옵셋휜의 열유동 성능에 대한 수치해석적 연구

Abstract

A numerical study on the thermal and fluid flow performance of the offset fins has been conducted using Fluent code. Flow in the offset fin passage was modelled in 3-dimensions. A unit cell of offset fin geometry modelled for the computational domain was given the symmetric condition at the right and left side of the cell and the periodic condition at the entrance and exit of the cell. The ranges of the major flow parameters in this study are 30≤Re≤1200 and 0.7≤Pr≤335. The results were compared with the predictions of existing correlations. The f-factor results agreed well with the existing correlations except thicker and short length fins. Based on the Fluent analysis, a new f-factor correlation has been proposed and this new correlation showed better predictions for the thicker and shorter fins. The numerical result showed that j-factor was affected by Prandtl number.