Heat transfer from a finned pin to the ambient air

Abstract

Extensive investigations employing fins as extended surfaces have been conducted, but relatively little experimental work has been conducted with pins, no information is available on the heat transfer characteristics of a pin and annular fin combination, i.e., a finned pin.

The increased surface area of a finned pin would promote more heat transfer. In this thesis a theoretical investigation of the basic heat transfer characteristics of a finned pin, and an experimental investigation to verify the theoretical result were conducted.

1. Theoretical investigation consists of:

(1) Optimum dimensions

(2) Sample calculation of optimum dimensions

(3) Derivation of heat transfer equations

(4) Sample calculations of heat flow-rate and temperature distribution

2. Experimental investigation consists of:

(1) Set-up of experimental equipment

(2) Measurements of heat flow-rate and temperature distribution

(3) Comparison of theoretical results with measured results

3. Conclusions: The conclusions were based on the comparison of the two-disc finned pin with the plain pin.

(1) For the two-disc finned pin employed in this thesis:

Increase in heat-flow-rate: 85%

Increase of effectiveness: 61%

(2) In general, the increase in heat flow-rate depends on the material, dimensions, temperature difference and spacing of annular fins.