_第3页

Effects of Flow Pulsation and Surface Geometry On Heat Transfer Performance in a Channel with Teardrop-shaped Dimples Investigated by Large Eddy Simulation 通过大涡流模拟研究流动脉动和表面几何形状对带有泪滴状凹坑的通道传热性能的影响

ASME journal of heat and mass transfer Pub Date : 2024-02-13 DOI: 10.1115/1.4064735

K. Inokuma, Yuki Yawata, A. Murata, K. Iwamoto

{"title":"Effects of Flow Pulsation and Surface Geometry On Heat Transfer Performance in a Channel with Teardrop-shaped Dimples Investigated by Large Eddy Simulation","authors":"K. Inokuma, Yuki Yawata, A. Murata, K. Iwamoto","doi":"10.1115/1.4064735","DOIUrl":"https://doi.org/10.1115/1.4064735","url":null,"abstract":"\u0000 Large eddy simulation was performed to investigate heat transfer performance of a pulsating flow over teardrop-shaped dimples. A total of six geometries of dimpled surfaces were examined for dimple arrangements of in-line/staggered/original and dimple inclination angle of 0-60 deg. Pulsating flows were generated by sinusoidally varying the volume-averaged velocity. The pulsation frequency and amplitude were changed for the Strouhal number of 0-0.60 and the root-mean-square velocity amplitude normalized by the bulk flow velocity of 0-0.14. The results showed that the surface-averaged Nusselt number and friction factor were larger for the pulsating flow case than those for the steady flow case. The surface-averaged Nusselt number ratio and the friction factor increased with the Strouhal number up to the Strouhal number of 0.30. For the Strouhal number larger than 0.30, they decreased with the Strouhal number or stayed almost constant. Consequently, the heat transfer efficiency index increased with the Strouhal number. The increase in the local Nusselt number ratio due to the flow pulsation was observed at the leading-edge region of the dimples. The results of the streamlines near the dimple showed that the swirling separation bubble was located closer to the leading-edge region due to the pulsation, which resulted in the increase of the absolute values of the turbulent heat flux and the local Nusselt number ratio.","PeriodicalId":510895,"journal":{"name":"ASME journal of heat and mass transfer","volume":"63 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139781574","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}

引用次数: 0

High Power Density Thermal Energy Storage with Phase Change Material in Enhanced Compact Heat Exchangers 在增强型紧凑热交换器中使用相变材料实现高功率密度热能存储

ASME journal of heat and mass transfer Pub Date : 2024-02-09 DOI: 10.1115/1.4064710

Sarath Kannan, M. Jog, R. M. Manglik

{"title":"High Power Density Thermal Energy Storage with Phase Change Material in Enhanced Compact Heat Exchangers","authors":"Sarath Kannan, M. Jog, R. M. Manglik","doi":"10.1115/1.4064710","DOIUrl":"https://doi.org/10.1115/1.4064710","url":null,"abstract":"\u0000 Performance of a novel ultracompact thermal energy storage (TES) heat exchanger, designed as a micro-channel finned-tube exchanger is presented. With water as the heating-cooling fluid in the micro-channels, a salt hydrate phase change material (PCM), lithium nitrate trihydrate (LiNO3∙3H2O), was encased on the fin side. To establish the hypothesis that small-length-scale encasement (< 3 mm) of PCM substantially enhances heat transfer to yield very high power-density energy storage, heat exchanger designs with 10 and 24 fins/inch were considered. They were subjected to thermal cycling, or repeated heating (melting) and cooling (freezing), with inlet fluid flow mimicking diurnal variation between 42? - 25? (representing typical arid-region conditions) over an accelerated time period. By employing salt self-seeding to obviate subcooling during cooling or recrystallization, the TES was found to exhibit stable long-term (100 heating-cooling cycles) operation with very high PCM-side heat transfer coefficients (~ 100-500 W/m2∙K) and storage power density (~ 160-175 kW/m3). In fact, with optimization of heating-cooling fluid flow rate for given charging-discharging time period and exchanger size, power density > 300 kW/m3 can be achieved. The results clearly establish that highly compact heat exchangers used as TES units can provide very high-performance alternatives to conventional ones.","PeriodicalId":510895,"journal":{"name":"ASME journal of heat and mass transfer","volume":" 41","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139790743","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}

引用次数: 0

Evaluation by Liquid Crystal Thermography of Transient Surface Temperature Distribution in Radiant Floor Cooling Applications and Assessment of Analytical and Numerical Models 用液晶热成像技术评估辐射地板冷却应用中的瞬态表面温度分布以及对分析和数值模型的评估

ASME journal of heat and mass transfer Pub Date : 2024-02-09 DOI: 10.1115/1.4064707

Marco Bizzarri, Paolo Conti, L. Glicksman, E. Schito, D. Testi

{"title":"Evaluation by Liquid Crystal Thermography of Transient Surface Temperature Distribution in Radiant Floor Cooling Applications and Assessment of Analytical and Numerical Models","authors":"Marco Bizzarri, Paolo Conti, L. Glicksman, E. Schito, D. Testi","doi":"10.1115/1.4064707","DOIUrl":"https://doi.org/10.1115/1.4064707","url":null,"abstract":"\u0000 The purpose of our study is to evaluate the surface temperature distribution on a radiant floor, particularly focusing on space cooling operations, to assess the presence of non-uniformities. In fact, knowing the temperature difference between the average superficial temperature and the coldest spot can be a useful indication for condensation prevention. Primarily, we performed an experimental campaign in test rooms using temperature sensors and liquid crystal thermography. This allowed us to evaluate the floor temperature distribution both on a local scale, influenced by the discontinuous presence of buried water pipes, and on a macro scale, influenced by internal use, objects, and boundary conditions of the surrounding space. Then, the experimental temperature field on the radiant floor surface has been compared with analytical and numerical models in steady-state and transient phases, respectively. The results indicate limited superficial temperature variations that become more significant at larger tube spacings and under transient conditions. In particular, the numerical transient analysis showed that shortly after a step change in the pipe's temperature boundary condition, a larger variation is locally observable on the floor, which then decays to the new steady-state conditions, presenting more uniformity. However, local effects are generally overshadowed by macro effects, especially for practical scenarios where many objects, furnishings, and different boundary conditions are present. Finally, as a conservative guideline for the cooling system control, we recommend maintaining the average superficial floor temperature at least 1°C above the dew point, to account for the described non-uniformities.","PeriodicalId":510895,"journal":{"name":"ASME journal of heat and mass transfer","volume":"163 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139849795","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}

引用次数: 0

High Power Density Thermal Energy Storage with Phase Change Material in Enhanced Compact Heat Exchangers 在增强型紧凑热交换器中使用相变材料实现高功率密度热能存储

ASME journal of heat and mass transfer Pub Date : 2024-02-09 DOI: 10.1115/1.4064710

Sarath Kannan, M. Jog, R. M. Manglik

{"title":"High Power Density Thermal Energy Storage with Phase Change Material in Enhanced Compact Heat Exchangers","authors":"Sarath Kannan, M. Jog, R. M. Manglik","doi":"10.1115/1.4064710","DOIUrl":"https://doi.org/10.1115/1.4064710","url":null,"abstract":"\u0000 Performance of a novel ultracompact thermal energy storage (TES) heat exchanger, designed as a micro-channel finned-tube exchanger is presented. With water as the heating-cooling fluid in the micro-channels, a salt hydrate phase change material (PCM), lithium nitrate trihydrate (LiNO3∙3H2O), was encased on the fin side. To establish the hypothesis that small-length-scale encasement (< 3 mm) of PCM substantially enhances heat transfer to yield very high power-density energy storage, heat exchanger designs with 10 and 24 fins/inch were considered. They were subjected to thermal cycling, or repeated heating (melting) and cooling (freezing), with inlet fluid flow mimicking diurnal variation between 42? - 25? (representing typical arid-region conditions) over an accelerated time period. By employing salt self-seeding to obviate subcooling during cooling or recrystallization, the TES was found to exhibit stable long-term (100 heating-cooling cycles) operation with very high PCM-side heat transfer coefficients (~ 100-500 W/m2∙K) and storage power density (~ 160-175 kW/m3). In fact, with optimization of heating-cooling fluid flow rate for given charging-discharging time period and exchanger size, power density > 300 kW/m3 can be achieved. The results clearly establish that highly compact heat exchangers used as TES units can provide very high-performance alternatives to conventional ones.","PeriodicalId":510895,"journal":{"name":"ASME journal of heat and mass transfer","volume":"116 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139850635","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}

引用次数: 0

Heat Transfer and Flow Characteristics of Channel Impingement Cooling Structure at Leading Edge Inside Turbine Blades Using Large Eddy Simulation 利用大涡模拟研究涡轮叶片内前缘通道撞击冷却结构的传热和流动特性

ASME journal of heat and mass transfer Pub Date : 2024-02-09 DOI: 10.1115/1.4064706

Huihui Wang, Qinghua Deng, Zhenping Feng

{"title":"Heat Transfer and Flow Characteristics of Channel Impingement Cooling Structure at Leading Edge Inside Turbine Blades Using Large Eddy Simulation","authors":"Huihui Wang, Qinghua Deng, Zhenping Feng","doi":"10.1115/1.4064706","DOIUrl":"https://doi.org/10.1115/1.4064706","url":null,"abstract":"\u0000 As a main part of multi-channel wall jet cooling structure, channel impingement cooling is a cooling strategy of great concern at the leading edge inside of the turbine blade. In this paper, heat transfer and flow behavior in the channel impingement cooling structure are investigated by Large Eddy Simulation (LES). The results imply that impingement created by curvature-induced centrifugal instabilities in the turning region of the cooling channel is dominated by a streamwise vortex system containing a counter-rotating Dean vortex, which presents high heat transfer streaks along the streamwise direction on the target wall. The intensely unsteady nature of the cooling jet induced by a lack of equilibrium between the pressure gradient and the centrifugal force are precisely captured herein by LES. An attaching-wall jet formed on the outer wall downstream of the cooling channel has highly three-dimensional characteristics not observed by Reynolds-averaged Navier-Stokes equations (RANS). Heat transfer augmentation on the target wall of the cooling channel is mainly due to the intensifying streamwise vortex system developing in the turning region as driven by the centrifugal force. This research work will provide a reference for the optimization and application of multi-channel wall jet cooling for gas turbine blades.","PeriodicalId":510895,"journal":{"name":"ASME journal of heat and mass transfer","volume":" 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139790280","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}

引用次数: 0

Microscale Surface Defects Influence on Thermally Sprayed Alumina Droplets Deformation Dynamics 微尺度表面缺陷对热喷涂氧化铝液滴变形动力学的影响

ASME journal of heat and mass transfer Pub Date : 2024-02-09 DOI: 10.1115/1.4064708

Aleksandra Nastic, Larry Pershin, Prof. Javad Mostaghimi

{"title":"Microscale Surface Defects Influence on Thermally Sprayed Alumina Droplets Deformation Dynamics","authors":"Aleksandra Nastic, Larry Pershin, Prof. Javad Mostaghimi","doi":"10.1115/1.4064708","DOIUrl":"https://doi.org/10.1115/1.4064708","url":null,"abstract":"\u0000 During plasma spraying, interaction between splats and surface micro-sized features can be critical to the splat dynamic progress and consequently to the coating microstructural development and interfacial bonding. The transient spreading of molten alumina impacting a flat substrate exhibiting micro-obstructions, commonly produced during surface machining, grinding and/or even polishing, is numerically investigated using a three-dimensional model comprising of splat solidification and shrinkage developments. Single isolated splats are also experimentally characterized using top surface scanning electron microscope (SEM) analysis.\u0000 Droplets impacting directly onto a micro-sized surface protuberance show no signs of pre-mature splashing behavior. The microscopic features (˂5µm) are not able to generate flow instabilities to initially affect the splat inherent overall spreading. However, subsequent splat peripheral contact with target surface micro-obstructions, characterized by peak and valley features, induces peripheral lift, waviness, and instability. It follows that the ejected destabilized material shears/fractures during stretching triggering the formation of splash fingers. Solidification plays a major role in detracting the role of surface micro-obstructions, i.e. surface roughness, in splashing phenomena.","PeriodicalId":510895,"journal":{"name":"ASME journal of heat and mass transfer","volume":"117 1-2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139848958","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}

引用次数: 0

Microscale Surface Defects Influence on Thermally Sprayed Alumina Droplets Deformation Dynamics 微尺度表面缺陷对热喷涂氧化铝液滴变形动力学的影响

ASME journal of heat and mass transfer Pub Date : 2024-02-09 DOI: 10.1115/1.4064708

Aleksandra Nastic, Larry Pershin, Prof. Javad Mostaghimi

{"title":"Microscale Surface Defects Influence on Thermally Sprayed Alumina Droplets Deformation Dynamics","authors":"Aleksandra Nastic, Larry Pershin, Prof. Javad Mostaghimi","doi":"10.1115/1.4064708","DOIUrl":"https://doi.org/10.1115/1.4064708","url":null,"abstract":"\u0000 During plasma spraying, interaction between splats and surface micro-sized features can be critical to the splat dynamic progress and consequently to the coating microstructural development and interfacial bonding. The transient spreading of molten alumina impacting a flat substrate exhibiting micro-obstructions, commonly produced during surface machining, grinding and/or even polishing, is numerically investigated using a three-dimensional model comprising of splat solidification and shrinkage developments. Single isolated splats are also experimentally characterized using top surface scanning electron microscope (SEM) analysis.\u0000 Droplets impacting directly onto a micro-sized surface protuberance show no signs of pre-mature splashing behavior. The microscopic features (˂5µm) are not able to generate flow instabilities to initially affect the splat inherent overall spreading. However, subsequent splat peripheral contact with target surface micro-obstructions, characterized by peak and valley features, induces peripheral lift, waviness, and instability. It follows that the ejected destabilized material shears/fractures during stretching triggering the formation of splash fingers. Solidification plays a major role in detracting the role of surface micro-obstructions, i.e. surface roughness, in splashing phenomena.","PeriodicalId":510895,"journal":{"name":"ASME journal of heat and mass transfer","volume":" 39","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139789382","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}

引用次数: 0

Thermal Characterization of Subcooled Flow Boiling in a Pin-Fin Coldplate with Non-Uniform Heating 加热不均匀的针翅形冷板中过冷流沸腾的热特性分析

ASME journal of heat and mass transfer Pub Date : 2024-02-09 DOI: 10.1115/1.4064709

A. Osman, Yogendra Joshi

{"title":"Thermal Characterization of Subcooled Flow Boiling in a Pin-Fin Coldplate with Non-Uniform Heating","authors":"A. Osman, Yogendra Joshi","doi":"10.1115/1.4064709","DOIUrl":"https://doi.org/10.1115/1.4064709","url":null,"abstract":"\u0000 Coldplates are a crucial component in various cooling applications, such as cooling data center servers and power electronics. The unprecedented growth in electronics power density, along with the resulting ultra-high heat fluxes, demands a transition from single-phase forced convection to two-phase flow boiling heat transfer. The majority of studies in the literature have focused on flow boiling in fin-enhanced silicon microgaps and microchannels, with only a few addressing flow boiling in millimeter-scale heat sinks. In the present study, flow boiling of HFE-7200 dielectric fluid in a millimeter-scale pin-fin coldplate is experimentally investigated under non-uniform heating conditions. Four background heaters represent the low-dissipating-power devices. On the other hand, five hotspot heaters mimic the high-heat-flux devices and generate heat fluxes ranging from 50 W/cm2 to 1,000 W/cm2, corresponding to hotspot heat inputs ranging from 62.5 W to 1.25 kW, respectively. The coldplate's thermohydraulic performance is investigated for various flow rates and inlet temperature ranging from 0.5 L/min to 1.5 L/min and from 25°C to 60°C, respectively. A high-speed camera is utilized for a narrow field of view (FOV) flow visualization at a frame rate of 2229 fps, while a digital camera is used for a wider FOV at 60 fps. Flow visualization demonstrated the transition between bubbly, slug/churn, and stratified two-phase flow regimes.","PeriodicalId":510895,"journal":{"name":"ASME journal of heat and mass transfer","volume":" 34","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139789469","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}

引用次数: 0

Thermal Characterization of Subcooled Flow Boiling in a Pin-Fin Coldplate with Non-Uniform Heating 加热不均匀的针翅形冷板中过冷流沸腾的热特性分析

ASME journal of heat and mass transfer Pub Date : 2024-02-09 DOI: 10.1115/1.4064709

A. Osman, Yogendra Joshi

{"title":"Thermal Characterization of Subcooled Flow Boiling in a Pin-Fin Coldplate with Non-Uniform Heating","authors":"A. Osman, Yogendra Joshi","doi":"10.1115/1.4064709","DOIUrl":"https://doi.org/10.1115/1.4064709","url":null,"abstract":"\u0000 Coldplates are a crucial component in various cooling applications, such as cooling data center servers and power electronics. The unprecedented growth in electronics power density, along with the resulting ultra-high heat fluxes, demands a transition from single-phase forced convection to two-phase flow boiling heat transfer. The majority of studies in the literature have focused on flow boiling in fin-enhanced silicon microgaps and microchannels, with only a few addressing flow boiling in millimeter-scale heat sinks. In the present study, flow boiling of HFE-7200 dielectric fluid in a millimeter-scale pin-fin coldplate is experimentally investigated under non-uniform heating conditions. Four background heaters represent the low-dissipating-power devices. On the other hand, five hotspot heaters mimic the high-heat-flux devices and generate heat fluxes ranging from 50 W/cm2 to 1,000 W/cm2, corresponding to hotspot heat inputs ranging from 62.5 W to 1.25 kW, respectively. The coldplate's thermohydraulic performance is investigated for various flow rates and inlet temperature ranging from 0.5 L/min to 1.5 L/min and from 25°C to 60°C, respectively. A high-speed camera is utilized for a narrow field of view (FOV) flow visualization at a frame rate of 2229 fps, while a digital camera is used for a wider FOV at 60 fps. Flow visualization demonstrated the transition between bubbly, slug/churn, and stratified two-phase flow regimes.","PeriodicalId":510895,"journal":{"name":"ASME journal of heat and mass transfer","volume":"97 9-10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139849090","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}

引用次数: 0

Heat Transfer and Flow Characteristics of Channel Impingement Cooling Structure at Leading Edge Inside Turbine Blades Using Large Eddy Simulation 利用大涡模拟研究涡轮叶片内前缘通道撞击冷却结构的传热和流动特性

ASME journal of heat and mass transfer Pub Date : 2024-02-09 DOI: 10.1115/1.4064706

Huihui Wang, Qinghua Deng, Zhenping Feng

{"title":"Heat Transfer and Flow Characteristics of Channel Impingement Cooling Structure at Leading Edge Inside Turbine Blades Using Large Eddy Simulation","authors":"Huihui Wang, Qinghua Deng, Zhenping Feng","doi":"10.1115/1.4064706","DOIUrl":"https://doi.org/10.1115/1.4064706","url":null,"abstract":"\u0000 As a main part of multi-channel wall jet cooling structure, channel impingement cooling is a cooling strategy of great concern at the leading edge inside of the turbine blade. In this paper, heat transfer and flow behavior in the channel impingement cooling structure are investigated by Large Eddy Simulation (LES). The results imply that impingement created by curvature-induced centrifugal instabilities in the turning region of the cooling channel is dominated by a streamwise vortex system containing a counter-rotating Dean vortex, which presents high heat transfer streaks along the streamwise direction on the target wall. The intensely unsteady nature of the cooling jet induced by a lack of equilibrium between the pressure gradient and the centrifugal force are precisely captured herein by LES. An attaching-wall jet formed on the outer wall downstream of the cooling channel has highly three-dimensional characteristics not observed by Reynolds-averaged Navier-Stokes equations (RANS). Heat transfer augmentation on the target wall of the cooling channel is mainly due to the intensifying streamwise vortex system developing in the turning region as driven by the centrifugal force. This research work will provide a reference for the optimization and application of multi-channel wall jet cooling for gas turbine blades.","PeriodicalId":510895,"journal":{"name":"ASME journal of heat and mass transfer","volume":"46 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139850181","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}

引用次数: 0