Journal of Heat Transfer-transactions of The Asme最新文献_第7页

Thermal Hydraulic Performance Of A Turbulent Wall Jet Flowing Over A Wavy Wall 紊流壁面射流在波浪壁面上的热工性能

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-05-23 DOI: 10.1115/1.4062601

A. Kumari, Amitesh Kumar

{"title":"Thermal Hydraulic Performance Of A Turbulent Wall Jet Flowing Over A Wavy Wall","authors":"A. Kumari, Amitesh Kumar","doi":"10.1115/1.4062601","DOIUrl":"https://doi.org/10.1115/1.4062601","url":null,"abstract":"\u0000 The thermal and fluid flow characteristics have been studied numerically for the partial wavy wall. The partial wall is created by giving a segment of wall a wavy pattern from the leading edge followed by the plane wall; the wavy wall segment varies from 10% to 100% of the wall. The amplitude of wavy surface has also been varied from 0.2a to 0.8a with the interval of 0.2a, where ‘a’ is the nozzle height. The results of the present problem have been compared with the results of fully plane wall jet. The Reynolds number at the nozzle exit is constant, i.e. 15000 for all the cases in order to achieve fully turbulent jet. To solve this problem, low Reynolds number RNG model has been used. The results obtained from the present study show that the heat transfer rate remains almost same for 10% to 100 % wavy wall for 0.2a amplitude. In the case of amplitude 0.8a, the heat transfer rate is maximum for 30% wavy wall case; the heat transfer rate reduces further for higher wavy wall %. There is a 26.27% increment in heat transfer for the 30% wavy wall with 0.8a amplitude relative to the fully plane wall jet. The maximum increment in the thermal hydraulic performance (THP) of 5.3% is achieved for 70% wavy wall portion for 0.8a amplitude and it remains the same for further increase in the % of wavy wall.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"57 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76929652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Semi-Numerical Investigation Of Boundary Layer Flow And Heat Transfer Of Mhd Nano-Fluid Flow In Presence Of Chemical Reaction Over A Non-Isothermal Porous Medium 非等温多孔介质上存在化学反应时Mhd纳米流体边界层流动和传热的半数值研究

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-05-23 DOI: 10.1115/1.4062602

V. Awati, Akash Goravar, M. N.

引用次数: 0

Revisiting Forced Convective Enhanced Heat Transfer In Offset-Strip-Fin Cores And Rationalized Performance Prediction Correlations 重新研究偏置带状翅片核心的强制对流强化传热和合理化的性能预测相关性

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-05-18 DOI: 10.1115/1.4062567

Kuan-ting Lin, Dantong Shi, M. Jog, R. M. Manglik

{"title":"Revisiting Forced Convective Enhanced Heat Transfer In Offset-Strip-Fin Cores And Rationalized Performance Prediction Correlations","authors":"Kuan-ting Lin, Dantong Shi, M. Jog, R. M. Manglik","doi":"10.1115/1.4062567","DOIUrl":"https://doi.org/10.1115/1.4062567","url":null,"abstract":"\u0000 The development of rationalized correlations for f and j for forced air-flow convection in rectangular offset-strip-fin cores is presented in this study with 100 ≤ Re ≤ 8000. New experimental data and three-dimensional conjugate heat transfer computational simulations were acquired to understand the flow physics and heat transfer phenomena. The offset arrangement of the fins disrupts the fully-developed condition prevalent in plain fins to promote secondary flow and enhanced heat transfer, and this effect is found to be fundamentally scaled by offset length ratio λ (=l/dh. Furthermore, because of the blunt surface edge or finite thickness of the offset fin, the flow stagnation and wake effects are integral parts to the secondary flow. The influence is found to be characterized by the thickness ratio ζ (=tRe/dh) as well as the rectangular flow cross-section aspect ratio α (=s/hf. New models are proposed for f and j in both laminar and turbulent regimes based on the enhanced convection effects, which are represented by these scaling parameters, and are superimposed on the fully-developed condition in a rectangular channel. The correlations are thereby devised from the new sets of experimental data as well as that given in the open literature, and thus cover a wide range of λ, ζ, and α. Because the transition from laminar to turbulent regimes is smooth and continuous, the general correlations of f and j are developed by asymptotic matching as single expressions and are shown to predict the extended dataset to within ±20%.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"95 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86982331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect Of Rib Blockage Ratio And Arrangements On Impingement Heat Transfer In Double-Wall Cooling 肋堵比及布置对双壁冷却冲击换热的影响

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-05-18 DOI: 10.1115/1.4062566

D. Kong, Zhenyuan Ma, Wei Li, Tao Guo, Cun-liang Liu

{"title":"Effect Of Rib Blockage Ratio And Arrangements On Impingement Heat Transfer In Double-Wall Cooling","authors":"D. Kong, Zhenyuan Ma, Wei Li, Tao Guo, Cun-liang Liu","doi":"10.1115/1.4062566","DOIUrl":"https://doi.org/10.1115/1.4062566","url":null,"abstract":"\u0000 A numerical study was conducted on the multiple jet impingement heat transfer of the double-wall cooling with high blockage ratio ribs of various configurations. Three different blockage ratios (BR = 0.2, 0.3, and 0.5) and two rib arrangements relative to the effusion holes (l/Sx = 0.25 and 0.75) were thoroughly examined using the RANS method with the SST-KIC turbulence model, considering the Kato-Launder modification, intermittency and crossflow transition effects. The ratio of jet-to-target plate spacing to jet diameter (H/d) was fixed to be 1, and Reynolds numbers varied in the range of 4,000-16,000. Furthermore, the computed data on the rib roughed wall were also compared with those on a flat plate for the double-wall cooling. The results demonstrate that the installation of the high blockage ribs significantly decreases the detrimental crossflow effect due to the blockage effect of the ribs and intensively disturbs the jet flow in flow passing over the ribs, thereby enhancing the heat transfer performance. For the impingement/effusion cooling, the arrangement of the rib downstream of the effusion holes (l/Sx = 0.25) shows more advantages, and the heat transfer level rises quickly as BR increases. The best thermal-hydraulic performance and heat transfer uniformity on the rib roughed target plate are both obtained at BR = 0.3, which can be increased by up to 10% and 8%, respectively, compared to those on the flat plate.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72869043","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Numerical Simulation of Mixed Convection Cooling of Electronic Component within a Lid-driven Cubic Cavity Filled with Nanofluid 含纳米流体的盖驱动立方腔内电子元件混合对流冷却的数值模拟

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-05-18 DOI: 10.1115/1.4062564

Soufiane Nouari, Mustapha Ait Hssain, Zakaria Lafdaili, Sakina El Hamdani, H. Doghmi

{"title":"Numerical Simulation of Mixed Convection Cooling of Electronic Component within a Lid-driven Cubic Cavity Filled with Nanofluid","authors":"Soufiane Nouari, Mustapha Ait Hssain, Zakaria Lafdaili, Sakina El Hamdani, H. Doghmi","doi":"10.1115/1.4062564","DOIUrl":"https://doi.org/10.1115/1.4062564","url":null,"abstract":"\u0000 This study investigates the effect of the movement of a moving lid on the heat transfer and cooling of three isothermal blocks inside a cubic enclosure filled with a Cu-water nanofluid. The study's geometry is three-dimensional with three blocks which are assumed to have a fixed hot temperature TH. The study considers two cases for the movement of the upper lid: one where the lid moves in the longitudinal direction, and another where it moves in the transverse direction. The dimensionless governing equations considering the boundary conditions are solved by implementing the finite volume approach with the power low as a resolution scheme. The study varies several factors such as the shape of the nanofluid, the shape factor of the blocks (3L/4, L/2, and L/4), the number of cold walls, the Richardson number (0.01 to 10), the volume fraction of nanoparticles (0 to 0.06), at a fixed Grashof number (104). The results indicate that decreasing the Richardson number improves the heat transfer coefficient's performance. Also, the study finds that longitudinal movement provides better block cooling compared to transverse movement. Additionally, changing the height of the blocks from L/4 to 3L/4 resulted in a decrease in heat transfer inside the cavity. As stated, the research aimed to investigate the impact of different directions of lid movement on the cooling of heater blocks, with the goal of enhancing the thermal performance and heat transfer efficiency of various technical engineering equipment.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84209196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental Thermal Performance Of Pcm Embedded Solar Air Heater Employing Impinging Stable Air Jet Array Presenting High Power And Energy Density 采用高功率、高能量密度冲击稳定射流阵列的Pcm嵌入式太阳能空气加热器的热性能实验研究

4区工程技术

Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-05-18 DOI: 10.1115/1.4062565

S. Chaurasiya, Satyender Singh

{"title":"Experimental Thermal Performance Of Pcm Embedded Solar Air Heater Employing Impinging Stable Air Jet Array Presenting High Power And Energy Density","authors":"S. Chaurasiya, Satyender Singh","doi":"10.1115/1.4062565","DOIUrl":"https://doi.org/10.1115/1.4062565","url":null,"abstract":"\u0000 This experimental thermal performance investigation presents that the hot air at a significant high temperature, and simultaneously at high power density and energy density of PCM can be obtained utilizing a novel design of PCM embedded solar air heater employing impinging stable air jet array. Investigation is carried out following two main objectives, i.e., to obtain (i) instant and (ii) long thermal backups. In the reported design configuration, impinging stable air jets on absorber plate are obtained by reducing the flow path of expelled air from upstream air jets that increased the heat transfer rate to air and consequently instant thermal backup. Although, the use of wavy PCM unit provides instant and long thermal backup by increasing heat transfer area that augments the heat transfer to air and the collection of solar radiations, respectively. Moreover, the present study is extended as follows, (i) the use of shutter on glass cover to increase thermal performance during nocturnal hours, (ii) charging of PCM till the maximum solar radiation hours and use the stored energy during nocturnal hours, (iii) thermal performance analysis to reveal instant thermal backup, (iv) thermal performance investigation during variable weather conditions, and (v) thermal performance investigation for low ambient air temperature. The obtained results revealed that for the unit collector area, significant thermal backup of about 6 hours at a temperature rise of =5oC can be obtained by utilizing the above-mentioned provisions in this research.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76587792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Numerical Investigation of Conjugate Natural Convection From a Vertical Cylindrical Open Cavity 垂直圆柱开口腔内共轭自然对流的数值研究

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-04-27 DOI: 10.1115/1.4062428

Shafiq Mohamad, S. Rout, J. Senapati, S. Sarangi

{"title":"Numerical Investigation of Conjugate Natural Convection From a Vertical Cylindrical Open Cavity","authors":"Shafiq Mohamad, S. Rout, J. Senapati, S. Sarangi","doi":"10.1115/1.4062428","DOIUrl":"https://doi.org/10.1115/1.4062428","url":null,"abstract":"\u0000 An extensive numerical analysis is performed on a vertical cylindrical open cavity made of aluminum with multiple thicknesses for conjugate natural convection. The key purpose of this study is to evaluate cylinder wall thickness effect on the natural convection at outer wall cylinder, which is coupled to inner cylinder wall that has a stable temperature of 450 K and the ambient air which temperature is 300 K. The Navier-Stokes equations, continuity equation and energy equations are solved numerically. The finite volume method is applied in the computational domain that includes the vertical cylindrical open cavity by using Ansys-Fluent 18 to specify the properties of flow and exchange of thermal energy. Couple of pertinent parameters are used for the numerical investigation like Rayleigh number within laminar regime (within range 104 to 108), aspect ratio (L/D) of the vertical cylindrical open cavity (2, 4, 6, 8, 10) and cylinder wall thickness (0, 1, 2, 3, 4 mm). This study presents the velocity vector field and thermal plume contours. An approximate Nusselt number to Rayleigh number equation is developed for the vertical cylindrical cavity within the range of Rayleigh numbers addressed by this work","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83502626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Heat Transfer and Pressure Loss of Turbulent Flow in a Wedge-Shaped Cooling Channel with Different Types of Triply Periodic Minimal Surfaces 不同类型三周期极小面楔形冷却通道湍流的传热和压力损失

4区工程技术

Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-04-27 DOI: 10.1115/1.4062429

K. Yeranee, Y. Rao

{"title":"Heat Transfer and Pressure Loss of Turbulent Flow in a Wedge-Shaped Cooling Channel with Different Types of Triply Periodic Minimal Surfaces","authors":"K. Yeranee, Y. Rao","doi":"10.1115/1.4062429","DOIUrl":"https://doi.org/10.1115/1.4062429","url":null,"abstract":"\u0000 Additive manufacturing (AM) enables highly efficient cooling fabrications such as Triply Periodic Minimal Surface (TPMS), which provides excellent heat transfer per unit volume. In a wedge-shaped channel representing trailing edge turbine blade cooling, conventional pin fins are replaced with different TPMS structures due to their topological features to enhance the flow mixing and heat transfer, strengthen the structural integrity, and reduce the manufacturing material. The turbulent flow and heat transfer characteristics of solid- and sheet-based TPMS models, including Gyroid, Diamond and IWP, are numerically investigated. The heat transfer, pressure loss and thermal performance are compared at Reynolds numbers of 10,000-30,000. Notably, among the studied TPMS structures, the Diamond-sheet structure is selected as the optimal model. Compared to the baseline pin fin structure at an equal Reynolds number, it remarkably increases the overall heat transfer by up to 163.2%, the pressure loss by 181.8%, and the thermal performance by up to 77.3%. The numerical results indicate that the Gyroid- and Diamond-sheet structures effectively organize and interact with the cooling fluid, reducing low-velocity recirculation flow in the tip region of the trailing edge. The flow in the Diamond-sheet network is distributed more evenly from the root to the tip region, improving the temperature uniformity throughout the channel. Overall, the Diamond-sheet TPMS structure could effectively improve the heat transfer performance, temperature uniformity, and structural integrity in the turbine blades trailing edge, thereby potentially extending the durability of the turbine blades.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"1190 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72741886","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Enhanced Boiling Heat Transfer of T-shaped Finned Tubes: Experiment and Simulation t形翅片管强化沸腾换热:实验与模拟

4区工程技术

Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-04-17 DOI: 10.1115/1.4062331

Peishan Ding, Jianmin Xu, Lingfeng Pan, Haibo Tan, Xiaotao Zheng

{"title":"Enhanced Boiling Heat Transfer of T-shaped Finned Tubes: Experiment and Simulation","authors":"Peishan Ding, Jianmin Xu, Lingfeng Pan, Haibo Tan, Xiaotao Zheng","doi":"10.1115/1.4062331","DOIUrl":"https://doi.org/10.1115/1.4062331","url":null,"abstract":"\u0000 Tubes with enhanced surface usually have high boiling heat transfer coefficients which can greatly improve the heat transfer performance under the condition of pool nucleate boiling. In this paper, the boiling heat transfer enhancement behavior was carried out for T-shaped finned tubes, improved T-shaped finned tubes, trapezoidal finned tubes and smooth tubes. The heat transfer enhancement mechanism in high boiling medium with different fin shapes was explored. Experimental data show that the boiling heat transfer coefficients of finned tubes with different shapes are 1.4 to 3 times higher than that of the smooth tubes in the same heat load range. Moreover, the tested results were fitted by the correlation formula of heat transfer coefficient, which can provide guidance for industrial applications. Furthermore, combined with the field coordination theory, the heat transfer characteristics of machining finned tubes were obtained by the software of Fluent. The simulated enhanced heat transfer performances under different heat transfer flux are in good agreement with experimental data. Interestingly, the vapor phase volume fraction of the finned tube is almost 5 times that of the smooth tube.","PeriodicalId":15937,"journal":{"name":"Journal of Heat Transfer-transactions of The Asme","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73343766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Errata for Ht-21-1357 Ht-21-1357勘误表

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Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-04-12 DOI: 10.1115/1.4062308

Michael Hayes

引用次数: 0