Experimental study of heat transfer characteristics of finned-tube and circular-pore heat exchangers in oscillatory flow

Antonio Piccolo, Artur J. Jaworski

Research output: Contribution to journalArticle

Abstract

This work is concerned with an experimental investigation of the thermal performance of two thermoacoustic heat exchangers characterized by different pore geometries, namely a circular-pore geometry and a finned-tube geometry. A standing wave engine, where the heat exchangers under test play the role of ambient HXs, is used as test-rig. Heat transfer rates measurements by standard energy balance techniques and dynamic pressure measurements are used to assess the impact of the two heat exchangers on the engine performance. The gas-side heat transfer coefficient, expressed as Nusselt number, is also determined for the finned-tube heat exchanger. The resulting values are compared to the heat transfer coefficients estimated in analogous experimental studies and by predictive models. Results show that the circular-pore heat exchanger reduces the performance of the engine compared to the finned-tube heat exchanger by about 23%, being affected by higher thermal and viscous irreversibility. Moreover, the boundary layer conduction model exhibits a better agreement with the measured heat transfer coefficients compared to other models. A new correlation law, based on regression of the experimental data, is also derived.
Original languageEnglish
Article number116022
Number of pages10
JournalApplied Thermal Engineering
Volume181
Early online date10 Sep 2020
DOIs
Publication statusE-pub ahead of print - 10 Sep 2020

Fingerprint Dive into the research topics of 'Experimental study of heat transfer characteristics of finned-tube and circular-pore heat exchangers in oscillatory flow'. Together they form a unique fingerprint.

Cite this