"Surface characteristics of a finned tube heat exchanger were examined to help predict the contact geometry between metal surfaces. These characteristics were the surface roughness and waviness and the material hardness. A scanning electron microscope was used to observe the surface topography of the fins as well as examining the contact between the aluminum fin and the copper tube.
Comparisons of the surface roughness were then made between heat exchangers having different fin numbers (20, 14, and 6) with the result that as the fin number decreased, the roughness also decreased. For a given fin number, it was discovered that the surface roughness increased as the expansion increased. These tests also revealed that, for the 14 fins/inch case, only a portion of the fin collar was actually in contact with the tube. This altered the earlier determined mathematical model used in predicting the heat transfer between the metals in contact"--Abstract, page ii.
Sheffield, John W.
Sauer, Harry J., Jr., 1935-2008
Leighly, Hollis P., 1923-2004
Mechanical and Aerospace Engineering
M.S. in Mechanical Engineering
American Society of Heating, Refrigerating and Air-Conditioning Engineers
University of Missouri--Rolla
viii, 65 pages
© 1983 Bobby Dale Stafford, All rights reserved.
Thesis - Restricted Access
Heat engineering -- Materials
Surfaces (Technology) -- Analysis
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Stafford, Bobby Dale, "Investigation of important surface characteristics of a finned tube heat exchanger" (1983). Masters Theses. 137.
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