Heat transfer enhancement of micro-scale backward-facing step channel by using turbulators

2018 ◽  
Vol 126 ◽  
pp. 963-973 ◽  
Author(s):  
Hamdi E. Ahmed ◽  
A.Sh. Kherbeet ◽  
M.I. Ahmed ◽  
B.H. Salman
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Transfer Enhancement ◽  
Backward Facing Step ◽  
Micro Scale

Heat Transfer Enhancement of a Backward-Facing Step Flow in a Duct by Static and Dynamic Devices

2007 ◽  
Author(s):  
Kyoji Inaoka ◽  
Kouji Kawakami ◽  
Yoshi Nishii ◽  
Mamoru Senda
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Enhancement ◽  
Large Scale ◽  
Fluid Motion ◽  
Side Wall ◽  
Transfer Enhancement ◽  
Backward Facing Step ◽  
Electromagnetic Actuators ◽  
Flow Recirculation ◽  
Flow Modification

Flow modification downstream of a backward-facing step has been tried in order to achieve heat transfer enhancement by introducing two kinds of devices, a triangle prism rib and electromagnetic actuators, on the step edge. The triangle rib attached to the side-wall corner makes the downward flow inclined and generates a circulation-like fluid motion behind it. Because both flows work effective in reducing the flow re-circulation caused behind the step, large heat transfer recovery is obtained near the side-wall. This advantage of the triangle rib remains effective when the flap actuations are imposed. Thus, the large-scale unsteady vortex intensively reduces the flow recirculation, the triangle rib with flap actuations attains the largest heat transfer recovery behind the step.

Consideration of Heat Transfer Enhancement Mechanism of Nano- and Micro-Scale Porous Layer via Flow Visualization

2011 ◽  
Vol 32 (11-12) ◽  
pp. 968-973 ◽  
Author(s):  
Haomin Sun ◽  
Zensaku Kawara ◽  
Yoshitaka Ueki ◽  
Tetsuo Naritomi ◽  
Tomoaki Kunugi
Keyword(s):  
Heat Transfer ◽  
Flow Visualization ◽  
Heat Transfer Enhancement ◽  
Porous Layer ◽  
Transfer Enhancement ◽  
Micro Scale ◽  
Enhancement Mechanism
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