A numerical study of laminar free convection heat transfer between inner sphere and outer vertical cylinder

2007 ◽  
Vol 50 (13-14) ◽  
pp. 2656-2666 ◽  
Author(s):  
Wen Ruey Chen
Keyword(s):  
Heat Transfer ◽  
Free Convection ◽  
Numerical Study ◽  
Convection Heat Transfer ◽  
Vertical Cylinder ◽  
Convection Heat ◽  
Inner Sphere ◽  
Free Convection Heat

scholarly journals Numerical study on laminar free convection heat transfer between sphere particle and high pressure water in pseudo-critical zone

2014 ◽  
Vol 18 (4) ◽  
pp. 1293-1303 ◽  
Author(s):  
Liping Wei ◽  
Youjun Lu ◽  
Jinjia Wei
Keyword(s):  
Heat Transfer ◽  
High Pressure ◽  
Free Convection ◽  
Fluidized Bed ◽  
Numerical Study ◽  
Convection Heat Transfer ◽  
Boussinesq Approximation ◽  
Convection Heat ◽  
Pressure Water ◽  
Free Convection Heat

Supercritical water fluidized bed reactor (SCWFBR) is a promising new reaction vessel which can effectively gasify wet biomass and efficiently produce hydrogen. Free convection heat transfer from particle in supercritical water (SCW) is a major basic heat transfer mechanism in a fixed bed or fluidized bed with low superficial velocity. In this paper, numerical study on the steady free convection heat transfer around single sphere particle in high pressure water of pseudo-critical zone was carried out. Both the Boussinesq approximation method and real properties model (considering variable specific heat, density, viscosity, and conductivity of SCW) were incorporated to simulate the flow and temperature field. With respect to Boussinesq approximation, real properties model shows higher vorticity and temperature gradients in the vicinity of the sphere surface, which shows variation of thermo-physical property has remarkable effect on the free convection heat transfer process. High local Nusselt number and high heat transfer rate were observed with real properties model.

Sign in / Sign up

Export Citation Format

Share Document