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Path: Home » Indice Pubblicazioni » Convegni ATI - Accesso riservato soci CTI » CA - 66 - Rende 2011 » IMPACT OF HEAT EXCHANGER FIN LENGTH A...

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IMPACT OF HEAT EXCHANGER FIN LENGTH AND SPACING ON THE COOLING POWER OF STANDING WAVE THERMOACOUSTIC REFRIGERATORS

Pubblicazione


Autore: A. Piccolo, L. Ponterio, L. La Face

Collana: CA - 66 - Rende 2011

Note:
A critical issue for the development of efficient thermoacoustic systems is the design of appropriate heat exchangers which have to sustain high transfer rates in conjunction to low acoustic dissipation. Addressing this task for oscillatory fluid flows entails a series of new challenges compared to traditional compact heat exchangers working in steady and unidirectional fluid flows. The most relevant issue is the choice of the optimal fin length along the direction of the particle acoustic oscillation for which suitable design criteria are still lacking. In this paper the results of a 2D numerical model for the study of the thermal performance of thermoacoustic heat exchangers in a simplified configuration are presented. The simulation model system consists of a stack of parallel plates sandwiched between two heat exchangers and located in a half-wavelength gas filled
resonator sustaining a standing wave. The model integrates the energy transport variables of the classical linear thermoacoustic theory in an energy balance-based numerical calculus scheme. The model is validated by comparing numerical predictions
against experimental data found in literature. The effect of operating conditions and geometrical parameters on the heat transfer characteristics are investigated. Information on the optimal settings which maximize the heat exchangers performance is derived. The main result found here is that the fin length along the axial direction of particle oscillation can be chosen considerably lower than the peak-to-peak displacement amplitude without compromising the heat exchanger performance and with great benefits in terms of viscous losses reduction.


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