Print ISSN: 1813-0526

Online ISSN: 2220-1270

Keywords : relative humidity


Heat Characteristics and Performance of Longitudinal Fin Exposed to Wet Air

Ziad M. Al-Makhyoul

Al-Rafidain Engineering Journal (AREJ), 2014, Volume 22, Issue 3, Pages 176-185
DOI: 10.33899/rengj.2014.88463

Abstract
A numerical study of the performance of longitudinal fin exposed to wet air has been carried out using finite difference technique. The temperature distribution over the fin surface was determined by using a third-degree polynomial correlation for the relationship between dry bulb temperature and humidity ratio for the saturated air at relative humidity of (0, 25, 50 and 100)% and length of fin from (0.01 to 0.1)m. Also, fin efficiency, fin effectiveness and heat transfer have been calculated. The effect of the atmospheric pressure was also considered. The study showed that the fin effectiveness and fin efficiency of a fin in the case of fully wet fin was found to be smaller than those in the dry fin and the temperature gradient at the tip for a dry fin was greater than that for the wet fin.

Key words: Longitudinal fins, relative humidity, heat transfer

Studyof the Effect of Relative Humidity on the Heat Transfer Characteristics for a Fin Exposed to Air at Different Conditions Ziad M. Al-Makhyoul

Ziad M. Al-Makhyoul

Al-Rafidain Engineering Journal (AREJ), 2012, Volume 20, Issue 6, Pages 77-89
DOI: 10.33899/rengj.2012.63395

A study of the effect of relative humidity on the two dimensional heat transfercharacteristics for thetwo types of annular fins of (constant thickness and variable thickness)has been carriedout using finite difference method and grid generation technique of algebraic method to simplify the geometry of fin. The temperature distribution for a fully wet fin and dry fin has been determinedat relative humidity of (0, 50, 75 and 100)%alsofin efficiency, fin effectiveness and heat transferhave been calculated for a range of relative humidity at (10, 20, 30, 40, 50 and 100)% and length of fin from (0.01 to 0.1)m. The effect of the atmospheric pressure was also studied. The study shows that the fin effectiveness and fin efficiency of a fin in the case of fully wet fin are found to be less than those in the dry fin andthe temperature gradient at the tip for a dry fin is greater than that for the wet fin

Key words: Annular fins, relative humidity, heat transfer