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Journal of Enhanced Heat Transfer
Facteur d'impact: 0.562 Facteur d'impact sur 5 ans: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v7.i6.30
pages 385-409

"On-demand" Electrohydrodynamic (EHD) Heat Transfer Enhancement Using an Anionic Surfactant

J. S. Paschkewitz
Mechanical and Thermal Systems Branch, Air Force Research Laboratory, Wright-Patterson AFB, Ohio, USA
M. A. Smajdek
Mechanical and Thermal Systems Branch, Air Force Research Laboratory, Wright-Patterson AFB, OH
David M. Pratt
Thermal Structures Branch, Air Vehicles Directorate, Air Force Research Laboratory, Wright Patterson Air Force Base, OH 45433, USA

RÉSUMÉ

Transient heat transfer enhancement performance with electrohydrodynamic (EHD) augmentation was characterized using a single-phase transformer oil in a concentric wire-cylinder test section. Performance using the oil alone was inconsistent, but the addition of an anionic surfactant gave reproducible enhancements with rapid response times. The impact of surfactant concentration on enhancement behavior was investigated in both the transient and steady state regimes. For both high and low concentrations of surfactant additive, current response to step voltage changes occurred within 300 msec, and enhancement response lagged due to the thermal mass of the test article. In the steady state, the high concentration of the additive resulted in a much higher electrical power requirement but gave better enhancement and pressure drop behavior for a given enhancement than the low concentration. Mechanisms for the positive effect of the surfactant additive are analyzed and electrochemical rate constants are obtained. Implications for the design of controllable EHD-enhanced heat transfer systems are articulated.


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