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Effects of compressibility and heat release on entrainment processes in mixing layers

Mathew, Joseph and Mahle, Inga and Friedrich, Rainer (2008) Effects of compressibility and heat release on entrainment processes in mixing layers. In: Journal of Turbulence, 9 (14). 1 -12.

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Abstract

Characteristics of the process of entrainment in plane mixing layers, and the changes with compressibility and heat release, were studied using temporal DNS with simultaneous fluid packet tracking. Convective Mach numbers of the simulations are 0.15, 0.7 and 1.1. The Reynolds number is quite high (between 11 000 and 37 000 based on layer width and velocity difference), and is above the mixing transition. The study agrees with recent findings in round jets: first, engulfed fluid volume and its growth rate are both very small compared with the volume of the turbulent region and its growth rate, respectively. Secondly, most often, the process occurs close to the turbulent-nonturbulent boundaries. A new finding is that both compressibility and heat release retard the entrainment process so that it takes an O(1) time for vorticity or scalar levels to grow even after growth has been initiated. This delay is manifested as the fall in mixing layer growth rates as compressibility and heat release levels increase.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Taylor and Francis Group.
Keywords: entrainment;compressible;heat release;mixing layer;DNS
Department/Centre: Division of Mechanical Sciences > Aerospace Engineering (Formerly, Aeronautical Engineering)
Date Deposited: 04 Jun 2010 07:02
Last Modified: 04 Jun 2010 07:02
URI: http://eprints.iisc.ernet.in/id/eprint/26178

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