Reactive Rayleigh-Taylor Turbulence

Details Reactive Rayleigh-Taylor Turbulence Reactive Rayleigh-Taylor Turbulence

2008-07-24

arxiv.org/abs/0807.3772v1

Physics

Fluid Dynamics

14 pages, 4 figures

Scientific paper

The Rayleigh-Taylor (RT) instability develops and leads to turbulence when a heavy fluid falls under the action of gravity through a light one. We consider this phenomenon accompanied by a reactive transformation between the fluids, and study with Direct Numerical Simulations (DNS) how the reaction (flame) affects the turbulent mixing in the Boussinesq approximation. We discuss "slow" reactions where the characteristic reaction time exceeds the temporal scale of the RT instability. In the early turbulent stage, effects of the flame are distributed over a maturing mixing zone, whose development is weakly influenced by the reaction. At later times, the fully mixed zone transforms into a conglomerate of pure-fluid patches of sizes proportional to the mixing zone width. In this "stirred flame'' regime, temperature fluctuations are consumed by reactions in the regions separating the pure-fluid patches. This DNS-based qualitative description is followed by a phenomenology suggesting that thin turbulent flame is of a single-fractal character, and thus distribution of the temperature field is strongly intermittent.

Affiliated with

Also associated with

No associations

Rating

Reactive Rayleigh-Taylor Turbulence does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Reactive Rayleigh-Taylor Turbulence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reactive Rayleigh-Taylor Turbulence will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-675757