Experimental and numerical study of heat and moisture transfers by natural convection in a cavity filled with solid obstacles

2009 ◽  
Vol 52 (25-26) ◽  
pp. 5691-5700 ◽  
Author(s):  
O. Laguerre ◽  
S. Benamara ◽  
D. Remy ◽  
D. Flick
Keyword(s):  
Natural Convection ◽  
Numerical Study ◽  
Solid Obstacles ◽  
Heat And Moisture

Periodic Natural Convection Inside a Fluid Saturated Porous Medium Made of Disconnected Solid Obstacles: A Continuum Approach

2016 ◽  
Author(s):  
S. M. Mirehei ◽  
J. L. Lage
Keyword(s):  
Porous Medium ◽  
Natural Convection ◽  
Numerical Study ◽  
Saturated Porous Medium ◽  
Continuum Modeling ◽  
Periodic Heating ◽  
Interference Phenomenon ◽  
Modeling Approach ◽  
Fluid Saturated Porous Medium ◽  
Solid Obstacles

Results of a numerical study considering the periodic natural convection inside a fluid saturated porous medium are presented. The porous medium is obtained by placing four, large and uniformly distributed solid obstacles of regular (square) shape inside the enclosure, a structure that hinders the option of seeking a porous-continuum modeling approach. The periodic heating is achieved by imposing a time-periodic and spatially uniform high temperature condition at one of the walls of the enclosure, while the other wall is maintained at a constant, uniform and low temperature; the horizontal surfaces are set as adiabatic. Heat transfer results are obtained then by following a continuum modeling approach, and reported on a parametric form with the Prandtl number fixed equal to 7, and the Rayleigh number inside the enclosure varying from 103 to 107. The boundary layer interference phenomenon, observed for the case of constant horizontal heating, is also observed in the case of periodic heating. The visualization of the natural convection process via isotherms and streamlines, together with the periodic (time-varying) Nusselt number, allows the identification of a singular dynamic behavior, including the storage of thermal energy inside the enclosure.

EXPERIMENTAL AND NUMERICAL STUDY OF THREE-DIMENSIONAL NATURAL CONVECTION AND FREEZING IN WATER

1994 ◽  
Author(s):  
C. Abegg ◽  
Graham de Vahl Davis ◽  
W.J. Hiller ◽  
St. Koch ◽  
Tomasz A. Kowalewski ◽  
...  
Keyword(s):  
Natural Convection ◽  
Numerical Study ◽  
Three Dimensional

EXPERIMENTAL AND NUMERICAL STUDY OF NATURAL CONVECTION AROUND A SQUARE DISK

Equipment ◽  
2006 ◽  
Author(s):  
A. Willockx ◽  
C. T'Joen ◽  
H. Steeman ◽  
M. De Paepe
Keyword(s):  
Natural Convection ◽  
Numerical Study

NUMERICAL STUDY OF NATURAL CONVECTION IN A SPHERICAL POROUS ANNULUS

2016 ◽  
Vol 19 (3) ◽  
pp. 277-286 ◽  
Author(s):  
Sangita ◽  
Mrityunjay K. Sinha ◽  
R. V. Sharma
Keyword(s):  
Natural Convection ◽  
Numerical Study

An Investigation of the Effect of interrupted fin arrangements on the Thermal Performance of a Heat Sink under a Free Convection Condition

2019 ◽  
Vol 7 (1) ◽  
pp. 43-53
Author(s):  
Abbas Jassem Jubear ◽  
Ali Hameed Abd
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Natural Convection ◽  
Thermal Performance ◽  
Heat Sink ◽  
Numerical Study ◽  
Ansys Fluent ◽  
Fluent Software ◽  
Steady State Heat ◽  
Steady State Heat Transfer

The heat sink with vertically rectangular interrupted fins was investigated numerically in a natural convection field, with steady-state heat transfer. A numerical study has been conducted using ANSYS Fluent software (R16.1) in order to develop a 3-D numerical model.  The dimensions of the fins are (305 mm length, 100 mm width, 17 mm height, and 9.5 mm space between fins. The number of fins used on the surface is eight. In this study, the heat input was used as follows: 20, 40, 60, 80, 100, and 120 watts. This study focused on interrupted rectangular fins with a different arrangement and angle of the fins. Results show that the addition of interruption in fins in various arrangements will improve the thermal performance of the heat sink, and through the results, a better interruption rate as an equation can be obtained.

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