Proceedings of the
International Conference on Mechanical Engineering 2009
(ICME2009) 26- 28 December 2009, Dhaka, Bangladesh

ICME09-TH-22

EXPERIMENTAL INVESTIGATION OF HEAT TRANSFER
CHARACTERISTICS OF CYLINDRICAL FIN WITH
DIFFERENT GROOVES

Mohammad Mashud, Md. Shariful Islam, Z. Rahman Arani and Afsanul Tanveer
Department of Mechanical Engineering
Khulna University of Engineering & Technology (KUET), Khulna, Bangladesh

ABSTRACT

An experimental study was performed to provide information about the effect of pressure reduction on heat loss from cylindrical fins of three different geometries. A literature review shows that much of work on radiating fins has been carried out analytically and numerically. In this research, a solid cylindrical fin and two other cylindrical fins with circular grooves and threads on their outside surface are investigated experimentally. A test facility with a pressure reduction chamber and instrumentation is fabricated. The heat input to the fin is varied such that the base temperature is maintained constant under steady state. Based on a study of effect of pressure reduction, using available resources, the chamber is designed for a vacuum of 680 mm Hg. The experimental result shows that for cylindrical fin with circular grooves (depth 3.5mm) heat loss is a maximum. The grooved cylindrical fin loses approximately1.23 times greater heat per unit area, compared to the threaded cylindrical fin, and 2.17 times greater heat per unit area, respectively compared to the solid pin fin at a pressure lower than atmospheric pressure. As pressure decreases heat loss reduces and contribution of radiation heat transfer on total heat loss increases.

Keywords: Cylindrical Fin, Grooves, Heat Transfer and Pressure Reduction.

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