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Experiments on thermoacoustic convection heat transfer in gravity and zero-gravity environmentsThe results of an experimental study of thermoacoustic convection (TAC) heat transfer in gravity and zero-gravity environments are presented. The experimental apparatus consisted of a cylinder containing air as the compressible fluid. The enclosed air was heated electrically at the top surface which consisted of a thin high-resistance steel foil connected to a power source. Thermocouples were used to measure the transient temperature of the air on the axis of the cylinder and the heated surface in the both zero-gravity and gravity environments. The zero-gravity tests were performed in the Zero-Gravity Drop Tower Facility of NASA-Lewis Research Center. The experimental results were corrected for the error due to radiation absorption by the thermocouples. A conduction-only numerical heat transfer model was developed to compute the transient air temperature in the cylindrical geometry. The results were compared to the experimental data to determine the significance of the thermoacoustic convection heat transfer mechanism. It is observed that the rate of heat transfer to the air measured during the experiments is consistently higher than that obtained by the conduction-only solution indicating a significant presence of the TAC heat transfer. Further experiments are planned to measure directly (1) the radiative heat transfer contribution to the rise in the air temperature, and (2) the air pressure oscillations within the cylinder that are responsible for the convective heat transfer mode.
Document ID
19870055867
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Parang, Masood
(Tennessee, University Knoxville, United States)
Salah-Eddine, Adel
(Tennessee Univ. Knoxville, TN, United States)
Date Acquired
August 13, 2013
Publication Date
June 1, 1987
Subject Category
Materials Processing
Report/Patent Number
AIAA PAPER 87-1651
Accession Number
87A43141
Funding Number(s)
CONTRACT_GRANT: NAG3-239
Distribution Limits
Public
Copyright
Other

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