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Letters in Heat and Mass Transfer最新文献

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Call for papers Mini-symposium on advances in grid generation 关于电网发电进展的小型研讨会征文
Letters in Heat and Mass Transfer Pub Date : 1982-09-01 DOI: 10.1016/0094-4548(82)90012-1
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引用次数: 0
Heat transfer between a vertical tube and an air fluidized bed at moderate temperatures (335–528 K) 在中等温度(335-528 K)下垂直管和空气流化床之间的传热
Letters in Heat and Mass Transfer Pub Date : 1982-09-01 DOI: 10.1016/0094-4548(82)90009-1
Neena Sathi , De Chang Liu , Li-Dan Yang , S.C. Saxena
{"title":"Heat transfer between a vertical tube and an air fluidized bed at moderate temperatures (335–528 K)","authors":"Neena Sathi ,&nbsp;De Chang Liu ,&nbsp;Li-Dan Yang ,&nbsp;S.C. Saxena","doi":"10.1016/0094-4548(82)90009-1","DOIUrl":"10.1016/0094-4548(82)90009-1","url":null,"abstract":"<div><p>Heat transfer coefficient is measured between a 25.4 mm outer diameter smooth vertical tube immersed in 0.254 m internal diameter fluidized beds of sand (d<sub>p</sub> = 265, 507 and 787 <em>μ</em>m), glass beds (239, 357 and 412 μm), silicon (368 μm) and alumina (267 μm) as a function of bed temperature (335 – 528 K) and fluidizing velocity. The solids movement and mixing in the bed is investigated by measuring the heat transfer coefficient at two radial positions in the bed for various values of fluidization velocity and bed temperature. The minimum fluidization velocity, bed voidage and maximum heat transfer coefficient are also reported for different experimental conditions. The qualitative variation of h<sub>o</sub> with different operating and system parameters is found consistent with the known mechanisms of heat transfer for an immersed surface in a fluidized bed. Quantitative correlation of h<sub>o</sub> and h<sub>omax</sub> will be reported in a future publication.</p></div>","PeriodicalId":100875,"journal":{"name":"Letters in Heat and Mass Transfer","volume":"9 5","pages":"Pages 395-406"},"PeriodicalIF":0.0,"publicationDate":"1982-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0094-4548(82)90009-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76607211","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: 3
Effects of concentration and seeding on the solidification fouling of paraffin wax from hydrocarbons 浓度和播种对石蜡固化结垢的影响
Letters in Heat and Mass Transfer Pub Date : 1982-09-01 DOI: 10.1016/0094-4548(82)90006-6
A. Sharma, J.P. Gupta ∗
{"title":"Effects of concentration and seeding on the solidification fouling of paraffin wax from hydrocarbons","authors":"A. Sharma,&nbsp;J.P. Gupta ∗","doi":"10.1016/0094-4548(82)90006-6","DOIUrl":"10.1016/0094-4548(82)90006-6","url":null,"abstract":"","PeriodicalId":100875,"journal":{"name":"Letters in Heat and Mass Transfer","volume":"9 5","pages":"Pages 371-375"},"PeriodicalIF":0.0,"publicationDate":"1982-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0094-4548(82)90006-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83484653","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
Ecoulement diphasique permanent a bas nombre de Reynolds et bas nombre capillaire dans une succession de divergents-convergents methode de resolution aux differences finies 在发散收敛序列中具有低雷诺数和低毛细管数的永久两相流有限差分求解方法
Letters in Heat and Mass Transfer Pub Date : 1982-09-01 DOI: 10.1016/0094-4548(82)90003-0
Michel Danis
{"title":"Ecoulement diphasique permanent a bas nombre de Reynolds et bas nombre capillaire dans une succession de divergents-convergents methode de resolution aux differences finies","authors":"Michel Danis","doi":"10.1016/0094-4548(82)90003-0","DOIUrl":"10.1016/0094-4548(82)90003-0","url":null,"abstract":"<div><p>Solution for two-phase flow with low Reynolds number and low Capillary number in two-dimensional divergent-convergent channel is presented. The method consists in (1) solving separately in each fluid domain the Navier-Stokes and continuity equations for some velocity conditions on the interface and (2) choosing the solution which appears physically as the most satisfactory relatively to the equality of tangential stresses on both sides of the interface. So, for a given interface, it is possible to determine the pressure drop in such a channel for various viscosity ratios.</p></div>","PeriodicalId":100875,"journal":{"name":"Letters in Heat and Mass Transfer","volume":"9 5","pages":"Pages 343-350"},"PeriodicalIF":0.0,"publicationDate":"1982-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0094-4548(82)90003-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79949971","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
Parametric analysis of direct contact sensible heat transfer in spray columns 喷雾塔内直接接触显热的参数分析
Letters in Heat and Mass Transfer Pub Date : 1982-07-01 DOI: 10.1016/0094-4548(82)90035-2
P. Battya, Vijay R. Raghavan, K.N. Seetharamu
{"title":"Parametric analysis of direct contact sensible heat transfer in spray columns","authors":"P. Battya,&nbsp;Vijay R. Raghavan,&nbsp;K.N. Seetharamu","doi":"10.1016/0094-4548(82)90035-2","DOIUrl":"10.1016/0094-4548(82)90035-2","url":null,"abstract":"<div><p>The present investigation deals with a theoretical analysis of direct contact sensible heat transfer between two immiscible liquids in a countercurrent spray column. The non-dimensional parameters governing the heat transfer process are identified and a study of the effects of the variation of these parameters is made. The predicted column heights and the temperature profiles of both the phases along the column compare favourably with the available experimental data.</p></div>","PeriodicalId":100875,"journal":{"name":"Letters in Heat and Mass Transfer","volume":"9 4","pages":"Pages 265-276"},"PeriodicalIF":0.0,"publicationDate":"1982-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0094-4548(82)90035-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84004102","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: 9
An experimental investigation of dryout heat flux on a horizontal nonisothermal tube during heat transfer 水平非等温管传热过程中干热流密度的实验研究
Letters in Heat and Mass Transfer Pub Date : 1982-07-01 DOI: 10.1016/0094-4548(82)90034-0
R.S. Rana, V. Charan
{"title":"An experimental investigation of dryout heat flux on a horizontal nonisothermal tube during heat transfer","authors":"R.S. Rana,&nbsp;V. Charan","doi":"10.1016/0094-4548(82)90034-0","DOIUrl":"10.1016/0094-4548(82)90034-0","url":null,"abstract":"<div><p>This paper presents an experimental investigation of film breakdown heat flux for water film flowing over a heat dissipator tube inside which hot fluid flows. Data for clean tubes and with continuously falling water for long period are reported. Influence of flow rate on dryout heat flux for both type of tubes and on heat transfer prior to dryout for tube with longer usuage is presented. The effect of temperature difference between hot fluid and falling water film on the film breakdown heat flux and heat transfer coefficients prior to film breakdown is also reported.</p></div>","PeriodicalId":100875,"journal":{"name":"Letters in Heat and Mass Transfer","volume":"9 4","pages":"Pages 255-264"},"PeriodicalIF":0.0,"publicationDate":"1982-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0094-4548(82)90034-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73342877","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
Mixed convection — a comparison between experiment and an exact numerical solution of the boundary layer equations 混合对流——边界层方程的实验与精确数值解的比较
Letters in Heat and Mass Transfer Pub Date : 1982-07-01 DOI: 10.1016/0094-4548(82)90037-6
Roland Hunt, Graham Wilks
{"title":"Mixed convection — a comparison between experiment and an exact numerical solution of the boundary layer equations","authors":"Roland Hunt,&nbsp;Graham Wilks","doi":"10.1016/0094-4548(82)90037-6","DOIUrl":"10.1016/0094-4548(82)90037-6","url":null,"abstract":"","PeriodicalId":100875,"journal":{"name":"Letters in Heat and Mass Transfer","volume":"9 4","pages":"Pages 291-298"},"PeriodicalIF":0.0,"publicationDate":"1982-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0094-4548(82)90037-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79940112","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: 2
A mushy zone model with an exact solution 带精确解的糊状区模型
Letters in Heat and Mass Transfer Pub Date : 1982-07-01 DOI: 10.1016/0094-4548(82)90040-6
A.D. Solomon, D.G. Wilson, V. Alexiades
{"title":"A mushy zone model with an exact solution","authors":"A.D. Solomon,&nbsp;D.G. Wilson,&nbsp;V. Alexiades","doi":"10.1016/0094-4548(82)90040-6","DOIUrl":"10.1016/0094-4548(82)90040-6","url":null,"abstract":"<div><p>We propose a very simple model of a mushy zone which admits of an explicit solution. To our knowledge, it is the only instance where an actual observation of the mushy zone width and structure is used as a partial basis for the model definition. The model rests upon two unknown parameters. The first determines the relation between the equilibrium temperature gradient and the mushy zone width. The second depends upon the dendritic structure in the mushy zone, and is related to the solid fraction. Both can be estimated from experiments. We define the model, present its closed form solution, and give tables from which the solution can be found explicitly. It is seen that in most cases the predicted mushy zone is of very small width.</p></div>","PeriodicalId":100875,"journal":{"name":"Letters in Heat and Mass Transfer","volume":"9 4","pages":"Pages 319-324"},"PeriodicalIF":0.0,"publicationDate":"1982-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0094-4548(82)90040-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91547576","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: 21
A steady-state melt layer model with absorption, conduction, and surface vaporization 具有吸收、传导和表面蒸发的稳态熔体层模型
Letters in Heat and Mass Transfer Pub Date : 1982-07-01 DOI: 10.1016/0094-4548(82)90038-8
R.L. Baker
{"title":"A steady-state melt layer model with absorption, conduction, and surface vaporization","authors":"R.L. Baker","doi":"10.1016/0094-4548(82)90038-8","DOIUrl":"10.1016/0094-4548(82)90038-8","url":null,"abstract":"<div><p>An analytic solution is presented for the steady-state moving boundary melt layer problem with volumetric energy absorption. Energy balances across the melt layer and the liquid-solid interface show the relative contributions of absorption, conduction, and phase change energy transfer and allow the melt layer thickness to be determined. Due to the vaporization (ablation) of material from the melt layer surface, the temperature profiles exhibit a maximum value within the melt layer. The temperature profiles and melt layer thickness are shown to be functions of the spectral absorptivity, the thermal diffusivity, and the surface recession rate. These variables occur together in a dimensionless group.</p></div>","PeriodicalId":100875,"journal":{"name":"Letters in Heat and Mass Transfer","volume":"9 4","pages":"Pages 299-308"},"PeriodicalIF":0.0,"publicationDate":"1982-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0094-4548(82)90038-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89904904","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: 2
Effects of polymer additives on pool boiling phenomena 聚合物添加剂对池沸现象的影响
Letters in Heat and Mass Transfer Pub Date : 1982-07-01 DOI: 10.1016/0094-4548(82)90032-7
Yu Min Yang, Jer Ru Maa
{"title":"Effects of polymer additives on pool boiling phenomena","authors":"Yu Min Yang,&nbsp;Jer Ru Maa","doi":"10.1016/0094-4548(82)90032-7","DOIUrl":"10.1016/0094-4548(82)90032-7","url":null,"abstract":"<div><p>The addition of small amount of soluble polymer makes the boiling behavior significantly different from that of pure water. The polymer additives reduce the tendency of coalescence between vapor bubbles. Consequently, they become smaller in size, larger in number, and tend to stay on the heating surface in a relatively orderly manner. No significant improvement in heat transfer rate caused by the polymer additives was observed in this work; the critical burn out heat flux was reduced slightly.</p></div>","PeriodicalId":100875,"journal":{"name":"Letters in Heat and Mass Transfer","volume":"9 4","pages":"Pages 237-244"},"PeriodicalIF":0.0,"publicationDate":"1982-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0094-4548(82)90032-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76474647","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: 15
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