NUMERICAL SIMULATIONS ON FLOW AND HEAT TRANSFER OF DOUBLE DROPLETS SUCCESSIVELY IMPINGING ON HEATED SURFACE

2018 ◽  
Author(s):  
Feng Wang ◽  
Yali Guo ◽  
Qinggang Qiu ◽  
Shengqiang Shen
Keyword(s):  
Heat Transfer ◽  
Numerical Simulations ◽  
Heated Surface ◽  
Flow And Heat Transfer

A Numerical Study of Heat Transfer and Flow Structure in Channels With Miniature V Rib-Dimple Hybrid Structure on One Wall

2018 ◽  
Author(s):  
Peng Zhang ◽  
Yu Rao ◽  
Yanlin Li
Keyword(s):  
Heat Transfer ◽  
Turbulent Flow ◽  
Numerical Simulations ◽  
Numerical Study ◽  
Reynolds Numbers ◽  
Hybrid Structure ◽  
Transfer Enhancement ◽  
Nusselt Numbers ◽  
Flow And Heat Transfer ◽  
Flow Mixing

This paper presents a numerical study on turbulent flow and heat transfer in the channels with a novel hybrid cooling structure with miniature V-shaped ribs and dimples on one wall. The heat transfer characteristics, pressure loss and turbulent flow structures in the channels with the rib-dimples with three different rib heights of 0.6 mm, 1.0 mm and 1.5 mm are obtained for the Reynolds numbers ranging from 18,700 to 60,000 by numerical simulations, which are also compared with counterpart of a pure dimpled and pure V ribbed channel. The results show that the overall Nusselt numbers of the V rib-dimple channel with the rib height of 1.5 mm is up to 70% higher than that of the channels with pure dimples. The numerical simulations show that the arrangement of the miniature V rib upstream each dimple induces complex secondary flow near the wall and generates downwashing vortices, which intensifies the flow mixing and turbulent kinetic energy in the dimple, resulting in significant improvement in heat transfer enhancement and uniformness.

Numerical Simulations of Fluid Flow and Heat Transfer in Pulse Tubes

2005 ◽  
pp. 303-312
Author(s):  
A. E. Schroth ◽  
M. Sahimi ◽  
C. S. Kirkconnell
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Numerical Simulations ◽  
Flow And Heat Transfer
Sign in / Sign up

Export Citation Format

Share Document