Experimental study of thermoacoustic effects on a single plate Part I: Temperature fields |
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Authors: | M Wetzel C Herman |
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Institution: | (1) Department of Mechanical Engineering The Johns Hopkins University 3400 North Charles Street Baltimore, Maryland 21218, |
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Abstract: | The thermal interaction between a heated solid plate and the acoustically driven working fluid was investigated by visualizing
and quantifying the temperature fields in the neighbourhood of the solid plate. A combination of holographic interferometry
and high-speed cinematography was applied in the measurements. A better knowledge of these temperature fields is essential
to develop systematic design methodologies for heat exchangers in oscillatory flows. The difference between heat transfer
in oscillatory flows with zero mean velocity and steady-state flows is demonstrated in the paper. Instead of heat transfer
from a heated solid surface to the colder bulk fluid, the visualized temperature fields indicated that heat was transferred
from the working fluid into the stack plate at the edge of the plate. In the experiments, the thermoacoustic effect was visualized
through the temperature measurements. A novel evaluation procedure that accounts for the influence of the acoustic pressure
variations on the refractive index was applied to accurately reconstruct the high-speed, two-dimensional oscillating temperature
distributions.
Received on 22 March 1999 |
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Keywords: | |
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