Title: Effect of aspect ratio of semitransparent window on interaction of the collimated beam with natural convection: part 1

Authors: G. Chanakya; Pradeep Kumar

Addresses: Numerical Experiment Laboratory (Radiation & Fluid Flow Physics), School of Engineering, Indian Institute of Technology Mandi, Mandi, Himachal Pradesh, 175075, India ' Numerical Experiment Laboratory (Radiation & Fluid Flow Physics), School of Engineering, Indian Institute of Technology Mandi, Mandi, Himachal Pradesh, 175075, India

Abstract: The effect of the semitransparent window's aspect ratio, i.e., the height ratio (h_r) and window width ratio (w_r) and Planck numbers on the interaction of the collimated beam with natural convection has been investigated numerically. The cavity is convectively heated from the bottom, and a semitransparent window is created on the left wall, and a collimated beam is irradiated on the window at an azimuthal angle (ɸ) of 135°. The dynamics of two vortices inside the cavity change considerably by combination of window's aspect ratio and Planck number (Pl) of the medium. The thermal plume flickers depending on the situation of the dynamics of two vortices inside the cavity. The localised heating of the fluid happens mostly for the large height ratio of the semitransparent window. The conduction, radiation, and total Nusselt numbers are also greatly affected by the aspect ratio and Planck number of the medium.

Keywords: semitransparent wall; natural convection; collimated beam irradiation; symmetrical cooling; aspect ratio.

DOI: 10.1504/PCFD.2023.128735

Progress in Computational Fluid Dynamics, An International Journal, 2023 Vol.23 No.1, pp.34 - 51

Received: 08 Apr 2021
Accepted: 02 Dec 2021
Published online: 02 Feb 2023 *