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A SERIES OF HEAT TRANSFER EXPERIMENTS FOR THE MECHANICAL ENGINEERING TECHNOLOGY STUDENT

W.R. Kaminski Professor and Coordinator Mechanical Engineering Technology Central Washington University Ellensburg, WA 98926

Abstract

A series of five heat transfer experiments that are used to teach the laboratory component for a Mechanical Engineering Technology (MET) heat transfer course at Central Washington University (CWU) are presented in this paper. The experiments have been found to be very useful in bridging the gap between theory and hands-on experience. The experiments that will be described in this paper are referred to as: (1) Transient Lumped Mass Heat Transfer, (2) Pin Fin Characterization, (3) Contact Resistance Measurement, (4) Electrically Heated Tube Forced Convection, and (5) Free Convection From a Vertical Heated Surface.

These experiments have all been built by MET students at a relatively low cost and fully tested over the last several years. Design details and approximate costs are presented in the paper so that others may benefit from our experiences. The paper contains a set of test data from each experiment so that the reader may judge the effectiveness of the experiment. All of the experiments utilize state-of-the-art instrumentation and data systems, most of which have been donated by local industry. The students extensively utilize computers for data storage and processing using spread sheets.

The experience gained at CWU in the use of these experiments has been very positive in terms of comments and performance by our students, many of which are non-traditional. Heat transfer at the Engineering Technology level can be difficult to teach, which makes a well thought out set of laboratory experiments crucial to the successful learning of the subject.

Nomenclature 2 A cross-sectional area, in 2 As surface area, in Bi Biot Number o C specific heat, BTU/lbm- F 2 D flow passage diameter, in 2 o h convective heat transfer coefficient, BTU/sec-in - F 2 o hc contact resistance coefficient, BTU/sec-in - F o k thermal conductivity, BTU/sec-in- F o kf thermal conductivity evaluated at the film temperature, BTU/sec-in- F Pn pressure at location n ( n = 0, 1, 2, 3 ...), psia

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Kaminski, W. (1998, June), A Series Of Heat Transfer Experiments For The Mechanical Engineering Technology Student Paper presented at 1998 Annual Conference, Seattle, Washington. 10.18260/1-2--7398