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 microchannel 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 microchannels as well as to 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 , 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.
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e-mail: sweaver@sandia.gov
e-mail: mbarringer@psu.edu
e-mail: kthole@psu.edu
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October 2011
Research Papers
Microchannels With Manufacturing Roughness Levels
S. A. Weaver,
S. A. Weaver
Department of Mechanical and Nuclear Engineering,
e-mail: sweaver@sandia.gov
The Pennsylvania State University
, University Park, PA 16802
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M. D. Barringer,
M. D. Barringer
Department of Mechanical and Nuclear Engineering,
e-mail: mbarringer@psu.edu
The Pennsylvania State University
, University Park, PA 16802
Search for other works by this author on:
K. A. Thole
K. A. Thole
Department of Mechanical and Nuclear Engineering,
e-mail: kthole@psu.edu
The Pennsylvania State University
, University Park, PA 16802
Search for other works by this author on:
S. A. Weaver
Department of Mechanical and Nuclear Engineering,
The Pennsylvania State University
, University Park, PA 16802e-mail: sweaver@sandia.gov
M. D. Barringer
Department of Mechanical and Nuclear Engineering,
The Pennsylvania State University
, University Park, PA 16802e-mail: mbarringer@psu.edu
K. A. Thole
Department of Mechanical and Nuclear Engineering,
The Pennsylvania State University
, University Park, PA 16802e-mail: kthole@psu.edu
J. Turbomach. Oct 2011, 133(4): 041014 (8 pages)
Published Online: April 21, 2011
Article history
Received:
July 1, 2010
Revised:
July 8, 2010
Online:
April 21, 2011
Published:
April 21, 2011
Citation
Weaver, S. A., Barringer, M. D., and Thole, K. A. (April 21, 2011). "Microchannels With Manufacturing Roughness Levels." ASME. J. Turbomach. October 2011; 133(4): 041014. https://doi.org/10.1115/1.4002991
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