The pressure drop in a porous material layer during combustion

1995 ◽  
Vol 31 (1) ◽  
pp. 54-57
Author(s):  
B. N. Kondrikov
Keyword(s):  
Pressure Drop ◽  
Porous Material ◽  
Material Layer

Thermal performance evaluation of a microchannel with different porous media insert configurations

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Rouhollah Moosavi ◽  
Mehdi Banihashemi ◽  
Cheng-Xian Lin
Keyword(s):  
Heat Transfer ◽  
Porous Media ◽  
Performance Evaluation ◽  
Pressure Drop ◽  
Porous Material ◽  
Thermal Performance ◽  
Longitudinal Direction ◽  
Performance Ratio ◽  
Content Type ◽  
Porous Blocks

Purpose This paper aims to numerically investigate the thermal performance evaluation of a microchannel with different porous media insert configurations. Design/methodology/approach Heat transfer and pressure drop of fluid flow through a three-dimensional (3D) microchannel with different partially and filled porous media insert configurations are investigated numerically. The number of divisions and positions of porous material inside the microchannel for 12 different arrangements are considered. A control volume method is used for single-phase laminar flow with the Darcy–Forchheimer model used for the porous media. The geometry of the problem consists of a microchannel with a rectangular cross-section of 0.4 mm × 0.2 mm and length 20 mm, with a stainless steel porous material insert with a porosity coefficient of ε = 0.32 and a Darcy number of Da = 2.7 × 10−4. Findings Numerical results show that when the transverse arrangement is used, as the number of partitions increases, the thermal performance is improved and the heat transfer increases up to 300% compared to that of the plain microchannel. Comparing the obtained results from the microchannels with transverse and longitudinal configurations, at low Reynolds numbers, the transverse arrangement of porous blocks and at high Reynold numbers, the longitudinal arrangement present the best thermal performance which is virtually four times higher compared to the obtained Nu numbers from the plain microchannel. The results show that as the volume of porous material is constant in the cases with various transverse porous blocks, the pressure drop is not changed in these cases. Also, the highest thermal performance ratio is when the porous material is placed along the walls in a longitudinal direction. Originality/value To the best knowledge of the authors, in the previous research, the effect of the arrangement and location of the porous medium in the transverse and longitudinal direction in the microchannel and their effect in different states on the behavior of flow and heat transfer has not been numerically investigated. In this study, the porous media configuration and its placement in a 3D microchannel were numerically studied. The effect of porous material layout and configurations in different longitudinal and transverse directions on the pressure drop, heat transfer and thermal performance in the 3D microchannel is investigated numerically.

Water movement through a swelling material

Soil Research ◽  
1965 ◽  
Vol 3 (1) ◽  
pp. 11 ◽  
Author(s):  
AV Blackmore ◽  
TJ Marshall
Keyword(s):  
Hydrostatic Pressure ◽  
Hydraulic Conductivity ◽  
Pressure Drop ◽  
Porous Material ◽  
Double Layer ◽  
Void Ratio ◽  
Electrolyte Concentration ◽  
Water Movement ◽  
Field Conditions ◽  
Sodium Montmorillonite

The effect of the drag of a fluid on the porous material through which it flows is examined for a swelling material. It is shown that, when equilibrium is established between drag and swelling in films of oriented sodium montmorillonite, there is a decrease in void ratio in the material in the direction of flow. This effect of drag increases with decreasing electrolyte concentration of the permeating solution, in accord with double-layer theory, and with increasing drop in hydrostatic pressure across the film. Hydraulic conductivity was found to increase with decreasing electrolyte concentration of the permeating solution, contrary to usual experience. The cause of this is considered to be the increase in spacing corresponding to decrease in concentration. Hydraulic conductivity of unconfined film at equilibrium was found to decrease with increasing drop in hydrostatic pressure across the film. An increase in the pressure drop causes a decrease in the spacing of the clay, particularly towards the base of the film, so that the hydraulic conductivity of the whole film is lowered. Consequently Darcy's law does not hold for these films. Implications for less ordered swelling systems are considered briefly. The effect of drag on soils under field conditions will ordinarily be negligible.

Numerical study of porous material layer effects on mitigating sloshing in a membrane LNG tank

2020 ◽  
Vol 218 ◽  
pp. 108240
Author(s):  
Mi-An Xue ◽  
Zhouyu Jiang ◽  
Ya-An Hu ◽  
Xiaoli Yuan
Keyword(s):  
Porous Material ◽  
Numerical Study ◽  
Material Layer ◽  
Lng Tank

Multi-layered shielding against hypervelocity space debris: conceptual study of implementation of a high-porous material layer

2003 ◽  
Vol 29 (1-10) ◽  
pp. 357-367 ◽  
Author(s):  
Andrey G. Ioilev ◽  
Vadim V. Bashurov ◽  
Gennady V. Belov ◽  
Gennady V. Bebrnin ◽  
Yury N. Bukharev ◽  
...  
Keyword(s):  
Porous Material ◽  
Space Debris ◽  
Material Layer ◽  
Conceptual Study
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