Computation of natural convection heat transfer from an infrared suppression device (IRS) with multiple louvered cylindrical funnels

Abstract

The current computational work investigates the buoyancy-driven flow and heat transfer in and around an Infrared suppression device (IRS) with perforated cylindrical funnels. It reports the effects of three critical parameters: the louver size ( 0.025 ≤ d / D ≤ 0.2 ) , diameter ratio of the funnel ( 1.02 ≤ DR ≤ 1.3 ) , and Rayleigh number ( 10 10 ≤ Ra ≤ 10 12 ) on the heat transfer rate, mass suction rate, thermal plume, and velocity vectors. It also proposes suitable correlations for the average Nusselt number and mass suction rate, having an accuracy of 5%, and 6%, respectively. The study’s outcomes show that the heat transfer rate increases with the louver size, only up to a particular value of diameter ratio, beyond which it reduces. However, the heat transfer rate with a louvered funnel is more than the plane funnels, except when DR =1.15 and 1.2 and d/D = 0.2 (approximately). The work also reports the temperature versus time curve for the IRS.