Stratified flow model for two-phase pressure drop prediction in trickle beds

AIChE Journal ◽  
1988 ◽  
Vol 34 (3) ◽  
pp. 510-513 ◽  
Author(s):  
J. Biswas ◽  
G. V. Bhaskar ◽  
P. F. Greenfield
Keyword(s):  
Pressure Drop ◽  
Flow Model ◽  
Stratified Flow ◽  
Two Phase ◽  
Trickle Beds ◽  
Phase Pressure

The Numerical Calculation of Two-Phase Pressure Drop During Flow Boiling in the Vertical Annular Channel

2008 ◽  
Author(s):  
Ruosu Wang ◽  
Changhong Peng ◽  
Tao Zhou ◽  
Shichao Wang
Keyword(s):  
Heat Flux ◽  
Numerical Calculation ◽  
Pressure Drop ◽  
Mass Flux ◽  
Flow Model ◽  
Flow Boiling ◽  
Annular Channel ◽  
Phase Flow ◽  
Two Phase ◽  
Phase Pressure

In this paper, according to a separated phase flow model for annular two-phase flow in the vertical annular channel, the liquid film thickness, void fraction and two-phase pressure drop along the flow channel are predicted. The calculated pressure drop values are compared with that measured in experiment in the range of mass flux from 38.8 to 163.1kg/m2s; pressure from 1.5 to 6.0 MPa; and heat flux from 4.9 to 50.7kW/m2 for inside tube and from 4.2 to 78.8kW/m2 for outside tube. It can be found that the model can predict the pressure drop well. With the mass flux increasing and the gap of the annular channel decreasing, pressure drop increases.

scholarly journals Experimental Investigation and Prediction on Pressure Drop during Flow Boiling in Horizontal Microchannels

Micromachines ◽  
2021 ◽  
Vol 12 (5) ◽  
pp. 510
Author(s):  
Yan Huang ◽  
Bifen Shu ◽  
Shengnan Zhou ◽  
Qi Shi
Keyword(s):  
Pressure Drop ◽  
Flow Model ◽  
Two Phase Flow ◽  
Flow Boiling ◽  
Separated Flow ◽  
Heat Fluxes ◽  
Phase Flow ◽  
Vapor Quality ◽  
Two Phase ◽  
Gas Flux

In this paper, two-phase pressure drop data were obtained for boiling in horizontal rectangular microchannels with a hydraulic diameter of 0.55 mm for R-134a over mass velocities from 790 to 1122, heat fluxes from 0 to 31.08 kW/m2 and vapor qualities from 0 to 0.25. The experimental results show that the Chisholm parameter in the separated flow model relies heavily on the vapor quality, especially in the low vapor quality region (from 0 to 0.1), where the two-phase flow pattern is mainly bubbly and slug flow. Then, the measured pressure drop data are compared with those from six separated flow models. Based on the comparison result, the superficial gas flux is introduced in this paper to consider the comprehensive influence of mass velocity and vapor quality on two-phase flow pressure drop, and a new equation for the Chisholm parameter in the separated flow model is proposed as a function of the superficial gas flux . The mean absolute error (MAE ) of the new flow correlation is 16.82%, which is significantly lower than the other correlations. Moreover, the applicability of the new expression has been verified by the experimental data in other literatures.

Two-Phase Flows in Mini-/Micro-Gas Flow Channels of PEM Fuel Cells

2013 ◽  
Author(s):  
Sung Chan Cho ◽  
Yun Wang
Keyword(s):  
Pressure Drop ◽  
Gas Flow ◽  
Fluid Model ◽  
Pem Fuel Cells ◽  
Two Phase ◽  
Micro Gas Flow ◽  
Two Fluid Model ◽  
The Impact ◽  
Two Fluid ◽  
Phase Pressure

In this paper, two-phase flow dynamics in a micro channel with various wall conditions are both experimentally and theoretically investigated. Annulus, wavy and slug flow patterns are observed and location of liquid phase on different wall condition is visualized. The impact of flow structure on two-phase pressure drop is explained. Two-phase pressure drop is compared to a two-fluid model with relative permeability correlation. Optimization of correlation is conducted for each experimental case and theoretical solution for the flows in a circular channel is developed for annulus flow pattern showing a good match with experimental data in homogeneous channel case.

scholarly journals Two-Phase Pressure Drop Across Abrupt Area Changes in Oscillatory Flow

1976 ◽  
Vol 61 (3) ◽  
pp. 297-309 ◽  
Author(s):  
J. Weisman ◽  
T. Ake ◽  
R. Knott
Keyword(s):  
Pressure Drop ◽  
Oscillatory Flow ◽  
Two Phase ◽  
Phase Pressure
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