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Distribution of Air-Water Two-Phase Flow in a Flat Tube Heat Exchanger  

Kim, Nae-Hyun (Department of Mechanical Engineering, University of Incheon)
Park, Tae-Gyun (Graduate School, University of Incheon)
Han, Sung-Pil (Graduate School, University of Incheon)
Shin, Tae-Ryong (Graduate School, University of Incheon)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.18, no.9, 2006 , pp. 687-697 More about this Journal
Abstract
The air and water flow distribution are experimentally studied for a heat exchanger composed of round headers and 10 flat tubes. The effects of tube protrusion depth as well as mass flux, and quality are investigated, and the results are compared with the previous 30 channel results. The flow at the header inlet is annular. For the downward flow configuration, the water flow distribution is significantly affected by the tube protrusion depth. For flush-mounted geometry, significant portion of the water flows through frontal part of the header. As the protrusion depth increases, more water is forced to the rear part of the header. The effect of mass flux or quality is qualitatively the same as that of the protrusion depth. Increase of the mass flux or quality forces the water to rear part of the header. For the upward flow configuration, different from the downward configuration, significant portion of the water flows through the rear part of the header. The effect of the protrusion depth is the same as that of the downward flow. As the protrusion depth increases, more water is forced to the rear part of the header. However, the effect of mass flux or quality is opposite to the downward flow case. As the mass flux or quality increases, more water flows through the frontal part of the header. Compared with the previous thirty channel configuration, the present ten channel configuration yields better flow distribution. Possible explanation is provided from the flow visualization results.
Keywords
Flat tube; Parallel flow; Heat exchanger; Header; Two-phase distribution; Air-water;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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