In an experimental investigation of electrohydrodynamic two-phase flow, the application of a 60 Hz AC voltage potential to convective boiling and condensation systems has led to a regime unique to any flow pattern previously observed 1,2,3. It is an oscillatory flow, where droplets as large as 2 mm in diameter are entrained in a vapor core that is surrounded by an annular liquid film around the circumference of the tube and electrode, resembling a multi-layered annular flow. The droplets oscillate radially in the lower portion of the annulus at a frequency of approximately 120 Hz, twice the frequency of the applied field, occasionally being entrained by the inner or outer annular film. In addition to the droplet formation, small spouts or jets of liquid were observed on the upper half of the annular film surrounding the electrode. These spouts seemed...

1.
Cotton, J. S., 2000, “Mechanisms of Electrohydrodynamic (EHD) Flow and Heat Transfer in Horizontal Convective Boiling Channels,” Ph.D. thesis, McMaster University, Hamilton, Ont., Canada.
2.
Cotton, J. S., Chang, J. S., and Shoukri, M., 2001, “Numerical Simulation of Electric Field Distributions in Electrohydrodynamic Two-Phase Flow Regimes,” IEEE/DEIS Transactions on Dielectric and Electrical Insulation, submitted for review.
3.
Cotton, J. S., Chang, J. S., and Shoukri, M., 2001, “Mechanisms of AC Electrohydrodynamic Flow and Convective Boiling Heat Transfer in Horizontal Annular Channels,” ASME J. of Heat Transfer, to be submitted.
4.
Cotton, J. S., Shoukri, M. M., Chang, J. S., and Smith-Pollard, T., 2000, “Electrohydrodynamic (EHD) Flow and Convective Boiling Augmentation in Single-Component Horizontal Annular Channels,” Proceedings of the ASME Heat Transfer Division, Heat Transfer Enhancement of Multi-Phase Flow, HTD-366, pp. 177–184.
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