ASME Journal of Heat and Mass Transfer最新文献_第5页

Turbulent Pulsating Convective Flow in the Quasi-Steady and Low-Frequency Regimes 准稳定和低频状态下的湍流脉动对流

ASME Journal of Heat and Mass Transfer Pub Date : 2024-03-01 DOI: 10.1115/1.4064977

Ayan Banerjee

{"title":"Turbulent Pulsating Convective Flow in the Quasi-Steady and Low-Frequency Regimes","authors":"Ayan Banerjee","doi":"10.1115/1.4064977","DOIUrl":"https://doi.org/10.1115/1.4064977","url":null,"abstract":"\u0000 The instantaneous and time-averaged dynamics of turbulent pulsating convective pipe flow is investigated experimentally over Strohoul number, St=3.3×10−4−0.12 that falls in the quasi-steady and low-frequency regimes, pulsation amplitude, βb=0.05−0.2, and bulk Reynolds numbers, Reb=7528−10920. Analytical expressions for pulsation amplitudes of centerline velocity, bulk velocity and Nusselt number are derived. The time series of fluctuating components of centerline velocity (Uc̃), cross-sectionally averaged bulk velocity (Ub̃) and Nusselt number (Nũ) depics that the phase differences between Uc̃, and Ub̃, and between Ub̃, and Nũ increase with St non-monotically with near zero phase difference at St→0. The time-averaged pulsating Nusselt number Nu¯ is invariant of St for St > 0.01. Nu¯ depends marginally on βb. The relative mean Nusselt number, Nur=Nu¯/Nus<1 for Reb≥8885 and Nur>1 for Reb = 7528. The general observations from this study is that, in the quasi-steady and low-frequency regimes, turbulent pulsating flows leads to marginal changes in the time-averaged Nusselt number Nu¯ compared to the time-averaged Nusselt number Nus in steady flow condition at any Reb.","PeriodicalId":505153,"journal":{"name":"ASME Journal of Heat and Mass Transfer","volume":" 593","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140092520","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

General Solution for a Single-phase Conduction Problem of a Finite-slab with a Growing Or Receding Boundary 具有增长或后退边界的有限板的单相传导问题的一般解法

ASME Journal of Heat and Mass Transfer Pub Date : 2024-02-23 DOI: 10.1115/1.4064829

Pavan Kumar, A. Segall, Corina Drapaca

引用次数: 0

Effect of Porosity Gradient On the Solidification of Paraffin in a Thermal Energy Storage Tank Filled with Metal Foam 孔隙率梯度对填充金属泡沫的热能储存罐中石蜡凝固的影响

ASME Journal of Heat and Mass Transfer Pub Date : 2024-02-23 DOI: 10.1115/1.4064828

Xinyu Gao, Xinyu Huang, Pan Wei, Xiaohu Yang, Sandra Boetcher

{"title":"Effect of Porosity Gradient On the Solidification of Paraffin in a Thermal Energy Storage Tank Filled with Metal Foam","authors":"Xinyu Gao, Xinyu Huang, Pan Wei, Xiaohu Yang, Sandra Boetcher","doi":"10.1115/1.4064828","DOIUrl":"https://doi.org/10.1115/1.4064828","url":null,"abstract":"\u0000 Thermal energy storage (TES) systems are a promising solution for reutilizing industrial waste heat (IWH) for distributed thermal users. These systems have tremendous potential to increase energy efficiency and decrease carbon emissions in both industrial and building sectors. To further enhance the utilization rate of industrial waste heat, optimizing TES systems has attracted significant attention. This study explores the solidification process of a vertical shell-and-tube TES unit with the annulus filled with a composite phase-change material (PCM) comprising paraffin and copper foam. Numerical simulations are employed, which are verified by visualization experiments of the TES unit. To improve the thermal performance of the unit, porous media with non-uniform parameters is implemented. Non-uniform pore structures, featuring radially varying gradients (positive, i.e., porosity increasing in the positive radial direction, and negative, i.e., porosity decreasing in the positive radial direction) that are oriented perpendicular to the flow direction of the inner tube, are compared to uniformly dispersed pore structures. Results indicate that, compared to the uniform structure, the utilization of the positive gradient shortens the time to complete solidification by 15.9% while simultaneously increasing temperature uniformity by 14.6%. In contrast, the negative gradient results in a 5.7% increase in complete solidification time and a 31.0% decrease in temperature uniformity. The optimum gradient porosity combination (0.87-0.94-0.97) is obtained by the response surface method to optimize the structural parameters of the radial gradient porosity.","PeriodicalId":505153,"journal":{"name":"ASME Journal of Heat and Mass Transfer","volume":"15 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140436643","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

Transient Thermal Spreading From a Circular Heat Source in Polygonal Flux Tubes 多边形通量管中圆形热源的瞬态热扩散

ASME Journal of Heat and Mass Transfer Pub Date : 2024-02-23 DOI: 10.1115/1.4064830

Sahar Goudarzi, Lisa Steigerwalt Lam, Y. Muzychka, Greg Naterer

引用次数: 0

Exact Insulated-Tip Fin Length Correction for Tip Convection Compensation 用于尖端对流补偿的精确绝缘尖端鳍片长度校正

ASME Journal of Heat and Mass Transfer Pub Date : 2024-02-23 DOI: 10.1115/1.4064827

Massimo Capobianchi, Richard Cangelosi

引用次数: 0

Analytical Modeling of Thermal Spreading/Constriction From an Isothermal Source Into a Multilayer Orthotropic Semi-Infinite Flux Tube 等温源进入多层各向同性半无限流量管的热扩散/热收缩分析建模

ASME Journal of Heat and Mass Transfer Pub Date : 2024-02-23 DOI: 10.1115/1.4064831

Ankur Jain

{"title":"Analytical Modeling of Thermal Spreading/Constriction From an Isothermal Source Into a Multilayer Orthotropic Semi-Infinite Flux Tube","authors":"Ankur Jain","doi":"10.1115/1.4064831","DOIUrl":"https://doi.org/10.1115/1.4064831","url":null,"abstract":"\u0000 Thermal spreading and constriction have been widely studied due to relevance in heat transfer across interfaces with imperfect contact and problems such as microelectronics thermal management. Much of the past work in this field addresses an iso-flux source, with relatively lesser work on the isothermal source problem, which is of much relevance to heat transfer across rough interfaces. This work presents an analytical solution for thermal spreading/constriction resistance that governs heat flow from an isothermal source into a multilayer orthotropic semi-infinite flux tube. The mixed boundary condition due to the isothermal source is accounted for by writing a convective boundary condition with an appropriately chosen spatially-varying Biot number. A series solution for the temperature field is derived, along with a set of linear algebraic equations for the series coefficients. An expression for the non-dimensional thermal spreading resistance is derived for Cartesian and cylindrical problems. It is shown that, depending on the values of various non-dimensional parameters, heat transfer in either the thin film or the flux tube may dominate and govern the overall thermal spreading resistance. Results for a single-layered isotropic flux tube are derived as a special case of the general result, for which, good agreement with past work is demonstrated. An easy-to-use polynomial fit for this special case is presented. This work contributes a novel technique for solving mixed boundary problems involving an isothermal source. Results may contribute towards solving practical problems involving thermal management and interfacial heat transfer.","PeriodicalId":505153,"journal":{"name":"ASME Journal of Heat and Mass Transfer","volume":"62 19","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140436910","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: 1

Erratum: “Heat Transfer in Flat-Plate Boundary Layers: A Correlation for Laminar, Transitional, and Turbulent Flow” [ASME J. Heat Mass Transfer-Trans. ASME, 2020, 142(6), p. 061805; DOI: 10.1115/1.4046795] 勘误："平板边界层中的传热：层流、过渡流和湍流的相关性" [ASME J. Heat Mass Transfer-Trans.ASME, 2020, 142(6), p. 061805; DOI: 10.1115/1.4046795].

ASME Journal of Heat and Mass Transfer Pub Date : 2024-01-29 DOI: 10.1115/1.4064444

John H. Lienhard

引用次数: 0

Numerical Investigations of Stirring Induced Flow On Solidification and Interface Behaviour in Continuous Casting Mold with Bifurcated Nozzle 带分叉喷嘴的连铸模具中搅拌诱导流对凝固和界面行为的数值研究

ASME Journal of Heat and Mass Transfer Pub Date : 2024-01-27 DOI: 10.1115/1.4064561

Vipul Gupta, Pradeep Jha, P. Jain

{"title":"Numerical Investigations of Stirring Induced Flow On Solidification and Interface Behaviour in Continuous Casting Mold with Bifurcated Nozzle","authors":"Vipul Gupta, Pradeep Jha, P. Jain","doi":"10.1115/1.4064561","DOIUrl":"https://doi.org/10.1115/1.4064561","url":null,"abstract":"\u0000 Electromagnetic stirring(EMS) is a technique that has the potential to improve steel quality with fine microstructure by fragmentation of dendrites and enhancing the inclusion removal. The success of implementing the EMS lies in the selection of key input parameters such as position, frequency and current density of the stirrer. In the present study, an integrated mathematical model consisting of liquid steel solidification and two phase interface is numerically developed with the use of EMS. The enthalpy porosity and volume of fluid(VOF) model are adopted for numerical modelling analysis of solidification and interface level fluctuation respectively. The results reveal that on moving EMS downwards decreases the maximum magnetic field value, widens the mushy zone and promotes the stability of the interface. Current intensity and frequency are seen to have the opposite effect on stirring intensity and interface fluctuation. With an increase in frequency, both stirring intensity and interface level fluctuations decrease while the high liquid fraction region increases. Moreover, current density enhances the swirling flow intensity and homogenizes the liquid fraction, thereby promoting equiaxed grain formation. Interface fluctuation is seen to increase with current density.","PeriodicalId":505153,"journal":{"name":"ASME Journal of Heat and Mass Transfer","volume":"60 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140493054","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 Energy Storage Heat Exchanger Design: Overcoming Low Thermal Conductivity Limitations of Phase-Change Materials 热能存储热交换器设计：克服相变材料热传导率低的限制

ASME Journal of Heat and Mass Transfer Pub Date : 2024-01-25 DOI: 10.1115/1.4064563

Melissa Messenger, R. M. Manglik, S. Boetcher

{"title":"Thermal Energy Storage Heat Exchanger Design: Overcoming Low Thermal Conductivity Limitations of Phase-Change Materials","authors":"Melissa Messenger, R. M. Manglik, S. Boetcher","doi":"10.1115/1.4064563","DOIUrl":"https://doi.org/10.1115/1.4064563","url":null,"abstract":"\u0000 Recently, there has been a renewed interest in solid-to-liquid phase-change materials (PCMs) for thermal energy storage (TES) solutions in response to ambitious decarbonization goals. While PCMs have very high thermal storage capacities, their typically low thermal conductivities impose limitations on energy charging and discharging rates. Extensive research efforts have focused on improving PCM thermal conductivity through the incorporation of additives. However, this approach presents challenges such as achieving uniform mixtures, maintaining high latent heat, and cost. Alternatively, it has been demonstrated that, in this study, reducing the length scale of the PCM-encasement thickness can eliminate the low thermal conductivity effect of PCMs. To illustrate this concept, a one-dimensional PCM slab was numerically simulated. The thickness of the slab was varied to represent dimensions found in flow passages of compact heat exchangers, and the heat transfer coefficient of the heating fluid was varied to represent lower and upper bounds while also including nominal values encountered in air-to-air heat exchangers. The thermal conductivity was parametrically varied from the natural value of the PCM to simulated enhanced values (potentially achieved through additives) of up to 400 times larger. Results show that reducing the PCM encasement thickness yields substantially better performance than by improving the thermal conductivity, thereby demonstrating the potential for compact heat exchanger design to overcome the PCM thermal conductivity limitations.","PeriodicalId":505153,"journal":{"name":"ASME Journal of Heat and Mass Transfer","volume":"19 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139595935","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

Modeling of Average Nusselt Number by Machine Learning and Interpolation Techniques 利用机器学习和插值技术建立平均努塞尔特数模型

ASME Journal of Heat and Mass Transfer Pub Date : 2024-01-25 DOI: 10.1115/1.4064562

B. Pekmen Geridonmez

{"title":"Modeling of Average Nusselt Number by Machine Learning and Interpolation Techniques","authors":"B. Pekmen Geridonmez","doi":"10.1115/1.4064562","DOIUrl":"https://doi.org/10.1115/1.4064562","url":null,"abstract":"\u0000 In this study, an important heat transfer and fluid flow parameter, average Nusselt number Nu¯, is statistically modeled by using the data obtained from a numerical process. The two dimensional, time dependent dimensionless equations of natural convection flow either in the absence or in the presence of a uniform inclined magnetic field (MF) is numerically solved by using global radial basis function (RBF) method in spatial derivatives and the second order backward differentiation formula (BDF2) in time derivatives. Numerical simulations are performed in a set of combined dimensionless problem parameters. A data set with inputs Rayleigh number Ra, Prandtl number Pr and with output Nu¯ in the absence of MF, and a data set with inputs Ra, Pr, Hartmann number Ha, inclination angle gamma and with output Nu¯ in the presence of inclined uniform MF are saved. The obtained data is separated into train and test sets. Then, Nu¯ is firstly modeled by Neural Networks (NN). Secondly, interpolation is also examined. In terms of mean squared error metric, NN outputs give the best goodness of fit results comparing to curve fitting on test data. On the other side, it is shown that interpolation is also an alternative for modeling. This modeling issue enables one to get the desired result without making heavy numerical calculations many times.","PeriodicalId":505153,"journal":{"name":"ASME Journal of Heat and Mass Transfer","volume":"17 26","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139597306","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