Experimental study on laminar flow forced-convection in a channel with upper V-corrugated plate heated by radiation

Abstract

Experimental study of the effects of the operating parameters on laminar flow forced-convection heat transfer for air flowing in a channel having a V-corrugated upper plate heated by radiation heat flux while the other walls are thermally insulated has been carried out. The parameters studied and their ranges were as follows: flow Reynolds number ( Re) ranging from 750 to 2050, incident radiation fluxes ( q inc) of 400, 700, and 1000 W/m 2, inlet air bulk temperatures ( T b,in) ranging from 12.4 to 59.4 °C and tilting angles of the channel ( β) of 0°, 15°, 30°, 45°, and 60°. The results show that, the effect of Re on local Nusselt number ( Nu x ) are clear and more significant at the channel entrance region. While, changing β from 0° to 60° leads to an increase in Nu x by a ratio ranging from 33% to 67.3% depending on Re values and other operating parameters. Increasing the q inc values by 175% and 250% leads to an increase in Nu x values by 26% and 50%, respectively. In addition, the results indicate that there are significant increases in Nu x in the channel entrance region due to the increase in inlet air bulk temperature and this influence diminishes downstream.