Evaluation of random stack materials for use in thermoacoustic refrigerators

Xiaoan Mao, Patcharin Saechan, Artur J. Jaworski

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)


In a thermoacoustic refrigerator, energy conversion between thermal and acoustic power is achieved by means of an oscillatory motion of a compressible fluid along a solid body referred to as "stack". Traditionally, stacks have been most often made by arranging large number of thin plates at equal spacing to fill out the cross section of a thermoacoustic resonator. Other geometries such as circular pores, square or hexagonal pores (honeycombs) or pin-arrays can also be considered. Most common irregular geometry includes layers of woven wire mesh stacked along the resonator length. The advantages of thermoacoustic engines over other conventional energy conversion devices lie in their relatively simple hardware assembly, without the need for any dynamic sealing and lubrication. However, the fabrication of stacks, for example made out of very thin parallel plates, is usually costly and impractical, while using pre-fabricated stacks (e.g. ceramic catalytic converter substrates or honeycomb used in aerospace industry) has high materials costs, which limits the cost advantages of thermoacoustic engines. However, many of these problems could be avoided if irregular stack geometries made out of random (very often waste) materials could be used. There is a wide range of such candidate materials, including glass or steel wool, ceramic chippings, waste material from metal machining (swarf, Scourers), beds of glass or metal balls etc. However the main difficulty is the lack of experimental data characterising the performance of such stacks at the design stage. In this paper, the performance of a standing wave thermoacoustic refrigerator with a stack made of a few chosen random materials, is measured and compared to the one with a parallel plate stack. It is hoped that this work will be beneficial for developing low-cost thermoacoustic prime movers and heat pumps.

Original languageEnglish
Title of host publicationASME 2010 10th Biennial Conference on Engineering Systems Design and Analysis, ESDA2010
Number of pages6
Publication statusPublished - 1 Dec 2010
Externally publishedYes
EventAmerican Society of Mechanical Engineers10th Biennial Conference on Engineering Systems Design and Analysis - Istanbul, Turkey
Duration: 12 Jul 201014 Jul 2010


ConferenceAmerican Society of Mechanical Engineers10th Biennial Conference on Engineering Systems Design and Analysis
Abbreviated titleASME / ESDA


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