Daeho Im

Document Type

Thesis - University Access Only

Award Date


Degree Name

Master of Science (MS)

Department / School

Mechanical Engineering


Pressure drops across finned sections were obtained experimentally for various combinations of fin length, fin height, fin thickness, number of fins, and Reynolds number. The pressure drop was expressed in terms of the flow kinetic energy and a loss coefficient. The results showed that the number of fins had the largest effect on the loss coefficient. The fin thickness had the second largest effect. The fin length and Reynolds number had about equal effects, and was the third largest effect. The fin height appeared to have little effect. A general prediction equation for the loss coefficient was obtained which gave results that were within ±20% of the experimental values. Two other less restrictive prediction equations gave results that were within ±5% and ±10% of the experimental values. Experiments were run on fins with 1-inch, 3-inch, and 6-inch lengths; 0.25-inch and 0.125-inch thickness; 0.75-inch, 1-inch, 1.25-inch, and 1.5-inch heights; sections with 2, 4, and 8 fins; and a Reynolds number range of about 20,000 to 70,000. The fins were rectangular in shape and the tests run in a rectangular channel. A total of four hundred and thirty two test runs were made.

Library of Congress Subject Headings

Heat -- Transmission



Number of Pages



South Dakota State University