EHD-enhanced boiling coefficients and visualization of R-134a over enhanced tubes
- Univ. of Maryland, College Park, MD (United States)
In an earlier study by the authors, the applicability of the EHD technique for augmentation of pool boiling heat transfer of R-134a in a tube bundle was demonstrated. This paper reports additional experiments involving optimization of the electrode/heat transfer surface geometry as well as flow visualization studies that provide improved understanding of the EHD-enhanced pool boiling heat transfer in a tube bundle. Two electrode geometries were tested, a circular wire mesh and a rectangular wire mesh. Experiments were conducted as a function of parametric values of heat flux and applied electric field potential with R-134a as the working fluid. Utilizing the flow visualization studies, it is demonstrated that combined electro-convection and changes in the nucleate boiling dynamics give rise to the improved heat transfer coefficients.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- OSTI ID:
- 455383
- Report Number(s):
- CONF-951135--; ISBN 0-7918-1754-7
- Country of Publication:
- United States
- Language:
- English
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