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Appl. Sci. 2017, 7(8), 784; doi:10.3390/app7080784

Comparative Performance of Thermoacoustic Heat Exchangers with Different Pore Geometries in Oscillatory Flow. Implementation of Experimental Techniques

1
Department of Engineering, University of Messina, Contrada di Dio, 98166 S. Agata (Messina), Italy
2
Department of Architecture, University of Ferrara, Via della Ghiara 36, 44121 Ferrara, Italy
*
Author to whom correspondence should be addressed.
Received: 24 July 2017 / Revised: 31 July 2017 / Accepted: 31 July 2017 / Published: 2 August 2017
(This article belongs to the Special Issue Heat Transfer Processes in Oscillatory Flow Conditions)
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Abstract

Heat exchangers (HXs) constitute key components of thermoacoustic devices and play an important role in determining the overall engine performance. In oscillatory flow conditions, however, standard heat transfer correlations for steady flows cannot be directly applied to thermoacoustic HXs, for which reliable and univocal design criteria are still lacking. This work is concerned with the initial stage of a research aimed at studying the thermal performance of thermoacoustic HXs. The paper reports a detailed discussion of the design and fabrication of the experimental set-up, measurement methodology and test-HXs characterized by two different pore geometries, namely a circular pore geometry and a rectangular (i.e., straight fins) pore geometry. The test rig is constituted by a standing wave engine where the test HXs play the role of ambient HXs. The experiment is conceived to allow the variation of a range of testing conditions such as drive ratio, operation frequency, acoustic particle velocity, etc. The procedure for estimating the gas side heat transfer coefficient for the two involved geometries is described. Some preliminary experimental results concerning the HX with straight fins are also shown. The present research could help in achieving a deeper understanding of the heat transfer processes affecting HXs under oscillating flow regime and in developing design optimization procedures. View Full-Text
Keywords: thermoacoustics; heat exchangers; heat transfer; acoustic power thermoacoustics; heat exchangers; heat transfer; acoustic power
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Piccolo, A.; Siclari, R.; Rando, F.; Cannistraro, M. Comparative Performance of Thermoacoustic Heat Exchangers with Different Pore Geometries in Oscillatory Flow. Implementation of Experimental Techniques. Appl. Sci. 2017, 7, 784.

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