scholarly journals Comparison of Two-Phase Pressure Drop Models for Condensing Flows in Horizontal Tubes

2014 ◽  
Vol 10 (4) ◽  
pp. 19-27 ◽  
Author(s):  
Alina Filip ◽  
Florin Băltăreţu ◽  
Radu-Mircea Damian
Keyword(s):  
Pressure Drop ◽  
Two Phase ◽  
Operation Conditions ◽  
Horizontal Tubes ◽  
Hydraulic Design ◽  
Condensing Flows ◽  
Mass Flow Rates ◽  
Flow Pressure ◽  
Air Conditioning Systems ◽  
Phase Pressure

Abstract An important parameter in the hydraulic design of refrigeration and air-conditioning systems is the two-phase flow pressure drop. In this paper, the authors compare the numerical results obtained by using seven two-phase pressure-drop models with the experimental results found in the scientific literature, for the condensation of R600a and R717 (Ammonia = NH3) in horizontal tubes. Different mass flow rates and different conditions have been considered in order to see which correlation is applicable under specific operation conditions.

Two-phase pressure drop of air–water and R-410A in small horizontal tubes

2001 ◽  
Vol 27 (7) ◽  
pp. 1293-1299 ◽  
Author(s):  
Ing Youn Chen ◽  
Kai-Shing Yang ◽  
Yu-Juei Chang ◽  
Chi-Chung Wang
Keyword(s):  
Pressure Drop ◽  
Two Phase ◽  
Horizontal Tubes ◽  
Phase Pressure

Study of Liquid Injection on Pressure Drop of Refrigerant Mixtures Inside Enhanced Surface Tubing

2005 ◽  
Author(s):  
S. M. Sami ◽  
J. Comeau
Keyword(s):  
Pressure Drop ◽  
Positive Impact ◽  
Reynolds Numbers ◽  
Two Phase ◽  
Flow Rates ◽  
Refrigerant Mixtures ◽  
Liquid Injection ◽  
Mass Flow Rates ◽  
Flow Pressure ◽  
Enhanced Surface

Two phase flow pressure drop characteristics observed under liquid injection during boiling of refrigerant mixtures R-404A, R407C and R507 as well as R-410A are presented in this paper. Experiments showed that liquid injection tends to decrease the pressure drop during boiling which will have positive impact in increasing the boiling heat transfer rate, heat flux and system efficiency. However, condensation data demonstrated that liquid injection increases the pressure drop. In addition, the data also reveals that the refrigerant under investigation exhibit the same behaviour at higher Reynolds numbers or mass flow rates.

Two-Phase Flow Pressure Drop Model for a Shell Side of a Shell of Heat Exchanger

2013 ◽  
Vol 465-466 ◽  
pp. 613-616 ◽  
Author(s):  
Azmahani Sadikin ◽  
Nor Zelawati Asmuin
Keyword(s):  
Heat Exchanger ◽  
Pressure Drop ◽  
Momentum Flux ◽  
Liquid Fraction ◽  
Tube Bundle ◽  
Shell Side ◽  
Two Phase ◽  
Flow Pressure ◽  
Shell And Tube ◽  
Phase Pressure

This paper present a two-phase pressure drop model for a in-line tube bundle for airwater mixtures flowing through an idealised shell and tube, in-line heat exchanger. The model used momentum flux and entrained liquid fraction to predict the acceleration pressure drop. The model predicts the pressure drop well using both accelaration and gravitational pressure drop deduced from data available in open literature. The model is shown to be mass flux dependence.

Two-phase pressure drop of air-water in small horizontal tubes

2001 ◽  
Author(s):  
Ing Chen ◽  
Kai-Shing Yang ◽  
Chi-Chung Wang
Keyword(s):  
Pressure Drop ◽  
Two Phase ◽  
Horizontal Tubes ◽  
Phase Pressure

Effects of Two-Phase Pressure Drop on the Self-Sustained Oscillatory Instability in Condensing Flows

1989 ◽  
Vol 111 (2) ◽  
pp. 538-545 ◽  
Author(s):  
B. L. Bhatt ◽  
G. L. Wedekind ◽  
K. Jung
Keyword(s):  
Pressure Drop ◽  
Stability Boundary ◽  
The Self ◽  
Unstable Flow ◽  
Two Phase ◽  
Flow Phenomenon ◽  
Stabilizing Effect ◽  
Condensing Flows ◽  
Flow Reversals ◽  
Phase Pressure

This paper presents the results of an extension of an experimental and theoretical investigation of an unstable flow phenomenon that leads to self-sustained limit-cycle-type oscillations of large amplitude, and which, under certain conditions, can involve flow reversals. The influence of two-phase pressure drop is examined and shown to have a stabilizing effect on the instability. Inclusion of the two-phase pressure drop as part of the downstream throttling allows the utilization of a previously developed linearized analysis, based on the system mean void fraction model, to predict successfully the experimentally observed stability boundary.

Two-Phase Pressure Drop of Air-Water in Small Horizontal Tubes

2001 ◽  
Vol 15 (4) ◽  
pp. 409-415 ◽  
Author(s):  
Ing Youn Chen ◽  
Kai-Shing Yang ◽  
Chi-Chung Wang
Keyword(s):  
Pressure Drop ◽  
Two Phase ◽  
Horizontal Tubes ◽  
Phase Pressure
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