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Experimental and Theoretical Temperature Gradient Coefficient in Thermoacoustics

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The temperature gradient coefficient of a cotton wool stack is investigated at a nonzero temperature gradient. The direct measurement method of the temperature gradient coefficient is proposed and its experimental results are compared with theoretical calculations. Parallel, capillary-tube-based thermoacoustic theory for random porous media is applied for theoretical calculations. Comparison results show reasonable agreement in the temperature gradient coefficient, which is useful to determine the performance of thermoacoustic devices. These results lead to convincing the validation scheme of both the measurement methods and theoretical calculations.
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Document Type: Short Communication

Publication date: 01 July 2008

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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