[Seminar] Carl Jensen's PhD defense- April 28th, 9:30am

[Richard Raspet]

Carl Jensen will defend his PhD dissertation Tuesday April 28th at 9:30am in
the NCPA classroom, Room 1128.  Everyone is invited to his research
presentation which will last about 30 minutes and there will be an open
session for questions from the audience before the committee meets with
Carl.

 

Computational Thermoacoustics in Fibrous Stacks

Fibrous materials have been used successfully as the stack element in
thermoacoustic devices but analysis and measurement of all the
thermoacoustic properties  has not been performed successfully. The acoustic
thermoviscous functions that characterize the material can be measured
experimentally, but the gain component of the thermoacoustic wave equation
has proven difficult to measure [Simmons, 2003]. A theory has been proposed
[Roh et. al., 2007] that predicts the gain coefficient from the
thermoviscous functions but it has not been tested experimentally. For the
present work, a computational method has been developed for thermoacoustics
in a three-dimensional stack element that has been validated successfully
against analytical solutions for parallel pored stack geometries. The
simulated results for a fibrous geometry are compared against the predicted
thermoacoustic gain coefficient and it is found that the theory matches well
for the imaginary component, but that the real component is larger than the
theory predicts. This suggests that the theory underestimates the gain for a
fibrous stack in a traveling wave device while being a good approximation
for standing waves.

Simmons, T. (2003). Experimental Determination of Thermoacoustic Stack
Properties. PhD Dissertation: University of Mississippi

Roh, H.S., Raspet, R., Bass, H.E. (2007). J. Acoust. Soc. Am., 121(3),
1413-1422

 

 

 

 

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