Micro channels with manufacturing roughness levels

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Abstract

There are heat transfer advantages to reducing the size of channels used for internal cooling gas turbine components. As channel sizes decrease, however, there are concerns as to how manufacturing surface roughness may affect the channels expected pressure drop and heat transfer. For micro channel size scales, in particular, there is relatively little data indicating the effect of manufacturing roughness levels. The focus of this paper is to describe the development and validation of a testing method for micro channels as well as determine the effect of manufacturing roughness levels on these small channels. Convective heat transfer coefficients and friction factors were deduced based on measured flow conditions and known boundary conditions. It was shown that at an average roughness height of 6.1 μm, which corresponded to 2.2% of the channel height, heat transfer was augmented by 1.1-1.2 while the friction factor was augmented significantly more by 2.1-2.6 over a smooth channel.

Original languageEnglish (US)
Title of host publicationASME Turbo Expo 2010
Subtitle of host publicationPower for Land, Sea, and Air, GT 2010
Pages413-422
Number of pages10
EditionPARTS A AND B
DOIs
StatePublished - Dec 1 2010
EventASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010 - Glasgow, United Kingdom
Duration: Jun 14 2010Jun 18 2010

Publication series

NameProceedings of the ASME Turbo Expo
NumberPARTS A AND B
Volume4

Other

OtherASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010
CountryUnited Kingdom
CityGlasgow
Period6/14/106/18/10

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All Science Journal Classification (ASJC) codes

  • Engineering(all)

Cite this

Weaver, S. A., Barringer, M. D., & Thole, K. A. (2010). Micro channels with manufacturing roughness levels. In ASME Turbo Expo 2010: Power for Land, Sea, and Air, GT 2010 (PARTS A AND B ed., pp. 413-422). (Proceedings of the ASME Turbo Expo; Vol. 4, No. PARTS A AND B). https://doi.org/10.1115/GT2010-22976