FLOW BOILING HEAT TRANSFER AND FLOW DISTRIBUTION IN NON-UNIFORMLY HEATED PARALLEL MINI-CHANNELS

2018 ◽  
Author(s):  
Kizuku Kurose ◽  
Kazushi Miyata ◽  
Yoshinori Hamamoto ◽  
Hideo Mori
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Flow Boiling ◽  
Flow Distribution ◽  
Flow Boiling Heat Transfer ◽  
Mini Channels

Prediction for Saturated Flow Boiling Heat Transfer in Mini-Channels

2013 ◽  
Author(s):  
Minxia Li ◽  
Chaobin Dang ◽  
Xing Fu ◽  
Yitai Ma
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Flow Boiling ◽  
Velocity Ratio ◽  
Heat Fluxes ◽  
Saturated Flow ◽  
Operation Conditions ◽  
Flow Boiling Heat Transfer ◽  
Wide Range ◽  
Mini Channels

A superposition correlation is proposed to predict heat transfer coefficient of flow boiling heat transfer in mini-channels. In this correlation, Reynolds number of liquid phase is presented by means of vapor velocity and slip velocity ratio. The film thickness and Bo number are taken account into this correlation. This new correlations were developed based on the conditions contained in our database. A database on experimental results of saturated-flow boiling in mini-channels includes 3839 data points, 9 different refrigerants, and covers a wide range of operation conditions from 10 independent studies. Most inner diameters in this database is within 0.5 mm and 3 mm and the mass fluxes in the database range from 50 to 600 kg /m2s, the heat fluxes from 5 to 123 kW/m2, the vapor qualities from 0 to 1, and the saturation temperatures from 0 to 52 °C. Research advances of flow boiling heat transfer in mini-channels in recent years were reviewed. 12 available flow boiling heat transfer correlations were addressed and evaluated against the database in this study. The proposed correlation can catch 77% data within the deviation of±30%. The mean absolute error of this new correlation is 20.9%.

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