No coin nor oath required. For personal study only.
Yhermoacoustic oscillations are well known in cryogenics; in most cases they occur spontaneously and are undesired. Much work has been done to calculate this effect; with the final breakthrough achieved by Rott. In part 1 of this paper, we present an extension to Rott's theory, which allows its application to more complicated geometries. Frequency, pressure amplitudes, power and heat flow can be determined with a moderate amount of computer calculations. Experimental verification has been made for a thermoacoustic heat engine, and good agreement has been found. Based on this theory and on experience with the experimental set-up, possible applications ~f thermoacoustic oscillations as heat engines and as refrigerators will be discussed in part 2 of this paper. In part 3, guidelines for the correct design of cryogenic piping and of different dampers are given.'
The papers provide a clear and comprehensive investigation of a phenomenon of real relevance to cryogenics with good ideas for practical applications. The Award Committee felt that the quality of the presentation and originality of the work carried out made this group of papers the most outstanding non-superconductivity papers to be published in Cryogenics in 1992. The authors are to be congratulated.
The presentation of the Award will take place at the Awards Luncheon to be held during CEC/ICMC 1993 in Albuquerque, NM, USA. * This is an annual prize awarded to the authors of a paper published in the previous year's volume of Cryogenics which the Award Committee feels to be the best in terms of originality, practicality and clarity of presentation. The Award itself consists of a certificate and a free one-year subscription to Cryogenics for each author and a joint prize of ยฃ500.
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