Investigation of heat transfer in a geometry with variable cross section

2009 ◽  
pp. n/a-n/a
Author(s):  
M. Alipanah ◽  
D.D. Ganji ◽  
E. Farnad ◽  
K. Babaei
Keyword(s):  
Heat Transfer ◽  
Cross Section ◽  
Variable Cross Section ◽  
Variable Cross

Numerical Study on the Heat Transfer Characteristic in Periodical Variable Cross-Section Channel

2011 ◽  
Vol 243-249 ◽  
pp. 4935-4938
Author(s):  
Li Li ◽  
Xiao Ze Du
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Cross Section ◽  
Heat Transfer Characteristic ◽  
Numerical Study ◽  
Transfer Characteristic ◽  
Variable Cross Section ◽  
Central Line ◽  
Large Reynolds Number ◽  
Variable Cross

The heat transfer characteristic through periodical variable cross-section passage is studied with numerical scheme. The results in multi-period variable cross-section channel show that the heat transfer enhancement can be obtained by forming flow destabilization at large Reynolds number. The parameters include pressure, velocity, temperature in the channel are symmetric about central line at low Reynolds number, then change to asymmetric at high Reynolds number. The variations occur firstly at the downstream near outlet of the channel and move upstream, which could improve the fluid mixing to increase the enhancement of heat transfer in channel.

Heat Transfer Characteristic Inside Two-Pass Variable Cross-Section Channels With Ribs and Bleed Holes

2004 ◽  
Author(s):  
Xiangyun Liu ◽  
Shuiting Ding ◽  
Zhi Tao ◽  
Guoqiang Xu
Keyword(s):  
Heat Transfer ◽  
Cross Section ◽  
Transfer Characteristic ◽  
Reynolds Numbers ◽  
Variable Cross Section ◽  
Heat Transfer Process ◽  
Variable Cross ◽  
Relative Roughness ◽  
Cross Section Area ◽  
Section Area

Heat transfer characteristics were experimentally studied for two-pass channels with variable cross-section with and without ribs. Rectangular ribs were placed symmetrically on two opposite walls with attack angles of 90° and 60° to the main flow. The bleed holes were only distributed on the rib roughened surface along the second pass. The cross-section area of the channel varied in the way that it increased along the first pass and decreased along the second. The relative roughness heights were 0.092 and 0.123; the relative roughness pitches were 10 and 20. The experiments were carried out at Reynolds numbers from 7100 to 60000. Analysis of the experimental results may lead to the following conclusions: (1) The heat transfer was enhanced by the presence of variable cross section. (2) The 60° ribs was not necessarily the optimistic option as published in the literature, test showed that 90° ribs produced a hither heat transfer for the relative roughness height of 0.092. (3) For up to 30% of bleeding were outlet, the existence of bleed holes enhanced the heat transfer process.

Application of the Three-Parameter Differential Model of Turbulence for Solving Problems of Flow and Heat Transfer in Channels of Variable Cross-Section. Part 2

2021 ◽  
Vol 12 (2) ◽  
pp. 89-106
Author(s):  
V. G. Lushchik ◽  
◽  
M. S. Makarova ◽  
A. I. Reshmin ◽  
◽  
...  
Keyword(s):  
Heat Transfer ◽  
Cross Section ◽  
Numerical Study ◽  
Narrow Channel ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Differential Model ◽  
Heat Transfer Intensification ◽  
Flow And Heat Transfer ◽  
Shear Turbulence

A description of the method of numerical study in the approximation of a narrow channel of the problems of flow and heat transfer in flat and circular channels of variable cross-section using a differential three-parameter model of shear turbulence is presented. The main results of numerous studies using the proposed method are described, one of the goals of which was to substantiate the possibility of using the narrow channel approximation. This review study is carried out in two parts. In the second part the results of the study of laminarization during flow in the con-fuser and the pipe, heat transfer intensification during flow in diffusers and in a plate heat exchanger with diffuser channels are presented.

Constructal heat transfer and fluid flow enhancement optimization for cylindrical microcooling channels with variable cross‐section

Heat Transfer ◽  
2021 ◽  
Author(s):  
Olabode T. Olakoyejo ◽  
Adekunle O. Adelaja ◽  
Olayinka O. Adewumi ◽  
Adeyinka A. Oluwo ◽  
Solomon K. Bello ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Cross Section ◽  
Variable Cross Section ◽  
Variable Cross ◽  
Flow Enhancement
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