Study on the Intervascular Two-Phase Flow Characters of Horizontal-Tube Falling Film Evaporator

2012 ◽  
Vol 516-517 ◽  
pp. 208-211 ◽  
Author(s):  
Ji You Fei ◽  
Qi Chao Guo ◽  
Hua Li ◽  
Ran Deng
Keyword(s):  
Two Phase Flow ◽  
Standard Condition ◽  
Horizontal Tube ◽  
Flow Mode ◽  
Phase Flow ◽  
Falling Film ◽  
Two Phase ◽  
Film Evaporator ◽  
Staggered Arrangement ◽  
The Mathematical Model

In this paper, the mathematical model of a horizontal-tube falling film evaporator that used in air condition and refrigeration system was founded. The evaporative tubes of the evaporator were cold and staggered arrangement. The numerical simulation of the intervascular flow of the oil-bearing refrigerant R134a was carried out, under the conditions of varies flow mode and varies structures of distributed equipment. Under the standard condition of air conditioning, the study of the intervascular two-phase flow characters of the horizontal-tube falling film evaporator were analyzed in the last. The research achievements can provide theoretical laws for relief the effects of the intervascular vapor shear stress on the quality of the liquid film formed outside the evaporative tubes. And the conclusions have practical and guide means for the horizontal-tube falling film evaporator design and evaporative tubes arrangement optimization.

scholarly journals Investigation of two-phase flow hydrodynamics of heat exchange tube outlet falling film evaporator

2021 ◽  
Author(s):  
V. N. Gushshamova ◽  
A. P. Khomyakov ◽  
S. V. Mordanov ◽  
T. V. Khomyakova
Keyword(s):  
Heat Exchange ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Falling Film ◽  
Two Phase ◽  
Film Evaporator ◽  
Heat Exchange Tube

scholarly journals DYNAMICS OF TWO-PHASE FLOW ACROSS HORIZONTAL TUBE BUNDLES - A REVIEW

2005 ◽  
Vol 4 (2) ◽  
Author(s):  
G. Ribatskia ◽  
J. R. Thome
Keyword(s):  
Void Fraction ◽  
Two Phase Flow ◽  
Experimental Studies ◽  
Horizontal Tube ◽  
Prediction Methods ◽  
Phase Flow ◽  
Two Phase ◽  
Pressure Drops ◽  
Frictional Pressure Drop ◽  
Tube Bundles

This paper presents a state-of-the-art review of the hydrodynamic aspects of two-phase flow across horizontal tube bundles. The review covers studies related to the evaluation of void fraction, two-phase flow behaviors and pressure drops on the shell side of staggered and in-line tube bundles for upward, downward and side-to-side flows. This study of the literature critically describes the proposed flow pattern maps and semi-empirical correlations for predicting void fraction and frictional pressure drop. These predicting methods are generally based on experimental results for adiabatic air-water flows. A limited number of experimental studies with R-11 and R-113 were also carried out in the past. The review shows noticeable discrepancies among the available prediction methods. Finally, this study suggests that further research focusing on the development of representative databanks and new prediction methods is still necessary.

INVESTIGATION ON VOID FRACTION FOR TWO-PHASE FLOW PRESSURE DROP OF EVAPORATIVE R-290 IN HORIZONTAL TUBE

2016 ◽  
Vol 78 (8-4) ◽  
Author(s):  
Agus Sunjarianto Pamitran ◽  
Sentot Novianto ◽  
Normah Mohd-Ghazali ◽  
Nasruddin Nasruddin ◽  
Raldi Koestoer
Keyword(s):  
Pressure Drop ◽  
Void Fraction ◽  
Two Phase Flow ◽  
Flow Boiling ◽  
Homogeneous Model ◽  
Saturation Temperature ◽  
Horizontal Tube ◽  
Phase Flow ◽  
Two Phase ◽  
Experimental Conditions

Two-phase flow boiling pressure drop experiment was conducted to observe its characteristics and to develop a new correlation of void fraction based on the separated model. Investigation is completed on the natural refrigerant R-290 (propane) in a horizontal circular tube with a 7.6 mm inner diameter under experimental conditions of 3.7 to 9.6 °C saturation temperature, 10 to 25 kW/m2 heat flux, and 185 to 445 kg/m2s mass flux. The present experimental data was used to obtain the calculated void fraction which then was compared to the predicted void fraction with 31 existing correlations. A new void fraction correlation for predicting two-phase flow boiling pressure drop, as a function of Reynolds numbers, was proposed. The measured pressure drop was compared to the predicted pressure drop with some existing pressure drop models that use the newly developed void fraction model. The homogeneous model of void fraction showed the best prediction with 2% deviation

CFD simulation of the two-phase flow for a falling film microreactor

2011 ◽  
Vol 54 (15-16) ◽  
pp. 3740-3748 ◽  
Author(s):  
Chii-Dong Ho ◽  
Hsuan Chang ◽  
Hsi-Jen Chen ◽  
Cheng-Liang Chang ◽  
Hsieh-Hsung Li ◽  
...  
Keyword(s):  
Cfd Simulation ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Falling Film ◽  
Two Phase
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