| Title |
Two-Phase Flow Distribution, Phase Separation and Pressure Drop in Multi-Microchannel Tubes |
| Authors |
조홍기 ; 조금남 ; 윤백 ; 김영생 ; 김정훈 |
| Keywords |
Two-phase flow ; 이상유동 ; Flow distribution ; 유량분배 ; Phase separation ; 상분리 ; Pressure drop ; 압력강하 ; Microchannel tube ; 마이크로채널 튜브 |
| Abstract |
The present study investigated two-phase flow distribution, phase separation and pressure drop in multi-microchannel tubes under adiabatic condition. The test section consisted of inlet and outlet headers with the inner diameter of 19.4mm and 15 parallel microchannel tubes. Each microchannel tube brazed to the inlet and outlet headers and had 8 rectangular ports with the hydraulic diameter of 1.32mm. The key experimental parameters were orientation of header(horizontal and vertical), flow direction of refrigerant into the inlet header(in-line, parallel and cross flow) and inlet quality(0.1, 0.2 and 0.3). It was found that the orientation of the header had relatively large effect on the flow distribution and phase separation, while the inlet quality didn't affect much on them. The horizontal header showed the better flow distribution and phase separation characteristics than the vertical one. The parallel flow condition with the horizontal header showed the best performance for the flow distribution and phase separation characteristics under the test conditions. Two-phase pressure drops through the microchannel tubes with the horizontal header were higher than those of the microchennel tubes with the vertical header due to gravitational effect. |