The impact of working gas on heat transfer performance of tube banks heat exchanger in a thermoacoustic system
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Date
2022-03Author
Lin, Chou Aw
Fatimah Al Zahrah, Mohd Saat
Fadhliah, Shikh Anuar
Mohamad Firdaus, Sukri
Mohd Zaid, Akop
Saechan, Patcharin
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Show full item recordAbstract
Thermoacoustic system is a system introduced as an alternative technology for refrigerators
or heat engine because it uses environmentally friendly gases as a working medium.
Thermoacoustic system usually uses noble gaseous as working medium and air has been
widely used since it is available abundantly and easy to handle when performing experiment.
Other than air, helium is also frequently used in thermoacoustic system because its low
Prandtl number is expected to improve the performance of thermoacoustic system. This
paper reports the computational results of heat transfer performance across tube banks
heat exchanger when air and helium are used in thermoacoustic environment. The transient
cases of thermoacoustics were solved using the Shear-Stress-Transport k-ω turbulence
model. The model was first validated with experimental results with air as the working fluid.
The validated model was then solved for helium. Results showed that helium offers higher
Nusselt number (6.52%) and Colburn-j factor (11.25%) compared to air at lower Reynolds
number. Hence, the study suggests that the use of helium gas is favorable if better heat
transfer is to be achieved in thermoacoustic energy system.