The effect of roughness element thermal conductivity on turbulent convection.

Many flows of engineering interest occur over surfaces that exhibit roughness with thermal conductivities much lower than common metals and alloys. This is especially true of in-service gas turbine blades with surface depositions. Depending on the local convection coefficients, low thermal conductivity deposits may create situations where temperature changes along the heights of the elements are important and must be considered in predicting the overall surface convection coefficient. Using four test plates constructed with hexagonal distributions of hemispheres or cones made of either aluminum or ABS plastic, a series of experiments were performed in the Baylor University Subsonic Wind Tunnel to investigate the effects of roughness element thermal conductivities on turbulent convection. Results indicate that the packing density of the elements and the enhancement on the floor of the roughness distribution compete with the roughness element thermal conductivity in determining the overall convection enhancement.

Name thesis:degree_name

M.S.M.E.

Level thesis:degree_level

Masters

Grantor

Baylor University.

Year dc:date.issued

2011

Author dc:creator

• Mart, Steven Robert.

Advisor dc:contributor.advisor

• McClain, Stephen Taylor.

• Roughness.
• Thermal conductivity.
• Gas turbine engine.
• Convection.
• Turbulence.

Statement dc:rights

• Baylor University works are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. Contact libraryquestions@baylor.edu for inquiries about permission.

Language dc:language.iso

en

Handle dc:identifier.uri

https://hdl.handle.net/2104/8154

OAI identifier oai:identifier

oai:baylor-ir.tdl.org:2104/8154