Effect of rib-angle orientation on local mass transfer distribution in a three-pass rib-roughened channel
Conference Paper
Overview
Overview
abstract
In this experimental investigation of the heat transfer characteristics of turbulent air flow in a three-pass square channel, the test section consisted of three straight square channels jointed by two 180 turns, modeling the internal cooling passages of gas turbine airfoils. Naphthalene-coated ribs were attached to the top and the bottom walls of the naphthalene-coated, three-pass channel. The rib height-to-hydraulic diameter ratio was 0.063; the rib pitch-to-height ratio was 10; the rib angles were 90 and 60. For =60, both the crossed ribs (on two opposite walls of the cooling channel) and the parallel ribs (on two opposite walls of the cooling channel) were investigated. The combined effects of the two sharp 180 turns and the rib orientations on the distributions of the local mass transfer coefficient in the entire three-pass channel were determined.
