Numerical Analysis of Convection Heat Transfer from an Array of variable size Circular Perforated Fins

The present study focus on a numerical simulation of three dimensional, turbulent convection heat transfers from an array of rectangular perforated fins with various perforation sizes. The perforations considered are circular channels along the length of fins and the number of perforations is equal to 3. For investigation, incompressible air as working fluid is modeled using Navier–Stokes equations and RNG based k-ε turbulent model is used to predict turbulent flow parameters. Temperature field inside the fins is obtained by solving Fourier’s conduction equation. The conjugate differential equations for both solid and gas phase are solved simultaneously by finite volume procedure using SIMPLE algorithm. Flow and heat transfer characteristics are presented for Reynolds numbers from 2×104 to 4×104 based on the fin length and Prandtl number of Pr = 0.71. Numerical model is first validated with previous experimental studies and good agreements are observed. Based on a valid numerical model, numerical solution is continued to find flow field and temperature distribution for various perforation size. Results show that for a specific type of perforation, fin effectiveness is higher than other type.

کلیدواژه ها:

Perforated fin ، perforation size ، fin effectiveness ، heat transfer enhancement ، turbulent convection flow