scholarly journals Fluid Flow and Heat Transfer of Combined Convection over Upward-Facing, Horizontal, Heated Plates Placed in Vertical Downward Flow(Thermal Engineering)

2009 ◽  
Vol 75 (759) ◽  
pp. 2249-2256 ◽  
Author(s):  
Kenzo KITAMURA ◽  
Akihiko MITSUISHI ◽  
Fumiyoshi KIMURA
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Thermal Engineering ◽  
Downward Flow ◽  
Flow And Heat Transfer ◽  
Combined Convection ◽  
Heated Plates

Influence of Flow Acceleration on Convection Heat Transfer of CO2 at Supercritical Pressures and Air in a Vertical Micro Tube

2010 ◽  
Author(s):  
Pei-Xue Jiang ◽  
Rui-Na Xu ◽  
Zhi-Hui Li ◽  
Chen-Ru Zhao
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Wall Temperature ◽  
Convection Heat Transfer ◽  
Heat Fluxes ◽  
Working Fluid ◽  
Convection Heat ◽  
Downward Flow ◽  
Flow Acceleration ◽  
Flow And Heat Transfer

The convection heat transfer of CO2 at supercritical pressures in a 0.0992 mm diameter vertical tube at relatively high Reynolds numbers (Rein = 6500), various heat fluxes and flow directions are investigated experimentally and numerically. The effects of buoyancy and flow acceleration resulting from the dramatic property variations are studied. The Results show that the local wall temperature varied non-linearly for both upward and downward flow when the heat flux was high. The difference in the local wall temperature between upward and downward flow is very small when the other test conditions are held the same, which indicates that for supercritical CO2 flowing in a micro tube as employed in this study, the buoyancy effect on the convection heat transfer is insignificant and the flow acceleration induced by the axial density variation with temperature is the main factor leading to the abnormal local wall temperature distribution at high heat fluxes. The predicted temperatures using the LB low Reynolds number turbulence model correspond well with the measured data. To further study the influence of flow acceleration on the convection heat transfer, air is also used as the working fluid to numerically investigate the fluid flow and heat transfer in the vertical micro tube. The results show that the effect of compressibility on the fluid flow and heat transfer of air in the vertical micro tube is significant but that the influence of thermal flow acceleration on convection heat transfer of air in a vertical micro tube is insignificant.

Fluid flow and heat transfer of opposing mixed convection adjacent to upward-facing, inclined heated plates

2007 ◽  
Vol 36 (3) ◽  
pp. 127-142 ◽  
Author(s):  
Toshiyuki Misumi ◽  
Syogo Shigemaru ◽  
Kenzo Kitamura ◽  
Kazunori Kamiya
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Mixed Convection ◽  
Flow And Heat Transfer ◽  
Heated Plates

Fluid flow and heat transfer of opposing mixed convection adjacent to downward-facing, inclined heated plates

2009 ◽  
Vol 38 (1) ◽  
pp. 25-39 ◽  
Author(s):  
Kenzo Kitamura ◽  
Jutaro Matsumoto ◽  
Akihiko Mitsuishi ◽  
Toshiyuki Misumi
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Mixed Convection ◽  
Flow And Heat Transfer ◽  
Heated Plates
Sign in / Sign up

Export Citation Format

Share Document