Measurement of heat transfer and pressure drop in rectangular channels with turbulence promoters. Final report

Technical Report · Mon Sep 01 00:00:00 EDT 1986

OSTI ID:6487164

Han, J C; Park, J S; Ibrahim, M Y

Periodic rib turbulators were used in advanced turbine cooling designs to enhance the internal heat transfer. The objective of the present project was to investigate the combined effects of the rib angle of attack and the channel aspect ratio on the local heat transfer and pressure drop in rectangular channels with two opposite ribbed walls for Reynolds number varied from 10,000 to 60,000. The channel aspect ratio (W/H) was varied from 1 to 2 to 4. The rib angle of attack (alpha) was varied from 90 to 60 to 45 to 30 degree. The highly detailed heat transfer coefficient distribution on both the smooth side and the ribbed side walls from the channel sharp entrance to the downstream region were measured. The results showed that, in the square channel, the heat transfer for the slant ribs (alpha = 30 -45 deg) was about 30% higher that of the transverse ribs (alpha = 90 deg) for a constant pumping power. However, in the rectangular channels (W/H = 2 and 4, ribs on W side), the heat transfer at alpha = 30 -45 deg was only about 5% higher than 90 deg. The average heat transfer and friction correlations were developed to account for rib spacing, rib angle, and channel aspect ratio over the range of roughness Reynolds number.

• Research Organization: Texas A and M Univ., College Station (USA)
• OSTI ID: 6487164
• Report Number(s): N-87-17003; NASA-CR-4015; E-3164; NAS-1.26:4015
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420400* -- Engineering-- Heat Transfer & Fluid Flow
421000 -- Engineering-- Combustion Systems
COOLING
DATA
ENERGY TRANSFER
EXPERIMENTAL DATA
GAS TURBINES
HEAT TRANSFER
INFORMATION
MACHINERY
NUMERICAL DATA
PRESSURE DROP
REYNOLDS NUMBER
TURBINES
TURBOMACHINERY
TURBULENCE