F221 Two-Phase Pressure Drop through Return Bend in Micro- and Mini-channels

2015 ◽  
Vol 2015.20 (0) ◽  
pp. 373-376
Author(s):  
Akimaro KAWAHARA ◽  
Michio SADATOMI ◽  
Shinichi MIYAGAWA
Keyword(s):  
Pressure Drop ◽  
Two Phase ◽  
Mini Channels ◽  
Phase Pressure

Experimental Study on Two-Phase Pressure Drop of Air-Water in Horizontal Mini Channel

2014 ◽  
Author(s):  
Ravi S. Engineer ◽  
Hemant B. Mehta
Keyword(s):  
Pressure Drop ◽  
Single Phase ◽  
Water Mixture ◽  
Two Phase ◽  
New Correlation ◽  
Flow Test ◽  
Mini Channels ◽  
Glass Tubes ◽  
Straight Flow ◽  
Phase Pressure

The new correlation for two-phase pressure drop for mini channel is developed by performing experiment on adiabatic two-phase pressure drop in mini channel with 3.1 mm diameter. Air-water mixture is used as the working substance. 180°-90°-90° (straight flow) test sections made of transparent glass tubes of 3.1 mm diameter with lengths of 900 mm. The superficial velocity varies from 0.2238 m/s to 1.1876 m/s for liquid (UL) and air (UG). Two phase flow pressure drop experiment is divided into two parts. First single phase pressure drop for air and water is experimented. The diameter is verified by measuring pressure drop of the air. Single phase pressure drop for air and water is experimented first which is followed by two phase pressure drop in the same mini channel. The existing correlations for macro and mini-channels are compared with the experimental data. Using Matlab & Minitab; a new correlation has been developed to predict two-phase pressure drop in horizontal mini channels.

scholarly journals Experimental study on two-phase pressure drop of air-water in small diameter tubes at horizontal orientation

2014 ◽  
Vol 18 (2) ◽  
pp. 521-532 ◽  
Author(s):  
Arun Autee ◽  
Srinivasa Rao ◽  
Ravikumar Puli ◽  
Ramakant Shrivastava
Keyword(s):  
Experimental Data ◽  
Pressure Drop ◽  
Mass Flux ◽  
Small Diameter ◽  
Water Mixture ◽  
Two Phase ◽  
Horizontal Orientation ◽  
Mini Channels ◽  
Total Mass Flux ◽  
Phase Pressure

Experimental results of adiabatic two-phase pressure drop in small diameter tubes are presented in this work. Air-water mixture is used as the working substance. Four test sections made of transparent acrylic tubes of different internal diameters ranging from 3.0 mm to 8.0 mm are used with different test section lengths from 150 mm to 400 mm. The investigation is carried out within the range of mass flux of water 16.58 -3050 kg/m2s, mass flux of air 8.25-204.10 kg/m2s and total mass flux 99.93-3184.69 kg/m2s. Some of the existing correlations for macro and mini-channels are compared with the experimental data. Based on the experimental data; a new correlation has been developed to predict two-phase pressure drop in horizontal channels.

A Study of Non-Equilibrium Two-Phase Pressure Drop in Converging Channels Supplied With Atomized Liquid

2006 ◽  
Author(s):  
J. D. Schwarzkopf ◽  
C. T. Crowe ◽  
B. Q. Li
Keyword(s):  
Numerical Model ◽  
Pressure Drop ◽  
Phase Change ◽  
Heat Fluxes ◽  
Two Phase ◽  
Converging Channel ◽  
Mini Channels ◽  
Phase Pressure ◽  
Good Agreement ◽  
Non Equilibrium

Two-phase pressure drop measurements are very difficult to make while the fluid is in non-equilibrium condition (i.e. while phase change is occurring). This is further complicated by the fact that supplying the channels with an initial quality comprised of atomized liquid and entrained gas changes the presupposed trends. The purpose of this paper is to present methods of measurement for fluctuating two-phase pressure drop in converging mini-channels with phase change (i.e. in the heat acquisition zone), an initial quality, and varying heat fluxes. The inlet and exit hydraulic diameters of the converging channel are 1.55mm and 1.17mm respectively and the fluid was PF5050. A numerical model was developed to understand the parameters contributing to the trends identified in the data. The numerical model includes the momentum effects of droplets from entrainment and atomization. The model shows good agreement with the experimental data.

Single and two-phase pressure drop in serpentine mini-channels

2011 ◽  
Vol 50 (8) ◽  
pp. 877-884 ◽  
Author(s):  
Adam A. Donaldson ◽  
Deepak M. Kirpalani ◽  
Arturo Macchi
Keyword(s):  
Pressure Drop ◽  
Two Phase ◽  
Mini Channels ◽  
Phase Pressure

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.

Evaluation Analysis of Prediction Methods for Two-Phase Flow Pressure Drop in Mini-Channels

2008 ◽  
Author(s):  
Licheng Sun ◽  
Kaichiro Mishima
Keyword(s):  
Pressure Drop ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Turbulent Region ◽  
Frictional Pressure Drop ◽  
New Correlation ◽  
Mini Channels ◽  
Flow Pressure ◽  
Better Than

2092 data of two-phase flow pressure drop were collected from 18 published papers of which the working fluids include R123, R134a, R22, R236ea, R245fa, R404a, R407C, R410a, R507, CO2, water and air. The hydraulic diameter ranges from 0.506 to 12mm; Relo from 10 to 37000, and Rego from 3 to 4×105. 11 correlations and models for calculating the two-phase frictional pressure drop were evaluated based upon these data. The results show that the accuracy of the Lockhart-Martinelli method, Mishima and Hibiki correlation, Zhang and Mishima correlation and Lee and Mudawar correalion in the laminar region is very close to each other, while the Muller-Steinhagen and Heck correlation is the best among the evaluated correlations in the turbulent region. A modified Chisholm correlation was proposed, which is better than all of the evaluated correlations in the turbulent region and its mean relative error is about 29%. For refrigerants only, the new correlation and Muller-Steinhagen and Heck correlation are very close to each other and give better agreement than the other evaluated correlations.

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