Heat/Mass Transfer in a Rotating Two-Pass Channel with Transverse Ribs
- Additional Document Info
- View All
Naphthalene sublimation experiments have been conducted to study the local heat/mass transfer distributions on the rib-roughened leading and trailing walls of a rotating, two-pass, square channel, that models internal turbine blade cooling passages. The height of the transverse ribs was equal to one-tenth the spacing between the ribs, which was the same as the hydraulic diameter of the test channel. The Reynolds number and rotation number ranged up to 1 104 and 0.24, respectively. The results showed that, for radial outward flow in the first pass, there was very little spanwise variation of the local heat/ mass transfer between consecutive ribs on the trailing wall. When the rotation number was high, however, there was significant spanwise variation on the leading wall, with high heat/mass transfer in the middle of the wall and very low heat/mass transfer near the two side walls. For radial inward flow in the second pass, the sharp turn reduced the difference between the heat/mass transfer on the leading wall and that on the trailing wall. The sharp turn also caused spanwise asymmetric variation of the local heat/mass transfer between consecutive ribs in the second pass immediately downstream of the turn. Relative to the heat/mass transfer in a corresponding stationary channel, the overall heat/mass transfer in a rotating channel with rib-roughened walls was not affected by the Coriolis force as much as that in a rotating channel with smooth walls. Copyright 1997 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.
Journal of Thermophysics and Heat Transfer
author list (cited authors)
Park, C. W., Lau, S. C., & Kukreja, R. T.
complete list of authors
Park, CW||Lau, SC||Kukreja, RT