Heat Transfer Enhancement Using Angled Grooves as Turbulence Promoters
- 31 January 2014
- journal article
- Published by ASME International in Journal of Turbomachinery
- Vol. 136 (8), 081004
- https://doi.org/10.1115/1.4025733
Abstract
An experimental study is conducted on a simulated internal cooling channel of a turbine airfoil using angled grooves and combination of grooves-ribs to enhance the heat transfer from the wall. The grooves are angled at 45 deg to the mainstream flow direction and combinations of four different geometries are studied that include (1) angled grooves with a pitch, p/δ = 10, (2) angled groove with a larger pitch, p/δ = 15, (3) combination of angled groove and 45 deg angled rib, and (4) combination of angled groove with transverse rib. Transient liquid crystal experiments are conducted for a Reynolds number range of 13,000–55,000, and local and averaged heat transfer coefficient values are presented for all the geometries. Pressure drops are measured between the inlet and the exit of the grooved channel and friction factors are calculated. The combination of the angled groove and 45 deg angled rib provided the highest performance factor of the four cases considered, and these values were higher or comparable to among the best-performing rib geometries (45 deg broken ribs) commonly used in gas turbine airfoils.Keywords
This publication has 18 references indexed in Scilit:
- The investigation of groove geometry effect on heat transfer for internally grooved tubesApplied Thermal Engineering, 2008
- Darryl E. Metzger Memorial Session Paper: Experimental Heat Transfer and Friction in Channels Roughened With Angled, V-Shaped, and Discrete Ribs on Two Opposite WallsJournal of Turbomachinery, 1996
- Heat Transfer and Friction in Rectangular Channels With Ribbed or Ribbed-Grooved WallsJournal of Heat Transfer, 1994
- Heat transfer performance comparisons of five different rectangular channels with parallel angled ribsInternational Journal of Heat and Mass Transfer, 1992
- High performance heat transfer ducts with parallel broken and V-shaped broken ribsInternational Journal of Heat and Mass Transfer, 1992
- Augmented heat transfer in rectangular channels of narrow aspect ratios with rib turbulatorsInternational Journal of Heat and Mass Transfer, 1989
- Developing heat transfer in rectangular channels with rib turbulatorsInternational Journal of Heat and Mass Transfer, 1988
- Heat Transfer and Friction in Channels With Two Opposite Rib-Roughened WallsJournal of Heat Transfer, 1984
- Performance evaluation criteria for use of enhanced heat transfer surfaces in heat exchanger designInternational Journal of Heat and Mass Transfer, 1981
- An investigation of heat transfer and friction for rib-roughened surfacesInternational Journal of Heat and Mass Transfer, 1978