HEAT/MASS TRANSFER CHARACTERISTICS IN ROTATING TWO-PASS SQUARE CHANNELS WITH $90^{\circ}$RIBS

$90^{\circ}$요철이 설치된 회전하는 정사각 이차 유로에서의 열/물질전달 특성

The present study investigates heat/mass transfer characteristics in rotating two-pass ducts of three different aspect ratios with 90-ribbed surfaces. The results show that the flows generated by the 180-turn, rib turbulators, and duct rotation. The curvature of the 180-turn produces Dean vortices causing high heat/mass transfer in the turning region and in the upstream region of the second-pass. The rib turbulators disturb the main flow by producing reattachment and separation near the ribbed surfaces, and increase heat/mass transfer in the region between the ribs. As the rotation number increases, the heat/mass transfer discrepancy between the leading and the trailing surfaces become larger.