Bulletin of the American Physical Society
75th Annual Meeting of the Division of Fluid Dynamics
Volume 67, Number 19
Sunday–Tuesday, November 20–22, 2022; Indiana Convention Center, Indianapolis, Indiana.
Session G12: Acoustics: Thermo I
3:00 PM–4:05 PM,
Sunday, November 20, 2022
Room: 139
Chair: Aimee Morgans, Imperial
Abstract: G12.00002 : Mass and Heat Fluxes in a Phase Change Thermoacoustic Heat Pump*
3:13 PM–3:26 PM
Presenter:
Nathan H Blanc
(Technion - Israel Institute of Technology)
Authors:
Nathan H Blanc
(Technion - Israel Institute of Technology)
Rui Yang
(Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, China)
Guy Z Ramon
(Technion - Israel Institute of Technology)
Here, we present experimental characteristics of a phase change thermoacoustic heat pump, accompanied by calculations based on a theoretical a low-amplitude linear model. We show that for low temperature differences, such a device can outperform its “dry” equivalent by up to a factor of 3, in terms of cooling power and coefficient of performance (COP). At higher temperature differences, the trend is reversed, with the dry system outperforming the wet one. We show that this is due to a reversal in the direction of the acoustic-driven mass flux, and that this trend can be mitigated by increasing the local acoustic impedance. Finally, we outline the remaining challenges on the way to making this technology a reality, most of which are strongly related to fluid dynamics.
*Thanks to the grand Technion Energy Program and the Israeli ministry of energy for their support.
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