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Buoyancy driven mixing of miscible fluids by volumetric energy deposition of microwaves. | LitMetric

AI Article Synopsis

  • The experiment examines how buoyancy-driven mixing occurs when using microwaves to heat a lighter non-polar fluid on top of a heavier polar fluid.
  • The study focused on the pair of toluene and tetrahydrofuran (THF) due to its favorable properties for the experiment, which involves thermal expansion and density changes.
  • Results reveal insights into the initiation of buoyancy-driven mixing and highlight unique behaviors compared to standard Rayleigh-Taylor mixing phenomena.

Article Abstract

An experiment that seeks to investigate buoyancy driven mixing of miscible fluids by microwave volumetric energy deposition is presented. The experiment involves the use of a light, non-polar fluid that initially rests on top of a heavier fluid which is more polar. Microwaves preferentially heat the polar fluid, and its density decreases due to thermal expansion. As the microwave heating continues, the density of the lower fluid eventually becomes less than that of the upper, and buoyancy driven Rayleigh-Taylor mixing ensues. The choice of fluids is crucial to the success of the experiment, and a description is given of numerous fluid combinations considered and characterized. After careful consideration, the miscible pair of toluene/tetrahydrofuran (THF) was determined as having the best potential for successful volumetric energy deposition buoyancy driven mixing. Various single fluid calibration experiments were performed to facilitate the development of a heating theory. Thereafter, results from two-fluid mixing experiments are presented that demonstrate the capability of this novel Rayleigh-Taylor driven experiment. Particular interest is paid to the onset of buoyancy driven mixing and unusual aspects of the experiment in the context of typical Rayleigh-Taylor driven mixing.

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Source
http://dx.doi.org/10.1080/08327823.2013.11689859DOI Listing

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