Hydrodynamics and Mass Transfer in a Porous‐Wall Channel

1984 ◽  
Vol 131 (8) ◽  
pp. 1828-1831 ◽  
Author(s):  
Philip Lessner ◽  
John Newman
Keyword(s):  
Mass Transfer ◽  
Porous Wall

The Combined Influence Of Heat And Mass Transfer Through A Porous Wall On The Boundary Layer Stability Compressible Gas At High Mach Numbers

2015 ◽  
Vol 10 (3) ◽  
pp. 31-40
Author(s):  
Sergey Gaponov ◽  
Natalya Terekhova
Keyword(s):  
Boundary Layer ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Porous Wall ◽  
Supersonic Boundary Layer ◽  
Management Regime ◽  
High Mach ◽  
Heavy Gas ◽  
Gas Blowing ◽  
Compressible Gas

This work continues the research on modeling the management regime in the boundary layer of compressible gas. The effect of the distribution of heat and mass transfer on the stability characteristics of supersonic boundary layer at high supersonic Mach number M = 5,35. The focus is on the modeling of acoustic disturbances in the conditions as a normal injection, in which the only nonzero component of the average velocity V, and the injection of other areas, including tangential, when the wall is not zero only U component. Production close to the problem of influence on the development of gas curtain small oscillations. It is assumed that the effect of injection of a homogeneous gas of different temperature similar to that of the blowing gas of different density, namely, blowing cold gas simulates heavy gas blowing and vice versa. Therefore in this modeling work is achieved by changing the factor of temperature (heating or cooling of the walls). The variant when the socalled regime implemented «lock» when the velocity perturbations on the porous surface can be taken as zero.

scholarly journals Study of heat and mass transfer control inside channel partially filled with a porous medium using nanofluids

2019 ◽  
pp. 460-460 ◽  
Author(s):  
Hamida Ben ◽  
Mohamed Massoudi ◽  
Riadh Marzouki ◽  
Lioua Kolsi ◽  
Mohammed Almeshaal ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Porous Medium ◽  
Heat And Mass Transfer ◽  
Volume Fraction ◽  
Solid Phase ◽  
Pure Water ◽  
Vertical Wall ◽  
Vertical Channel ◽  
Porous Wall ◽  
Nanoparticle Volume Fraction

The steady mixed convection of heat and mass transfer inside and outside a porous vertical wall is numerically studied. The porous wall, placed in a vertical channel, contains a solid phase, a nanofluid phase (Water-Al2O3 or Water-Cu) and gas phase. The effect of several physical quantities such as nanoparticle volume fraction, ambient temperature and initial nanofluid saturation on heat and mass transfer were investigated. Results reveal that the temperature of porous medium is decreased considerably with nanoparticle volume fraction. It has been also found that the heat and mass transfer are dramatically reduced using Water-Alumina nanofluid when compared with pure water.

Using an improved 1D boundary layer model with CFD for flux prediction in gas-sparged tubular membrane ultrafiltration

2005 ◽  
Vol 51 (6-7) ◽  
pp. 69-76 ◽  
Author(s):  
S.R. Smith ◽  
T. Taha ◽  
Z.F. Cui
Keyword(s):  
Boundary Layer ◽  
Mass Transfer ◽  
Shear Stress ◽  
Porous Wall ◽  
Transfer Model ◽  
Layer Model ◽  
Two Phase ◽  
Flow Process ◽  
Tubular Membrane ◽  
Boundary Layer Model

Tubular membrane ultrafiltration and microfiltration are important industrial separation and concentration processes. Process optimisation requires reduction of membrane build-up. Gas slug introduction has been shown to be a useful approach for flux enhancement. However, process quantification is required for design and optimisation. In this work we employ a non-porous wall CFD model to quantify hydrodynamics in the two-phase slug flow process. Mass transfer is subsequently quantified from wall shear stress, which was determined from the CFD. The mass transfer model is an improved one-dimensional boundary layer model, which empirically incorporates effects of wall suction and analytically includes edge effects for circular conduits. Predicted shear stress profiles are in agreement with experimental results and flux estimates prove more reliable than that from previous models. Previous models ignored suction effects and employed less rigorous fluid property inclusion, which ultimately led to under-predictive flux estimates. The presented model offers reliable process design and optimisation criteria for gas-sparged tubular membrane ultrafiltration.

scholarly journals Conjugate model for heat and mass transfer of porous wall in the high temperature gas flow

2001 ◽  
Vol 17 (3) ◽  
pp. 245-250 ◽  
Author(s):  
A. F. Polyakov ◽  
D. L. Reviznikov ◽  
Shen Qing ◽  
Tang Jinrong ◽  
Wei Shuru
Keyword(s):  
Mass Transfer ◽  
High Temperature ◽  
Heat And Mass Transfer ◽  
Gas Flow ◽  
Porous Wall ◽  
Conjugate Model ◽  
High Temperature Gas

A comment on “radial mass transfer effects in a porous wall tubular reactor”

1973 ◽  
Vol 16 (2) ◽  
pp. 525-526 ◽  
Author(s):  
Mahendra R. Doshi ◽  
R. Sankarasubramanian ◽  
William N. Gill
Keyword(s):  
Mass Transfer ◽  
Tubular Reactor ◽  
Porous Wall ◽  
Transfer Effects

Effect of Coupled Diffusion on Heat and Mass Transfer in Partially Porous Cavities

2009 ◽  
Author(s):  
Fang Liu ◽  
Baoming Chen ◽  
Wenguang Geng ◽  
Aimin Liu
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Porous Wall ◽  
Weak Form ◽  
Problem Formulation ◽  
Domain Model ◽  
Coupled Diffusion ◽  
Mass Transfer Processes ◽  
Element Approach ◽  
And Diffusion

VOCs natural convective flow from the porous layer to an air region, including thermo-diffusion and diffusion-thermo effects was studied in this paper. Two domain model was used for problem formulation. The partial differential equations, governing the problem under consideration, were solved by applying a finite element approach. Weak form equation was used to link interface between the porous wall and the air region. The effects of thermo-diffusion and diffusion-thermo had been examined on flow, temperature and concentration fields. The results showed that the above mentioned effects had to be taken into flow, heat and mass transfer processes.

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