Macroscopic correlation for natural convection in water saturated metal foam relative to the placement within an enclosure heated from below

2015 ◽  
Vol 85 ◽  
pp. 890-896 ◽  
Author(s):  
Yan Su ◽  
Aaron Wade ◽  
Jane H. Davidson
Keyword(s):  
Natural Convection ◽  
Metal Foam ◽  
Water Saturated

Natural convection in water-saturated metal foam

2008 ◽  
Vol 51 (15-16) ◽  
pp. 3794-3802 ◽  
Author(s):  
V. Kathare ◽  
J.H. Davidson ◽  
F.A. Kulacki
Keyword(s):  
Natural Convection ◽  
Metal Foam ◽  
Water Saturated

scholarly journals Latent Heat Thermal Storage of Nano-Enhanced Phase Change Material Filled by Copper Foam with Linear Porosity Variation in Vertical Direction

Energies ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1508
Author(s):  
Mohammad Ghalambaz ◽  
Mohammad Shahabadi ◽  
S. A. M Mehryan ◽  
Mikhail Sheremet ◽  
Obai Younis ◽  
...  
Keyword(s):  
Natural Convection ◽  
Phase Change ◽  
Phase Change Material ◽  
Metal Foam ◽  
Vertical Direction ◽  
Melting Time ◽  
Copper Foam ◽  
Average Porosity ◽  
The Impact ◽  
Change Material

The melting flow and heat transfer of copper-oxide coconut oil in thermal energy storage filled with a nonlinear copper metal foam are addressed. The porosity of the copper foam changes linearly from bottom to top. The phase change material (PCM) is filled into the metal foam pores, which form a composite PCM. The natural convection effect is also taken into account. The effect of average porosity; porosity distribution; pore size density; the inclination angle of enclosure; and nanoparticles’ concentration on the isotherms, melting maps, and the melting rate are investigated. The results show that the average porosity is the most important parameter on the melting behavior. The variation in porosity from 0.825 to 0.9 changes the melting time by about 116%. The natural convection flows are weak in the metal foam, and hence, the impact of each of the other parameters on the melting time is insignificant (less than 5%).

Natural Convection in Water-Saturated Rock Mass under Artificial Freezing

2020 ◽  
Vol 56 (2) ◽  
pp. 297-308
Author(s):  
M. A. Semin ◽  
L. Yu. Levin ◽  
M. S. Zhelnin ◽  
O. A. Plekhov
Keyword(s):  
Rock Mass ◽  
Natural Convection ◽  
Saturated Rock ◽  
Artificial Freezing ◽  
Water Saturated

Freezing of Water-Saturated Porous Media in the Presence of Natural Convection: Experiments and Analysis

1989 ◽  
Vol 111 (2) ◽  
pp. 425-432 ◽  
Author(s):  
S. Chellaiah ◽  
R. Viskanta
Keyword(s):  
Porous Media ◽  
Natural Convection ◽  
Convection Flow ◽  
Liquid Region ◽  
Measured Temperature ◽  
Density Inversion ◽  
Flow And Heat Transfer ◽  
Numerical Predictions ◽  
Darcy Equations ◽  
Water Saturated

Freezing of superheated water-porous media (glass beads) contained in a rectangular test cell has been studied both experimentally and numerically. The effects of liquid superheat and imposed temperature difference were investigated. When the superheat across the liquid region was small the flow in the porous media was weak, and the interface was almost planar. For larger superheats, natural convection flow and the solidification front shape and velocity were found to depend on the imposed temperature and the permeability of the porous medium. Due to the density inversion of water, the rate of freezing was higher, either at the top or at the bottom of the cell, depending on the amount of superheat. The measured temperature distributions were compared with predictions of numerical model that considered both conduction in the solid and natural convection in the liquid region. This model is based on volumetric averaging of the macroscopic transport equations, with phase change assumed to occur volumetrically over a small temperature range. Both Brinkman and Forchheimer extensions were added to the Darcy equations. The effect of density inversion of water on the fluid flow and heat transfer has been modeled. Good agreement has been found between the experimental data and numerical predictions.

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