Heat (Mass) Transfer in a Diagonally Oriented Rotating Two-Pass Channel With Rib-Roughened Walls Academic Article uri icon

abstract

  • Naphthalene sublimation studies were carried out to investigate the effects of channel orientation, rotational Coriolis force, and a sharp turn, on the local heat (mass) transfer distributions in a two-pass square channel with rib-roughened walls, rotating about a perpendicular axis. The test channel was oriented so that the rotation direction was perpendicular or at a 45° angle to the leading and trailing walls. The direction of rotation, a sharp turn, and the rib configuration considerably affected the local heat (mass) transfer distributions in a rotating two-pass square channel with rib-roughened leading and trailing walls. The heat (mass) transfer was very low on the leading wall of the first pass when the channel was oriented with the rotating direction normal to the leading and trailing walls. Regions of very low heat (mass) transfer on both the leading and trailing walls in the turn were observed, particularly on the trailing wall in the turn when the channel with transverse ribs was oriented diagonally. For the given diagonal channel orientation, rotational Coriolis forces caused the leading and trailing wall heat (mass) transfer to be high near the outer edges of the walls in the channel with transverse ribs. Rotation-induced secondary flows dominated near wall rib-induced secondary flows in the channel with angled ribs, since the heat (mass) transfer was higher near the outer edges of the wall than near the inner edges in the first and second straight passes.

author list (cited authors)

  • Park, C. W., Yoon, C., & Lau, S. C.

citation count

  • 23

publication date

  • August 1999