A study on the competing effects of the dielectrophoretic force and buoyancy on nucleate boiling heat transfer rates and an analogy with variable gravity boiling results
- Tektronix Inc., Wilsonville, OR (United States). Color Printing and Imaging Div.
- Washington State Univ., Pullman, WA (United States)
The purpose of this paper is to form a more general understanding of the effect an electric field has on boiling heat transfer by considering non-boiling electroconvection and boiling bubble dynamics separately. In an attempt to decouple these two heat transfer mechanisms, an electric field was utilized which produced a uniform dielectrophoretic force (DEP force) across a horizontal platinum wire. It was concluded that the effect of the DEP force on the bubbles is analogous to reducing or increasing the gravity locally or inducing vapor flow across the heater surface similar to forced-convection. In terms of the relationship between the bubble dynamics and the heat transfer, it was concluded that nucleate boiling heat transfer will be enhanced if the effective gravity acts to hold the vapor bubbles near the heater surface, while at the same time permitting access of the liquid to the surface in order to prevent dryout. However, a large electroconvective effect can dominate and possibly reverse this trend. For the critical heat flux (CHF) it was discovered that for 1
- OSTI ID:
- 477351
- Report Number(s):
- CONF-961105-; ISBN 0-7918-1519-6; TRN: IM9724%%228
- Resource Relation:
- Conference: 1996 international mechanical engineering congress and exhibition, Atlanta, GA (United States), 17-22 Nov 1996; Other Information: PBD: 1996; Related Information: Is Part Of ASME Heat Transfer Division: Proceedings. Volume 1: Heat transfer in microgravity systems, radiative heat transfer and radiative heat transfer in low-temperature environments, and thermal contact conductance and inverse problems in heat transfer; HTD-Volume 332; Gopinath, A. [ed.] [Naval Postgraduate School, Monterey, CA (United States)]; Sadhal, S.S. [ed.] [Univ. of Southern California, Los Angeles, CA (United States)]; Jones, P.D. [ed.] [Auburn Univ., AL (United States)]; Seyed-Yagoobi, J. [ed.] [Texas A and M Univ., College Station, TX (United States)]; Woodbury, K.A. [ed.] [Univ. of Alabama, Tuscaloosa, AL (United States)]; PB: 281 p.
- Country of Publication:
- United States
- Language:
- English
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