Natural convection flow visualization in porous media

1987 ◽  
Vol 14 (6) ◽  
pp. 607-616 ◽  
Author(s):  
S. Chellaiah ◽  
R. Viskanta
Keyword(s):  
Porous Media ◽  
Natural Convection ◽  
Flow Visualization ◽  
Convection Flow ◽  
Natural Convection Flow

Natural-Convection Flow of Nanofluids Over Vertical Cone Embedded in Non-Darcy Porous Media

2013 ◽  
Vol 27 (2) ◽  
pp. 334-341 ◽  
Author(s):  
A. Noghrehabadi ◽  
A. Behseresht ◽  
M. Ghalambaz ◽  
J. Behseresht
Keyword(s):  
Porous Media ◽  
Natural Convection ◽  
Convection Flow ◽  
Vertical Cone ◽  
Natural Convection Flow

Flow Visualization Studies on Vortex Instability of Natural Convection Flow Over Horizontal and Slightly Inclined Constant-Temperature Plates

1988 ◽  
Vol 110 (3) ◽  
pp. 608-615 ◽  
Author(s):  
K. C. Cheng ◽  
Y. W. Kim
Keyword(s):  
Natural Convection ◽  
Flow Visualization ◽  
Ambient Air ◽  
Convection Flow ◽  
Turbulent Regime ◽  
Natural Convection Flow ◽  
Number Range ◽  
Grashof Number ◽  
Vortex Instability ◽  
Longitudinal Vortices

Flow visualization experiments were performed in a low-speed wind tunnel to study vortex instability of laminar natural convection flow along inclined isothermally heated plates having inclination angles from the horizontal of θ = 0, 5, 10, 15 and 20 deg. The temperature difference between plate surface and ambient air ranged from ΔT = 15.5 to 37.5°C and the local Grashof number range was Grx = 1.02×106 to 2.13×108. Three characteristic flow regimes were identified as follows: a two-dimensional laminar flow, a transition regime for developing longitudinal vortices, and a turbulent regime after the breakdown of the longitudinal vortices. Photographs are presented of side and top views of the flow and of cross-sectional views of the developing views of the developing secondary flow in the postcritical regime. Instability data of critical Grashof number and wavelength are presented and are compared with the theoretical predictions from the literature.

Heat and mass transfer by natural convection flow about a truncated cone in porous media with Soret and Dufour effects

2014 ◽  
Vol 24 (3) ◽  
pp. 595-612 ◽  
Author(s):  
A. Rashad ◽  
A. Chamkha
Keyword(s):  
Mass Transfer ◽  
Porous Media ◽  
Natural Convection ◽  
Thermal Radiation ◽  
Heat And Mass Transfer ◽  
Chemical Reaction ◽  
Convection Flow ◽  
Natural Convection Flow ◽  
Soret And Dufour Effects ◽  
Content Type

Purpose – The purpose of this paper is to study the effects of chemical reaction, thermal radiation and Soret and Dufour effects of heat and mass transfer by natural convection flow about a truncated cone in porous media. Design/methodology/approach – The problem is formulated and solved numerically by an accurate implicit finite-difference method. Findings – It is found that the Soret and Dufour effects as well as the thermal radiation and chemical reaction cause significant effects on the heat and mass transfer charateristics. Originality/value – The problem is relatively original as it considers Soret and Dufour as well as chemical reaction and porous media effects on this type of problem.

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