Heat transfer augmentation and vortex-induced vibration in a block-heated channel

The finite element method is used to solve the general Darcy-Brinkman-Forchheimer model and energy equation for the heat transfer augmentation and vortex-induced vibration from the square vortex-generator wrapped by a porous sheath in the block-heated channel. The heat transfer augmentation and vortex-induced vibration have been investigated by varying Darcy number, porosity, porous sheath thickness, and Reynolds number. The results show that as Reynolds number and porous sheath thickness increase, heat transfer augmentation and vortex-induced vibration increase. Nevertheless, the porosity slightly influences the heat transfer augmentation and vortex-induced vibration. As Darcy number equals 10(-4), a small vortex-generator wrapped with a porous sheath of E-P/w = 0.125 best augments overall heat transfer from the heated-block surfaces with a reduction of 53.94% in vortex-induced vibration. (C) 2013 Elsevier Masson SAS. All rights reserved.