Simulación numérica de la convección mixta en un canal horizontal con aletas

Abstract

A numerical simulation for mixed convective

airflow through a horizontal finned channel

was carried out by means of a MATLAB® code.

Steady state and two dimensional conditions are

considered for solving the problem.

The discretization technique used was the

finite volume and the SIMPLE (Semi-Implicit

Pressure Linked Equations) algorithm was used

to link the pressure and velocity fields inside the

computational domain. The simulation was run

for several fluid flow parameters (Re=50, 100

and 200) and a temperature difference between

the hot wall and the fluid temperature at the

inlet which results in Richardson from Ri=0 to

Ri=4.16, then the results are for forced, natural

and mixed convective flow regimes.

As results are found that the local Nusselt

number and the recirculation zones increase

when the Reynolds is augmented and it is

inside the recirculation zone where the highest

values for the Nusselt are allocated. At higher

Richardson the size of the recirculation zones in

axial and transversal direction is augmented and

also higher magnitudes for vorticity are found.