| Title |
Effects of Discrete Ribs on Pressure Drop in a Rotating Two-Pass Duct |
| Keywords |
Coriolis force ; 코리올리력 ; Discrete ribs ; 단락요철 ; Heat/Mass transfer ; 열/물질전달 ; Pressure drop ; 압력강하 ; Rotating duct ; 회전덕트 |
| Abstract |
The present study has been conducted to investigate the effects of rotation on heat/mass transfer and pressure drop characteristics in a two-pass square duct with and without discrete ribs. For stationary cases, the heat/mass transfer on the surfaces with and without discrete ribs is almost the same or reduced. For rotating cases, the gap flow affects differently the heat/mass transfer on leading and trailing surfaces with discrete ribs. On the leading surface of the first pass, the heat/mass transfer is slightly enhanced due to generating strong gap flow. On the trailing surface of the first pass, however, the heat/mass transfer is much decreased because the gap flow disturbs impingement of main flow. The phenomenon, that is, the heat/mass transfer discrepancy between the leading and trailing surfaces is dis-tinctly presented with the increment of rotation number. The friction losses on each surface with discrete ribs are reduced because the blockage ratio decreases for both non-rotating and rotating cases. Therefore, high thermal performance appears in a duct with discrete ribs. |