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Estimation Of The Average Heat Transfer Coefficient For A Long Horizontal Cylindrical Fin Rod

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2004 Annual Conference


Salt Lake City, Utah

Publication Date

June 20, 2004

Start Date

June 20, 2004

End Date

June 23, 2004



Conference Session

TIME 9: Thermal Fluids/Fluid Mechanics

Page Count


Page Numbers

9.574.1 - 9.574.11

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Paper Authors

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Donald Mueller

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Hosni Abu-Mulaweh

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NOTE: The first page of text has been automatically extracted and included below in lieu of an abstract

Session 3666

Estimation of the Average Heat Transfer Coefficient for a Long Horizontal Cylindrical Fin Rod

Donald W. Mueller, Jr., Hosni I. Abu-Mulaweh Engineering Department Indiana University–Purdue University Fort Wayne Fort Wayne, IN 46805-1499, USA


The physical situation considered in this study is a horizontal, long rod of cylindrical cross-section with one end maintained at a constant elevated temperature. This paper examines the assumption that the heat transfer coefficient along the rod is constant and proposes a simple approach to esti- mate an average total heat transfer coefficient. The approach makes use of a published correlation for natural convection from a horizontal, isothermal cylinder and a simple model for the radiative heat transfer. A comparison is made to experimental results.


The efficient transfer of heat in many devices, such as electronic components and heat exchangers, is an engineering challenge and a topic of extensive study. In many such devices, fins are used to enhance the heat transfer. All fins operate by increasing the surface area from which the heat trans- fer can take place; however, a wide variety of configurations and operating conditions are possible. Fins have been the topic of many studies (see e.g. references in [1] and [2]) and a typical analysis is found in many textbooks, e.g. [3] and [4]. Most studies begin with the standard assumptions of Murray and Gardner as summarized in Ref. [1]: 1. The heat flow in the fin and its temperature remain constant in time, i.e. steady-state. 2. The fin material is homogeneous, its thermal conductivity is the same in all directions, and it remains constant. 3. The heat transfer coefficient to the fin is constant and uniform over the entire surface. 4. The temperature of the medium surrounding the fin is uniform and constant. 5. Temperature gradients across the fin cross-section may be neglected, i.e. one-dimensional. 6. The temperature at the base of the fin is uniform. 7. There is no contact resistance where the base of the fin joins the prime surface. 8. There are no heat sources within the fin itself.

­ Proceedings of the 2004 American Society for Engineering Education Annual Conference & Exposition Copyright c 2004, American Society for Engineering Education

Mueller, D., & Abu-Mulaweh, H. (2004, June), Estimation Of The Average Heat Transfer Coefficient For A Long Horizontal Cylindrical Fin Rod Paper presented at 2004 Annual Conference, Salt Lake City, Utah.

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