Computational Thermal Sciences最新文献_第10页

SIMULTANEOUS CONTROL OF FRICTION DRAG REDUCTION AND HEAT TRANSFER AUGMENTATION BY TRAVELING WAVE-LIKE BLOWING/SUCTION 通过行波式吹风/吸力同时控制摩擦阻力减少和传热增加

IF 1.5

Computational Thermal Sciences Pub Date : 2011-12-01 DOI: 10.1615/COMPUTTHERMALSCIEN.2011003213

K. Higashi, H. Mamori, K. Fukagata

引用次数: 11

Effects of buoyancy on the performance of a vertical double-pipe heat exchanger 浮力对立式双管换热器性能的影响

IF 1.5

Computational Thermal Sciences Pub Date : 2011-01-21 DOI: 10.1615/COMPUTTHERMALSCIEN.2011003483

I. Voicu, N. Galanis, T. Maré

{"title":"Effects of buoyancy on the performance of a vertical double-pipe heat exchanger","authors":"I. Voicu, N. Galanis, T. Maré","doi":"10.1615/COMPUTTHERMALSCIEN.2011003483","DOIUrl":"https://doi.org/10.1615/COMPUTTHERMALSCIEN.2011003483","url":null,"abstract":"CFD simulations of heat transfer between two fluids in a parallel-flow vertical double-pipe heat exchanger, taking into consideration conduction in the walls, viscous dissipation, variable fluid properties, and axial diffusion in the fluids, illustrate the effects of buoyancy on the velocity and temperature profiles as well as on the Nusselt numbers and friction coefficients. In particular, the results show that flow reversal occurs at different positions depending on the flow direction. In the developing region, the fluid bulk temperatures, the wall temperature, and the local Nusselt numbers for both fluids depend on the flow direction. For the conditions under consideration, the Nusselt number for the fully developed flow in the inner pipe lies between the corresponding forced convection values for the constant heat flux and constant temperature conditions, while the one in the annulus is smaller than both these forced convection values. It is established that the flow and thermal fields in the inner cylinder and the annulus cannot be predicted correctly by studying each one separately since the thermal condition at the solid wall separating the two fluids depends on flow characteristics such as the Richardson number in the inner tube.","PeriodicalId":45052,"journal":{"name":"Computational Thermal Sciences","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2011-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67418835","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-RADIATION HEAT TRANSFER IN A VENTED PARTITIONED RECTANGULAR ENCLOSURE 矩形通风隔离罩内对流-辐射混合传热

IF 1.5

Computational Thermal Sciences Pub Date : 2011-01-01 DOI: 10.1615/COMPUTTHERMALSCIEN.2011002585

A. Bahlaoui, A. Raji, M. Hasnaoui, M. Naïmi

引用次数: 0

INFLUENCE OF BOILER SWING RATE ON DYNAMICS OF THERMAL AND FLOW CHARACTERISTICS IN WATER CIRCULATION BOILERS 锅炉摆频对水循环锅炉热流动力学特性的影响

IF 1.5

Computational Thermal Sciences Pub Date : 2011-01-01 DOI: 10.1615/COMPUTTHERMALSCIEN.2012004188

M. Habib, I. Al-Zaharnah, T. Ayinde, S. Al-Anizi, Y. Al-Awwad

引用次数: 3

NUMERICAL STUDY OF A TRANSITIONAL NATURAL VENTILATION FLOW DRIVEN BY A LINE SOURCE PLUME WITH VARIED REYNOLDS AND PRANDTL NUMBERS 变雷诺数和普朗特数线源羽流驱动的过渡自然通风流的数值研究

IF 1.5

Computational Thermal Sciences Pub Date : 2011-01-01 DOI: 10.1615/COMPUTTHERMALSCIEN.2011003212

T. Hattori, S. Armfield, M. Kirkpatrick, S. Maruyama, A. Komiya

引用次数: 2

COMBINED EFFECTS OF RADIATION AND NATURAL CONVECTION IN A SQUARE CAVITY SUBMITTED TO CROSS GRADIENTS OF TEMPERATURE: CASE OF PARTIAL HEATING AND COOLING 受温度梯度影响的方形腔内辐射和自然对流的联合效应:局部加热和局部冷却的情况

IF 1.5

Computational Thermal Sciences Pub Date : 2011-01-01 DOI: 10.1615/COMPUTTHERMALSCIEN.V3.I1.60

R. El Ayachi, A. Raji, M. Hasnaoui, A. Abdelbaki, Mohamed Naimi

引用次数: 3

EFFECT OF GAS RADIATION AND LAMINAR FORCED CONVECTION ON EVAPORATION 气体辐射和层流强迫对流对蒸发的影响

IF 1.5

Computational Thermal Sciences Pub Date : 2011-01-01 DOI: 10.1615/COMPUTTHERMALSCIEN.2011003070

F. B. Nejma, K. Slimi

引用次数: 2

HEAT AND MASS TRANSFER CONTROL BY EVAPORATIVE THERMAL PATTERNING OF THIN LIQUID LAYERS 通过薄液体层的蒸发热模式控制传热传质

IF 1.5

Computational Thermal Sciences Pub Date : 2011-01-01 DOI: 10.1615/COMPUTTHERMALSCIEN.2011003229

C. Iorio, O. Goncharova, O. Kabov

{"title":"HEAT AND MASS TRANSFER CONTROL BY EVAPORATIVE THERMAL PATTERNING OF THIN LIQUID LAYERS","authors":"C. Iorio, O. Goncharova, O. Kabov","doi":"10.1615/COMPUTTHERMALSCIEN.2011003229","DOIUrl":"https://doi.org/10.1615/COMPUTTHERMALSCIEN.2011003229","url":null,"abstract":"For several years, interfacial instabilities arising in evaporating layers of volatile liquid when subjected to a shear flow of inert and non-absorptive gas have been studied for their intrinsic complexity due to the interaction between different phenomena such as heat and mass transfer through the layer interface, thermo-capillarity, natural convection, and shear-induced stresses. More recently, the possibility of generating ordered thermal patterns in an evaporating layer by controlling such kinds of instabilities has been considered as an intriguing technique to enhance heat and mass transfer in precisely defined spots at the interface of the layers. We studied numerically the topology of the thermal patterns as well as the heat and mass transfer characteristics that can be induced in an evaporating liquid layer by controlling the thickness of the layer while keeping constant the gas flow intensity. Calculations have been conducted by considering ethanol as the working fluid and nitrogen as the inert gas. The thickness of the layer was varied in order to have aspect ratios with respect to the characteristic length of the evaporating interface in the range of 0.02-1. The inspiring reason for performing the simulations reported in this paper is the preparation of the CIMEX-1 experiment that will be performed on-board the International Space Station in the next future. For that reason, all the calculations presented refer to the condition of the absence of gravity. © 2011 by Begell House, Inc.","PeriodicalId":45052,"journal":{"name":"Computational Thermal Sciences","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1615/COMPUTTHERMALSCIEN.2011003229","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67418667","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: 39

Performance comparison of relations for nanofluids properties in the CFD prediction of mixed convection 混合对流CFD预测中纳米流体性质关系的性能比较

IF 1.5

Computational Thermal Sciences Pub Date : 2011-01-01 DOI: 10.1615/COMPUTTHERMALSCIEN.2011002831

M. Akbari, N. Galanis, A. Behzadmehr

引用次数: 0

LIQUID FILMS FALLING ON HORIZONTAL PLAIN CYLINDERS: PART 1-EXPERIMENTAL AND NUMERICAL STUDY OF FLOW BEHAVIOR 落在水平平面圆柱体上的液膜:第1部分-流动特性的实验和数值研究

IF 1.5

Computational Thermal Sciences Pub Date : 2011-01-01 DOI: 10.1615/COMPUTTHERMALSCIEN.V3.I2.60

F. Jafar, G. Thorpe, O. Turan

{"title":"LIQUID FILMS FALLING ON HORIZONTAL PLAIN CYLINDERS: PART 1-EXPERIMENTAL AND NUMERICAL STUDY OF FLOW BEHAVIOR","authors":"F. Jafar, G. Thorpe, O. Turan","doi":"10.1615/COMPUTTHERMALSCIEN.V3.I2.60","DOIUrl":"https://doi.org/10.1615/COMPUTTHERMALSCIEN.V3.I2.60","url":null,"abstract":"In this paper, an experimental and numerical investigation of liquid film falling over three horizontal plain cylinders is presented. The flow Reynolds number range studied is 50−2000, rendering the flow laminar. Numerical predictions are obtained using FLUENT, a proprietary computational fluid dynamic (CFD) code, for the 2D and 3D configurations of the three cylinders. In the numerical predictions, the mathematical approach is based on the volume of fluid (VOF) method to account for the fluid's two phases, namely, air and water. The primary objective of the present study was to carry out experiments to validate the numerical code. It was found that increasing the Reynolds number resulted in the flow mode changing from droplet, to jet, to sheet mode. The numerical analyses accurately predicted the Reynolds numbers at which these transitions occur. The flow mode is also related to the separation distance between the horizontal cylinders. The flow mode tends to be droplet at large separation, whereas it tends to be jet and sheet modes at small separations. The distances between adjacent columns of droplets and the adjacent jet decrease with increasing Reynolds number and cylinder diameter, a phenomenon also captured by the numerical analyses. No effects of hysteresis were observed on the spacing of the columns of droplets and jets as the Reynolds number was increased and decreased. The frequency at which droplets fell from all of the cylinders increased when the distance between the water feeder and the cylinder increased, and this effect exhibited hysteresis as the flow rate was successively increased and decreased.","PeriodicalId":45052,"journal":{"name":"Computational Thermal Sciences","volume":null,"pages":null},"PeriodicalIF":1.5,"publicationDate":"2011-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67420564","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