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Rayleigh Taylor Experiments

[+] Author Affiliations
Sarat Kuchibhatla, Devesh Ranjan

Texas A&M University, College Station, TX

Paper No. IMECE2012-93087, pp. 1341-1351; 11 pages
doi:10.1115/IMECE2012-93087
From:
  • ASME 2012 International Mechanical Engineering Congress and Exposition
  • Volume 7: Fluids and Heat Transfer, Parts A, B, C, and D
  • Houston, Texas, USA, November 9–15, 2012
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-4523-3
  • Copyright © 2012 by ASME

abstract

Effect of multi-modal initial conditions on Rayleigh-Taylor instability (RTI) was experimentally studied at Texas A&M University. Precisely controllable initial conditions were generated using a flapper mechanism at the interface of two unstably stratified convective water streams with a temperature difference of about 7–8°C corresponding to Atwood numbers of the order of 10−3. By selecting input initial wavelengths and phase angles, a parametric study was performed to study the initial growth stages of this instability and mixing behavior. Using a servo controlled flapper mechanism and high resolution thermocouples, the quality and quantity of total and molecular mixing is studied. The topology of the characteristic bubble and spike structures in the initial mixing stages was recorded using high-resolution imaging. Density measurements using thermocouple measurements were performed at two downstream locations from the splitter plate, x/H = 0.077 and x/H = 0.908, where H is the total height of the Water Channel. Molecular mixing patterns due to single, binary and multi-mode initial conditions are extracted from density data.

Copyright © 2012 by ASME

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