TURBULENT DIFFUSION OF SCALAR AND HEAT IN AN OFF-SOURCE HEATED STEADY ROUND JET

Singhal, R and Ravichandran, S and Diwan, SS (2022) TURBULENT DIFFUSION OF SCALAR AND HEAT IN AN OFF-SOURCE HEATED STEADY ROUND JET. In: 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022, 19 - 22 July 2022, Osaka, Virtual.

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Abstract

We study, using direct numerical simulation (DNS), the properties of a steady jet heated externally in a heat-injection zone, the rate of heat addition being proportional to the local concentration of a scalar. We examine the turbulent diffusivities of the scalar concentration, the temperature and the axial momentum, and compare their values with those for unheated jets and plumes. We also include results from the available literature and compare them with our results where possible. We find that external heat addition decreases the turbulent scalar diffusivity, leading to a decrease in the ratio of scalar to velocity flow widths relative to the unheated jet to a value that is largely insensitive to the precise details of heat addition, expect for one study. We also find that while the turbulent thermal diffusivity also decreases, the ratio of temperature to velocity flow widths is similar to those for unheated plumes. Our results suggest that further studies of off-source heated jets are warranted. © 2022 12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022. All rights reserved.

Item Type:	Conference Paper
Publication:	12th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2022
Publisher:	International Symposium on Turbulence and Shear Flow Phenomena, TSFP
Additional Information:	The copyright for this article belongs to International Symposium on Turbulence and Shear Flow Phenomena, TSFP
Keywords:	Diffusion; Turbulence, Direct-numerical-simulation; Flow width; Heat additions; Heat injection; Property; Round jets; Steady jet; Turbulent diffusion; Turbulent diffusivities; Velocity flow, Shear flow
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	22 Jan 2023 06:08
Last Modified:	22 Jan 2023 06:08
URI:	https://eprints.iisc.ac.in/id/eprint/79220

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