The influence of quality, flow regime, heat flux, and mass flux on the electrohydrodynamic (EHD) enhancement of convective boiling of R-134a in a horizontal smooth tube was investigated in detail. The EHD forces generated significant enhancements in the heat transfer coefficient, but the enhancements were highly dependent on the quality, flow regime, heat flux, and mass flux. The experimental data provided evidence that an optimum EHD enhancement exists for a given set of these variables with a specific electrode design. However, experimental data also provided evidence that the EHD forces can drastically reduce the rate of heat transfer at certain conditions
Issue Section:
Heat Transfer Enhancement
1.
Salehi
, M.
, Ohadi
, M. M.
, and Dessiatoun
, S.
, 1995
, “EHD-Enhanced Convective Boiling of R-134a in Grooved Channels-Application to Compact Heat Exchangers
,” ASME J. Heat Transfer
, 119
, pp. 805
–809
.2.
Yabe
, A.
, Taketani
, T.
, Maki
, H.
, Takahshi
, K.
, and Nakadai
, Y.
, 1992
, “Experimental Study of Electrohydrodynamically Enhanced Evaporator for Nonazeotropic Mixtures
,” ASHRAE Trans.
, 98
, No. 2
, pp. 455
–461
.3.
Singh, A., Ohadi, M. M., Dessiatoun, S., and Salehi, M., 1995, “In-tube Boiling Enhancement of R-134a Utilizing the Electric Field Effect,” ASME/JSME Thermal Engineering Joint Conference, Maui, Hawaii, Vol. 2, pp. 215–223.
4.
Norris, C., Cotton, J. S., Shoukri, M., Smith-Pollard, T., and Chang, J. S., 1997, “Inlet Quality Effects on Horizontal Convective Boiling Under the Electrohydrodynamic (EHD) Effect,” Proceedings of ESA-IEJ Joint Symposium on Electrostatics, Vol. 2, pp. 76–94.
5.
Bryan, J. E., and Seyed-Yagoobi, J., 2000, “Electrohydrodynamically Enhanced Convective Boiling: Relationship between Electrohydrodynamic Pressure and Momentum Flux,” ASME J. Heat Transfer (in press).
6.
Melcher, J. R., 1981, Continuum Electromechanics, MIT Press, Cambridge, Massachusetts.
7.
Seyed-Yagoobi
, J.
, and Bryan
, J. E.
, 1999
, “Enhancement of Heat Transfer and Mass Transport in Single-phase and Two-phase Flows with Electrohydrodynamics
,” Adv. Heat Transfer
, 33
, pp. 95
–186
, Academic Press.8.
Jones
, T. B.
, 1977
, “Bubble Dielectrophoresis
,” J. Appl. Phys.
, 48
, No. 4
, pp. 1412
–1417
.9.
Bryan, J. E., 1998, “Fundamental Study of Electrohydrodynamically Enhanced Convective and Nucleate Boiling Heat Transfer,” Ph.D. Dissertation, Texas A&M University, College Station.
10.
Kline
, S. J.
, and McClintock
, F. A.
, 1953
, “Describing Uncertainties in Single Sample Experiments
,” Mech. Eng. (Am. Soc. Mech. Eng.)
, 75
, pp. 3
–8
.11.
Taylor, J. R., 1982, An Introduction to Error Analysis, University Science Books, Mill Valley, California.
12.
Wattelet
, J. P.
, Chato
, J. C.
, Souza
, A. L.
, and Christoffersen
, B. R.
, 1994
, “Evaporative Characteristics of R-12, R-134a, and a Mixture at Low Mass Fluxes
,” ASHRAE Trans.
, 100
, No. 1
, pp. 603
–615
.13.
Kandlikar
, S. G.
, 1990
, “A General Correlation for Saturated Two-Phase Flow Boiling Heat Transfer Inside Horizontal and Vertical Tubes
,” ASME J. Heat Transfer
, 112
, pp. 219
–228
.14.
Wattelet, J. P., 1994, “Heat Transfer Flow Regimes of Refrigerants in a Horizontal-Tube Evaporator,” Ph.D. Dissertation, University of Illinois, Urbana-Champaign, Illinois.
15.
Taitel
, Y.
, and Dukler
, A. E.
, 1976
, “A Model for Predicting Flow Regime Transitions in Horizontal and Near Horizontal Gas-liquid Flow
,” AIChE J.
, 22
, pp. 47
–55
.16.
Seyed-Yagoobi
, J.
, Geppert
, C. A.
, and Geppert
, L. M.
, 1996
, “Electrohydrodynamically Enhanced Heat Transfer in Pool Boiling
,” ASME J. Heat Transfer
, 118
, pp. 233
–237
.17.
Geppert, C. A., 1994, “Electrohydrodynamically Enhanced Heat Transfer in Pool Boiling,” Technical Report, Department of Mechanical Engineering, Texas A&M University, College Station, Texas.
18.
Ogata
, J.
, and Yabe
, A.
, 1993
, “Augmentation of Boiling Heat Transfer by Utilizing the EHD Effect-EHD Behavior of Boiling Bubbles and Heat Transfer Characteristics
,” Int. J. Heat Mass Transf.
, 36
, No. 3
, pp. 783
–791
.19.
Singh
, A.
, Ohadi
, M. M.
, Dessiatoun
, S.
, and Chu
, W.
, 1994
, “In-tube Boiling Enhancement of R-123 Using the EHD Technique
,” ASHRAE Trans.
, 100
, No. 2
, pp. 818
–825
.20.
Singh, A., 1995, “Electrohydrodynamic (EHD) Enhancement of In-Tube Boiling and Condensation of Alternative (Non-CFC) Refrigerants,” Ph.D. Dissertation, University of Maryland, College Park.
21.
Salehi
, M.
, Ohadi
, M. M.
, and Dessiatoun
, S.
, 1996
, “The Applicability of the EHD Technique for Convective Boiling of Refrigerant Blends—Experiments with R-404A
,” ASHRAE Trans.
, 102
, No. 1
, pp. 839
–844
.Copyright © 2001
by ASME
You do not currently have access to this content.
