A study on the deformation of a bubble and a drop in a uniform electric field

- Journal title : Transactions of the Korean Society of Mechanical Engineers B
- Volume 20, Issue 6, 1996, pp.2023-2035
- Publisher : The Korean Society of Mechanical Engineers
- DOI : 10.22634/KSME-B.1996.20.6.2023

Title & Authors

A study on the deformation of a bubble and a drop in a uniform electric field

Gwon, Yeong-Cheol; Kim, Mu-Hwan; Gang, In-Seok; Cho, Hae-Jung; Kim, Suk-Joon;

Gwon, Yeong-Cheol; Kim, Mu-Hwan; Gang, In-Seok; Cho, Hae-Jung; Kim, Suk-Joon;

Abstract

In the present study, the characteristics of the electrical deformation of a bubble and a drop under a uniform electric field have been investigated to understand EHD heat transfer enhancement by an electric field. The deformation of the bubble and the drop have been studied theoretically using an electric normal stress acting on their interfaces and assured by the numerical analysis and the experiment. From the variation of bubble volume and free energy, it is found that a bubble is compressed in an electric field and free energy had larger value with increasing W and the permittivity of a dielectric fluid. The electric normal stress induced on the interface of the bubble and the drop is different. Because of the surface charge induced at the drop interface, the electric normal stress acting on the drop is much larger than that of the bubble. The drop is, therefore, deformed much more than the bubble. In addition, the experimental and numerical results show that the aspect ratio and the contact angle of the bubble increase with increasing W.

Keywords

electrohydrodynamics;Bubble;Drop;Uniform;Electric Field;Deformation;

Language

Korean

Cited by

References

1.

Advances in Heat Transfer, 1978.
vol.14.
pp.107-148

2.

Int. J. Heat Mass Transfer, 1993.
vol.36(3).
pp.775-782

3.

Heat Transfer Science and Technology, 1987.
pp.812-819

4.

Int. J. Heat Mass Transfer, 1981.
vol.24.
pp.811-819

5.

Proc. Roy. Soc., 1964.
pp.211-226

6.

Ann. Rev. Mech., 1969.
vol.1.
pp.111-146

7.

Phys. Fluids, 1981.
vol.24(11).
pp.1967-1972

8.

Int. J. Heat and Mass Flow, 1986.
vol.7.
pp.278-282

9.

Int. J. Heat Mass Transfer, 1993.
vol.36(3).
pp.775-782

10.

J. Fluid Mech, 1992.
vol.235.
pp.481-510

11.

Pro. 3rd JSME-KSME Fluids Engineering Conf., 1994.
pp.33-38

12.

대한기계학회논문집, 1995.
vol.19. 6,
pp.1518-1528

13.

proceedings of the 2nd International Conf. on Multiphase Flow, 1995.
vol.4.
pp.FC1-7

14.

Electromagnetic Theory, 1941.

15.

Proc. Phys. Soc., 1962.
vol.80.
pp.190-198

16.

Static and Dynamic Electricity, 1950.

17.

Electrodynamics of Continuous Media : Course of Theoretical Physics Volume 8, 1960.
vol.8.

18.

Foundations of Electromagnetic Theory, 1964.

19.

Int. J. Heat and Fluid Flow, 1986.
vol.7(4).
pp.278-282

20.

J. Fluid Mech., 1984.
vol.148.
pp.1-17

21.

IEEE Transactions on Power Apparatus and System., 1985.
vol.PAS-104(2).
pp.489-495

22.

proceedings of the 2nd International Conf. on Multiphase Flow, 1995.
vol.4.
pp.FCI-7