Heat and Mass Transfer最新文献

Thermal deformation analysis of motorized spindle base on thermo-solid structure coupling theory 基于热固耦合结构理论的电动主轴基座热变形分析

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-09-05 DOI: 10.1007/s00231-024-03519-3

Yan Li, Kejun Wu, Nan Wang, Zhuo Wang, Wenqiang Li, Mohan Lei

{"title":"Thermal deformation analysis of motorized spindle base on thermo-solid structure coupling theory","authors":"Yan Li, Kejun Wu, Nan Wang, Zhuo Wang, Wenqiang Li, Mohan Lei","doi":"10.1007/s00231-024-03519-3","DOIUrl":"https://doi.org/10.1007/s00231-024-03519-3","url":null,"abstract":"Machining different types of complex parts requires changing speed of the motorized spindle to accommodate the various processes, resulting in temperature rise or decline and then causing thermal deformation of machine tool, which plays a significant impact on the machining accuracy of the parts. According to the Law of Conservation of Energy and Fourier's Law of Heat Conduction, the heat transfer mechanism of the motorized spindle is investigated. Based on the thermo-solid structure coupling theory, the analytic models of the temperature field and thermal deformation for the motorized spindle are established, and the thermal hysteresis phenomenon is explored by means of the case studies. The characteristic experiments were carried out under variable working conditions and the model parameters were identified using Genetic Algorithm (GA). The accuracy and effectiveness of the proposed models for predicting temperature and thermal deformation of the spindle are validated which is applicable to compensate the thermal errors. Moreover, compared with data-driven modeling approach, our study needs lesser data for parameter identification, greatly saving the computation time in modeling.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215889","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

Bee bread: sorption isotherms, thermodynamic characteristics of moisture adsorption and evaluation of adsorbed water 蜜蜂面包：吸附等温线、水分吸附的热力学特性和吸附水的评估

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-09-03 DOI: 10.1007/s00231-024-03518-4

Ceren Mutlu

引用次数: 0

A numerical study of liquid water distribution and transport in PEM fuel cell using Cathode-Anode model 利用阴极-阳极模型对 PEM 燃料电池中的液态水分布和传输进行数值研究

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-09-02 DOI: 10.1007/s00231-024-03515-7

Navdeep Malik, N. Allwyn Blessing Johnson, Sarit K. Das

{"title":"A numerical study of liquid water distribution and transport in PEM fuel cell using Cathode-Anode model","authors":"Navdeep Malik, N. Allwyn Blessing Johnson, Sarit K. Das","doi":"10.1007/s00231-024-03515-7","DOIUrl":"https://doi.org/10.1007/s00231-024-03515-7","url":null,"abstract":"The performance of a PEM fuel cell that uses hydrogen as the fuel and pure oxygen as the oxidant strongly depends on water management, which has been primarily studied in a single-channel domain. Therefore, there is a need to examine water distribution throughout the entire fuel cell domain, including both the anode and cathode sides. Liquid water can cause flooding in the gas diffusion layer, catalyst layer, and channels, reducing the active surface area of the catalyst and, consequently, the reaction rate. Phase transfer between liquid water and water vapor influences the buildup of liquid water in these domains. In the present work, a three-dimensional, non-isothermal, two-phase numerical model incorporating both the cathode and anode domains has been developed to study water distribution. This model includes water phase transition in the gas diffusion layer, catalyst layer, and channels. The mixed flow distributor is used to analyze water formation and distribution throughout the domain. The study shows that using pure oxygen at the inlet increases the ohmic region in the polarization curve and decreases concentration losses, which could be important for applications such as spacecraft. Additionally, the effects of liquid water accumulation in the porous layers on reactant transport and cell performance are investigated.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215891","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 analysis of transient and steady-state heat transfer from an impinging jet to a moving plate 撞击喷流到移动板的瞬态和稳态传热实验分析

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-09-02 DOI: 10.1007/s00231-024-03517-5

Celal Kistak, Ali Taskiran, Nevin Celik

{"title":"Experimental analysis of transient and steady-state heat transfer from an impinging jet to a moving plate","authors":"Celal Kistak, Ali Taskiran, Nevin Celik","doi":"10.1007/s00231-024-03517-5","DOIUrl":"https://doi.org/10.1007/s00231-024-03517-5","url":null,"abstract":"In this study, the transient and steady-state heat transfer caused by an air jet impinging on a heated plate moving back and forth in the horizontal direction is investigated experimentally. The jet flow issuing form nozzle of various geometry (circular, triangle, square) is impinged on rough and smooth surfaces. In addition, Reynolds number (jet velocity), distance between the nozzle and the plate, plate velocity and stroke are considered as independent parameters that could affect the heat transfer.The optimum number of experiments is determined with the help of Taguchi design of experiment method. The transient and steady-state heat transfer are analyzed by means a high-technology thermal camera. Local and average Nusselt numbers representing the heat transfer characteristics are calculated in response to the variable parameters. Comparative graphs and ANOVA test results are presented and evaluated in order to determine the effects of parameters on heat transfer. As a result, it has been seen that Reynolds number (82%) is the most dominant parameter affecting heat transfer. Other parameters are listed as nozzle geometry (7.6%), surface roughness (4.9%), plate velocity (1%), stroke (0.6%) and nozzle-plate distance (0.1%) according to their degree of effect.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215890","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

Assessment of carrier agents in terms of physicochemical, energy analyses and bioactive constituents of blackberry (Rubus fruticosus L.) powder processed by convective and hybrid drying methods 从物理化学、能量分析和生物活性成分的角度对采用对流和混合干燥法加工的黑莓（Rubus fruticosus L.）粉末的载体剂进行评估

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-08-24 DOI: 10.1007/s00231-024-03516-6

Samet Kaya Dursun, Muhammed Taşova, Emircan Dinçer, Mehmet Emin İşbilir

{"title":"Assessment of carrier agents in terms of physicochemical, energy analyses and bioactive constituents of blackberry (Rubus fruticosus L.) powder processed by convective and hybrid drying methods","authors":"Samet Kaya Dursun, Muhammed Taşova, Emircan Dinçer, Mehmet Emin İşbilir","doi":"10.1007/s00231-024-03516-6","DOIUrl":"https://doi.org/10.1007/s00231-024-03516-6","url":null,"abstract":"In this study, the effect of maltodextrin, powdered sugar, and corn starch carrier agents used at different ratios (5% and 10%) in the convective dryer at 65 ºC and hybrid dryer (microwave + convective) at 350 W + 65 ºC to produce blackberry powder was investigated. Drying kinetics, energy analyses, physical, flow properties, and biochemical analyses of blackberry powder production processes were investigated. Drying rates in drying processes varied between 0.0052–0.0477 g moisture/g dry matter minute. Effective moisture diffusion values were determined between 3.36 × 10–8-2.57 × 10–7 m2/s. Specific moisture absorption rate and specific energy consumption values were found to vary between 0.0019–0.0034 kg/kWh and 237.15–530.00 kWh/kg, respectively. Tapped density was determined in the range of 1.666–2.765 g/ml, while bulk density was determined in the range of 1.319–1.937 g/ml. The wettability values of blackberry powders were found to vary between 2.00–27.67 s. Drying processes did not preserve the color values of fresh blackberry puree (p < 0.05). In bioactive findings, total phenol content values were 16.756–25.876 µg GAE/g−1 dw, total monomeric anthocyanin values were 229–1.469 µg cy−3-glu/g−1 dw, total flavonoid values 3.958–5.080 mg KE/kg dw and total antioxidant activity values 406–500 µmol TE/g−1 dw.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215812","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

Cattaneo-Christov and Darcy-Forchheimer heat flux on Reiner-Philippoff fluid with Velocity and Thermal Slip Boundary Condition under heat Sink/Source 热沉/热源条件下具有速度和热滑移边界条件的 Reiner-Philippoff 流体上的 Cattaneo-Christov 和 Darcy-Forchheimer 热通量

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-08-23 DOI: 10.1007/s00231-024-03512-w

Sanaullah Warraich, Nadia Ayub, Fatima Qadeer, Irfan Umar

{"title":"Cattaneo-Christov and Darcy-Forchheimer heat flux on Reiner-Philippoff fluid with Velocity and Thermal Slip Boundary Condition under heat Sink/Source","authors":"Sanaullah Warraich, Nadia Ayub, Fatima Qadeer, Irfan Umar","doi":"10.1007/s00231-024-03512-w","DOIUrl":"https://doi.org/10.1007/s00231-024-03512-w","url":null,"abstract":"Reiner–Philippoff (RP) fluid flow above a heated sheet concluded the model of Cattaneo–Christov heat flux for Darcy-Forchheimer is implemented in this work. The influences of thermal radiation, heat source/sink, velocity, and thermal slip boundary conditions are also deliberated. The transformations are used to convert obtained partial differential equations into a set of ordinary differential equations, and they are solved numerically using the shooting method (RK-4) solver with the help of the computational software MATLAB. The dimensionless temperature and velocity numbers are further developed. More engineering curiosity of local Nusselt and Skin frictions are tabulated, depicted, and interpreted. The study presents graphical and tabular illustrations depicting flow parameters, velocity profiles, and temperature profiles. Key conclusions drawn include, When the inertia coefficient ({F}_{r}) increases, the velocity field (f^{prime}(eta )) decreases. Analytical calculations are performed for the flow of a Reiner-Philippoff fluid over a shrinking sheet, considering influences such as thermal radiation, velocity slip, and temperature fluctuations. Increased heat absorption correlates with higher Nusselt numbers, whereas temperature generation lowers wall temperatures. The skin friction magnitude gradually increases in the order of dilatant, viscous, and pseudo-plastic fluids, respectively.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215811","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

Enhanced CeO2 evaporation from refractory crucibles (Mo, Ta, W) 增强耐火坩埚（钼、钽、钨）中 CeO2 的蒸发能力

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-08-13 DOI: 10.1007/s00231-024-03513-9

N. N. Antonov, A. V. Gavrikov, S. D. Kuzmichev, A. D. Melnikov, V. P. Smirnov, R. A. Usmanov, L. S. Volkov

引用次数: 0

Theoretical analysis of hot oil carrying in hydrostatic bearing 静压轴承中的热油携带理论分析

IF 2.2 4区工程技术

Heat and Mass Transfer Pub Date : 2024-08-13 DOI: 10.1007/s00231-024-03514-8

Zhang Yanqin, Jin Shi, Jiang Jinming, Long Dunyao

{"title":"Theoretical analysis of hot oil carrying in hydrostatic bearing","authors":"Zhang Yanqin, Jin Shi, Jiang Jinming, Long Dunyao","doi":"10.1007/s00231-024-03514-8","DOIUrl":"https://doi.org/10.1007/s00231-024-03514-8","url":null,"abstract":"Through the analysis of hot oil carrying theory, the problem of oil film heat accumulation in hydrostatic bearing can be revealed, so as to avoid serious lubrication failure caused by heat accumulation. In this paper, the hot oil carrying factor is defined and the mathematical model of the thermal oil carrying characteristics of the oil film is established by taking the beveled double rectangular oil pad hydrostatic bearing as the object, and the hot oil carrying law under different working conditions is obtained by changing the inclination angle of the beveled oil pad at 0.0230°, 0.0250° and 0.0280°, respectively. Theoretical calculations and simulation studies show that within the range of the circumferential inclination of the oil pad with better dynamic pressure effect of the bearing, the inclination has little effect on the oil film hot oil carrying. When the speed of the workbench is lower than 10r/min, no oil film hot oil carrying phenomenon occurs. When the speed is in the range of 10r/min-100r/min, a part of the load will cause the phenomenon of oil film hot oil carrying. And when the speed exceeds 100r/min, the heat accumulation of the oil film is the most serious at this time. There are many reasons for the lubrication failure of hydrostatic bearings, and hot oil carrying is a new research direction, this paper starts from the oil film heating mechanism of beveled oil pads hydrostatic bearings, and describes the phenomenon of hot oil carrying.","PeriodicalId":12908,"journal":{"name":"Heat and Mass Transfer","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142215813","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

Post-dryout heat transfer in circular tubes using R-134a: experiment and correlation assessment 使用 R-134a 的圆管中的干燥后传热：实验和相关性评估

IF 1.7 4区工程技术

Heat and Mass Transfer Pub Date : 2024-08-10 DOI: 10.1007/s00231-024-03498-5

L. Köckert, Wei Liu, Xu Cheng

引用次数: 0

Aerodynamic performance and cooling effect of exhaust passage in steam turbine with new water spray scheme 采用新喷水方案的汽轮机排气通道的空气动力性能和冷却效果

IF 1.7 4区工程技术

Heat and Mass Transfer Pub Date : 2024-08-09 DOI: 10.1007/s00231-024-03510-y

Lihua Cao, Wanyu Li, Han Du

引用次数: 0