Universiti Teknologi Malaysia Institutional Repository

Numerical evaluation of spiral counter flow heat tecirculating burner

Othman, Muhammad Firdaus and Mat Zin, Ahmad Faiz (2008) Numerical evaluation of spiral counter flow heat tecirculating burner. In: Advances in Thermo-Fluids. Penerbit UTM , Johor, pp. 99-104. ISBN 978-983-52-0541-5

[img]
Preview
PDF
50Kb

Official URL: http://www.penerbit.utm.my/bookchapterdoc/FKM/book...

Abstract

Fins are usually employed in heat exchangers such as cooling coils and condensers to enhance the heat transfer between two unmixed fluids. The heat transfer enhancement results from the increase in the external surface area of the heat exchanger. The performance of fins is usually expressed as fin efficiency, defined as the ratio of the actual fin heat transfer to the maximum heat transfer if the whole fin was at the fin base temperature (Threlkeld, 1970). Analytical solution of efficiency of dry annular fins are reported in many handbooks (Kraus et al (2001), Incropera et al (1996). The solution is complex because it requires the calculation of modified Bessel functions of the first and second kind. Approximations are usually made to avoid the use of Bessel functions. Using Schmidt approximation, fin efficiency can be calculated within 0.01 of the exact value for efficiencies greater than 0.5 (Schmidt, 1949). Hong and Webb (1996) proposed a modification of the Schmidt equation for better accuracy. In this paper, a simple and accurate method is proposed.

Item Type:Book Section
Uncontrolled Keywords:dry circular fin, Bessel functions
Subjects:T Technology > TJ Mechanical engineering and machinery
Divisions:Mechanical Engineering
ID Code:24942
Deposited By: Ms Zalinda Shuratman
Deposited On:26 Apr 2012 06:30
Last Modified:26 Apr 2012 06:30

Repository Staff Only: item control page