Mass Transfer in Parallel Plate Electrolyzers with Two‐Phase Liquid‐Liquid Flow

1984 ◽  
Vol 131 (5) ◽  
pp. 1059-1067 ◽  
Author(s):  
Po‐Yen Lu ◽  
Richard C. Alkire
Keyword(s):  
Mass Transfer ◽  
Liquid Flow ◽  
Parallel Plate ◽  
Two Phase ◽  
Phase Liquid

The effect of two-phase flow regime on hydrodynamics and mass transfer in a horizontal-tube gas-liquid reactor

1985 ◽  
Vol 50 (3) ◽  
pp. 745-757 ◽  
Author(s):  
Andreas Zahn ◽  
Lothar Ebner ◽  
Kurt Winkler ◽  
Jan Kratochvíl ◽  
Jindřich Zahradník
Keyword(s):  
Mass Transfer ◽  
Pressure Drop ◽  
Flow Regime ◽  
Liquid Flow ◽  
Horizontal Tube ◽  
Liquid Holdup ◽  
Two Phase ◽  
Flow Rates ◽  
Type Relation ◽  
Good Agreement

The effect of two-phase flow regime on decisive hydrodynamic and mass transfer characteristics of horizontal-tube gas-liquid reactors (pressure drop, liquid holdup, kLaL) was determined in a cocurrent-flow experimental unit of the length 4.15 m and diameter 0.05 m with air-water system. An adjustable-height weir was installed in the separation chamber at the reactor outlet to simulate the effect of internal baffles on reactor hydrodynamics. Flow regime maps were developed in the whole range of experimental gas and liquid flow rates both for the weirless arrangement and for the weir height 0.05 m, the former being in good agreement with flow-pattern boundaries presented by Mandhane. In the whole range of experi-mental conditions pressure drop data could be well correlated as a function of gas and liquid flow rates by an empirical exponential-type relation with specific sets of coefficients obtained for individual flow regimes from experimental data. Good agreement was observed between values of pressure drop obtained for weirless arrangement and data calculated from the Lockhart-Martinelli correlation while the contribution of weir to the overall pressure drop was well described by a relation proposed for the pressure loss in closed-end tubes. In the region of negligible weir influence values of liquid holdup were again succesfully correlated by the Lockhart-Martinelli relation while the dependence of liquid holdup data on gas and liquid flow rates obtained under conditions of significant weir effect (i.e. at low flow rates of both phases) could be well described by an empirical exponential-type relation. Results of preliminary kLaL measurements confirmed the decisive effect of the rate of energy dissipation on the intensity of interfacial mass transfer in gas-liquid dispersions.

Two‐Phase Mass Transfer in Channel Electrolyzers with Gas‐Liquid Flow

1985 ◽  
Vol 132 (3) ◽  
pp. 601-608 ◽  
Author(s):  
Demetre J. Economou ◽  
Richard C. Alkire
Keyword(s):  
Mass Transfer ◽  
Liquid Flow ◽  
Two Phase ◽  
Gas Liquid Flow

scholarly journals Numerical Model for Cavitational Flow in Hydraulic Poppet Valves

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Sandor I. Bernad ◽  
Romeo Susan-Resiga
Keyword(s):  
Liquid Flow ◽  
Bubble Dynamics ◽  
Flow Analysis ◽  
Cavitating Flow ◽  
Absolute Pressure ◽  
Two Phase ◽  
Current Effort ◽  
Flow Models ◽  
Density Distributions ◽  
Phase Liquid

The paper presents a numerical simulation and analysis of the flow inside a poppet valve. First, the single-phase (liquid) flow is investigated, and an original model is introduced for quantitatively describing the vortex flow. Since an atmospheric outlet pressure produces large negative absolute pressure regions, a two-phase (cavitating) flow analysis is also performed. Both pressure and density distributions inside the cavity are presented, and a comparison with the liquid flow results is performed. It is found that if one defines the cavity radius such that up to this radius the pressure is no larger than the vaporization pressure, then both liquid and cavitating flow models predict the cavity extent. The current effort is based on the application of the recently developed full cavitation model that utilizes the modified Rayleigh-Plesset equations for bubble dynamics.

Numerical modeling of two-phase liquid flow in fractal porous medium

2004 ◽  
Vol 40 (5) ◽  
pp. 474-481
Author(s):  
E. P. Kurochkina ◽  
O. N. Soboleva ◽  
M. I. Epov
Keyword(s):  
Porous Medium ◽  
Numerical Modeling ◽  
Liquid Flow ◽  
Two Phase ◽  
Phase Liquid

Mass transfer controlled corrosion of pipelines under two phase (gas—liquid) flow

1994 ◽  
Vol 29 (2) ◽  
pp. 147-151 ◽  
Author(s):  
G. H. Sedahmed ◽  
I. S. Mansour ◽  
G. Abd El-Latif
Keyword(s):  
Mass Transfer ◽  
Liquid Flow ◽  
Two Phase ◽  
Gas Liquid Flow
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