| Title |
Effect of Inlet Geometries on the Two-Phase Flow Distribution at Header-Channel Junction |
| DOI |
http://dx.doi.org/10.6110/KJACR.2013.25.6.324 |
| Keywords |
유동분배 ; 2상 ; 헤더 ; 입구형상 Flow distribution ; Two-phase ; Header ; Inlet geometries |
| Abstract |
The main objective of this work is to experimentally investigate the effect of inlet geometries on the distribution of two-phase annular flow at header-channel junctions simulating the corresponding parts of compact heat exchangers. The cross-section of the header and the channels were fixed to 16 mm×16 mm and 12 mm×1.8 mm, respectively. Experiments were performed for the mass flux and the mass quality ranges of 30～140 kg/m2s and 0.3～0.7, respectively. Air and water were used as the test fluids. Three different inlet geometries of the header were tested：no restriction (case A), a single 8 mm hole at the center (case B), and nine 2 mm holes around the center (case C) at the inlet, respectively. The tendencies of the two-phase flow distribution were different, in each case. For cases B and C (flow resistance exists), more uniform flow distribution results were seen, compared with case A(no flow resistance), due to the flow pattern change to mist flow from annular flow at the inlet, and the flow recirculation near the end plate of the header. |