Kinetic energy and scalar spectra in high Rayleigh number axially homogeneous buoyancy driven turbulence

Pawar, Shashikant S and Arakeri, Jaywant H (2016) Kinetic energy and scalar spectra in high Rayleigh number axially homogeneous buoyancy driven turbulence. In: PHYSICS OF FLUIDS, 28 (6).

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Abstract

Kinetic energy and scalar spectra from the measurements in high Rayleigh number axially homogeneous buoyancy driven turbulent flow are presented. Kinetic energy and concentration (scalar) spectra are obtained from the experiments wherein density difference is created using brine and fresh water and temperature spectra are obtained from the experiments in which heat is used. Scaling of the frequency spectra of lateral and longitudinal velocity near the tube axis is closer to the Kolmogorov-Obukhov scaling, while the scalar spectra show some evidence of dual scaling, Bolgiano-Obukhov scaling followed by Obukhov-Corrsin scaling. These scalings are also observed in the corresponding second order spatial structure functions of velocity and concentration fluctuations. Published by AIP Publishing.

Item Type:	Journal Article
Publication:	PHYSICS OF FLUIDS
Publisher:	AMER INST PHYSICS, USA
Additional Information:	Copy right for this article belongs to the AMER INST PHYSICS, USA
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	19 Aug 2016 05:51
Last Modified:	19 Aug 2016 05:51
URI:	http://eprints.iisc.ac.in/id/eprint/54378

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