Two-Phase Flow Distribution in a Compact Heat Exchanger Header

2003 ◽  
Author(s):  
Jong-Soo Kim ◽  
Yong-Bin Im ◽  
Jae-Hong Kim ◽  
Ki-Taek Lee
Keyword(s):  
Heat Exchanger ◽  
Two Phase Flow ◽  
Phase Distribution ◽  
Flow Distribution ◽  
Compact Heat Exchanger ◽  
Phase Flow ◽  
Two Phase ◽  
Insertion Depth ◽  
Different Types ◽  
Uniform Liquid

In this paper an experimental study was investigated for two-phase distribution in compact heat exchanger header. A test section was consisted of the horizontal header (circular tube: φ 5 mm × 80 mm) and 10 upward circular channels (φ 1.5 mm × 850 mm) using acrylic tube. Three different types of tube insertion depth were tested for the mass flux and inlet quality ranges of 50–200 kg/m2s and 0.1–0.3, respectively. Air and water were used as the test fluids. The distribution of vapor and liquid is obtained by measurement of the total mass flow rate and the calculation of the quality. Two-phase flow pattern was observed, and pressure drop of each channel was measured. By adjusting the insertion depth of each channel a uniform liquid flow distribution through the each channel was able to solve the mal-distribution problem.

Two-phase flow distribution of R410A within the vertical header of a microchannel heat exchanger

2017 ◽  
Vol 2017.27 (0) ◽  
pp. 427
Author(s):  
Mark Anthony REDO ◽  
Niccolo GIANNETTI ◽  
Jongsoo JEONG ◽  
Koji ENOKI ◽  
Ikuhide OTA ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Two Phase Flow ◽  
Flow Distribution ◽  
Phase Flow ◽  
Two Phase ◽  
Microchannel Heat Exchanger

Numerical Modeling of Two-Phase Flow Distribution Inside Evaporator Headers

2014 ◽  
Vol 6 (3) ◽  
Author(s):  
Miad Yazdani ◽  
Abbas A. Alahyari ◽  
Hailing Wu ◽  
Thomas D. Radcliff
Keyword(s):  
Heat Exchanger ◽  
Two Phase Flow ◽  
Flow Distribution ◽  
Operating Conditions ◽  
Phase Flow ◽  
Predictive Tool ◽  
Two Phase ◽  
Imaging Results ◽  
Discretization Schemes ◽  
Long Time

Two-phase flow distribution inside evaporator headers has been a challenging problem for a long time and having a robust predictive tool could substantially alleviate the costs associated with experimentation with different concepts and configurations. The use of a two-phase CFD model to predict flow distribution inside the header and at the discharge ports is demonstrated in this paper. The numerical domain is comprised of an inlet pipe and a distributor tube representing the header with a series of discharge ports. The flow distribution was initially verified using an air–water experiment, where the two-phase modeling approach, mesh requirements, and discretization schemes were defined. Next, the model was used to predict distribution of R134a in a typical heat exchanger distributor. The flow distribution across the discharge ports was provided to a discretized correlation-based heat exchanger model to predict the temperature and quality distribution along the length of the heat exchanger. The resultant temperature distribution is validated against IR imaging results for various operating conditions and header orientations.

Numerical Modeling of Two-Phase Flow Distribution Inside Evaporator Headers

2012 ◽  
Author(s):  
Miad Yazdani ◽  
Hailing Wu ◽  
Abbas A. Alahyari ◽  
Thomas D. Radcliff
Keyword(s):  
Heat Exchanger ◽  
Two Phase Flow ◽  
Flow Distribution ◽  
Operating Conditions ◽  
Phase Flow ◽  
Predictive Tool ◽  
Two Phase ◽  
Imaging Results ◽  
Discretization Schemes ◽  
Long Time

Two-phase flow distribution inside evaporator headers has been a challenging problem for a long time and having a robust predictive tool could substantially alleviate the costs associated with experimentation with different concepts and configurations. The use of a two-phase CFD model to predict flow distribution inside the header and at the discharge ports is demonstrated in this paper. The numerical domain is comprised of an inlet pipe and a distributor tube representing the header with a series of discharge ports. The flow distribution was initially verified using an air-water experiment, where the two-phase modeling approach, mesh requirements, and discretization schemes were defined. Next, the model was used to predict distribution of R134a in a typical heat exchanger distributor. The flow distribution across the discharge ports was provided to a discretized correlation-based heat exchanger model to predict the temperature and quality distribution along the length of the heat exchanger. The resultant temperature distribution is validated against IR imaging results for various operating conditions and header configurations.

Characterization of two-phase flow distribution in microchannel heat exchanger header for air-conditioning system

2019 ◽  
Vol 106 ◽  
pp. 183-193 ◽  
Author(s):  
Mark Anthony Redo ◽  
Jongsoo Jeong ◽  
Niccolo Giannetti ◽  
Koji Enoki ◽  
Seiichi Yamaguchi ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Air Conditioning ◽  
Two Phase Flow ◽  
Flow Distribution ◽  
Phase Flow ◽  
Two Phase ◽  
Air Conditioning System ◽  
Microchannel Heat Exchanger

A Relation Between Two-Phase Pressure Drop and Flow Distribution in a Compact Heat Exchanger Header

2004 ◽  
Author(s):  
Jong-Soo Kim ◽  
Ki-Taek Lee ◽  
Jae-Hong Kim ◽  
Soo-Jung Ha ◽  
Yong-Bin Im
Keyword(s):  
Experimental Study ◽  
Heat Exchanger ◽  
Pressure Drop ◽  
Single Phase ◽  
Small Diameter ◽  
Flow Distribution ◽  
Compact Heat Exchanger ◽  
Phase Flow ◽  
Two Phase ◽  
Phase Pressure

In this paper an experimental study was performed for relation between two-phase pressure drop and flow distribution in compact heat exchanger using small diameter tubes. We performed the experimental study in non-heating mode. A test section was consisted of the horizontal header (circular tube: φ 5 mm × 80 mm) and 10 upward circular channels (φ 1.5 mm × 850 mm) using acrylic tube. Three different types of tube insertion depth were tested for the mass flux and inlet quality ranging from of 50–200 kg/m2s and 0.1–0.3, respectively. Air and water were used as the test fluids. Two-phase pressure drop of each channel and three type of distribution header was measured. As whole, single-phase and two-phase, pressure drop in rear channel is found to be lower than that in front channel. In conclusion, we can claim that principle of distribution is almost same pressure drop in each channel. Comparing pressure drop in branch tube with correlation equation, it was found that in single-phase flow, experimental value was 10% lower than Hagen-Poiseuille, Blasius equation (Eq. 40) in two-phase flow.

Study on Distribution Performance of a New Oil-Air Distributor in Oil-Air Lubrication System

2014 ◽  
Vol 889-890 ◽  
pp. 352-357
Author(s):  
Qi Guo Sun ◽  
Zheng Hui Zhou ◽  
Hong Bo Lv ◽  
Yue Fei Wang
Keyword(s):  
Two Phase Flow ◽  
Phase Distribution ◽  
Spherical Surface ◽  
Flow Distribution ◽  
Domain Model ◽  
Conical Surface ◽  
Phase Flow ◽  
Lubrication System ◽  
Two Phase ◽  
Air Lubrication

The fluid domain model of a new oil-air distributor in oil-air lubrication system is built and the phase distribution of oil and air two-phase flow on distribution interface is simulated based on the CFD model in Fluent, the mass flow rate of oil and air are collected from three different cross sections when the structures of oil-air guidance slot are designed as a plane, sphere and cone shape respectively, then the influence of oil-air guidance slot structure on the performance of distributor is analyzed in the oil-air lubrication system in this paper. The results show that the spherical surface and conical surface of oil-air guidance slot can improve the uniformity and stability of the oil and air two-phase flow distribution, promote the flow pattern to form a continuous annular oil film. Among these three structures of oil-air guidance slot, we also find that the distribution performance of conical surface is the best.

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