| Title |
Distribution of Air-Water Two-Phase Flow ina Header of Aluminum Flat Tube Evaporator |
| Keywords |
Flat tube evaporator ; 평판관 증발기 ; Parallel flow heat exchanger ; 평행류 열교환기 ; Header ; 헤더 ; Two-phase distribution ; 2상류 분배 ; Air-water ; 물-공기 |
| Abstract |
The air and water flow distribution are experimentally studied for a round header－flat tube geometry simulating a parallel flow heat exchanger. The number of branch flat tube is thirty. The effects of tube outlet direction, tube protrusion depth as well as mass flux, and quality are investigated. The flow at the header inlet is identified as annular. For the downward flow configuration, the water flow distribution is significantly affected by the tube protrusion depth. For flush-mounted configuration, most of the water flows through fron-tal 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, however, most of the water flows through rear part of the header. The protrusion depth, mass flux, or quality does not significantly alter the flow pattern. Possible explanations are provided based on the flow visualization results. Neg-ligible difference on the water flow distribution was observed between the parallel and the reverse flow configuration. |