A numerical study on the vaporization of a droplet considering internal circulating flow in the presence of an oscillating flow

Title & Authors
A numerical study on the vaporization of a droplet considering internal circulating flow in the presence of an oscillating flow
Ha, Man-Yeong;

Abstract
The two-dimensional, unsteady, laminar conservation equations for mass, momentum, energy and species transport in the gas phase and mass, momentum and energy in the liquid phase are solved simultaneously in spherical coordinates in order to study heating and vaporization of a droplet entrained in the oscillating flow. The numerical solution gives the velocity and temperature distribution in both gas and liquid phase as a function of time. When the gas flow oscillates around an vaporizing droplet, the liquid flow circulates in the clockwise or counterclockwise direction and the temperature distribution in the liquid phase changes its shapes, depending on the gas fow direction. When the gas flow changes its direction of circulating liquid flow is opposite to the gas flow, forming two vortex circulating in the opposite direction. During the heating period, the difference in the maximum and minimum temperature is large, followed by the almost uniform temperature slightly below the boiling temperature. The mass and heat transfer from the droplet depend on the droplet temperature, droplet diameter and the magnitude of relative velocity, giving the droplet lifetime different from the d$\small{^{2}}$-law.
Keywords
Droplet Vaporization;Internally Circulating Flow;Oscillating Flow;Entrainment;Numerical Analysis;
Language
Korean
Cited by
References
1.
Prog. Energy Combust Sci., 1976. vol.2. pp.167-179

2.
Prog. Energy Combust Sci., 1983. vol.9. pp.1-76

3.
Prog. Energy Combust Sci., 1982. vol.8. pp.171-201

4.
Combustion and Flame, 1982. vol.44. pp.113-124

5.
Combustion and Flame, 1982. vol.44.

6.
Combustion and Flame, 1983. vol.52. pp.59-70

7.
Combustion and Flame, 1985. vol.59. pp.43-51

8.
In’l J. of Heat and mass Transfer, 1978. vol.21. pp.885-895

9.
21st Symposium (International) on Combustion, 1983. pp.609-616

10.
Combustion and Flame, 1988. vol.74. pp.111-120

11.
1989 Nat’l Heat Transfer Conference, HTD, 1989. vol.107. pp.131-140

12.
20th Symposium (International) on Combustion, 1984. pp.1743-1749

13.
Prog. Energy Combust Sci., 1989. vol.15. pp.131-158

14.
J. of Fluid Dynamics, 1992. vol.237. pp.671-687

15.
Combustion and Flame, 1993. vol.93. pp.287-302

16.
대한기계학회논문집, 1992. vol.15. 12, pp.2376-2384

17.
대한기계학회논문집, 1993. vol.17. 4, pp.1023-1028

18.
대한기계학회논문집, 1993. vol.17. 11, pp.2816-2829

19.
대한기계학회논문집, 1995. vol.19. 11, pp.2699-2709

20.
대한기계학회논문집, 1995. vol.19. 12, pp.3352-3359

21.
State of the Art and Research Needs of Pulsating Combustion, 1984.

22.
J. of Fluids Engineering, 1975. pp.321-326

23.
Acoustic Enhancement of Pulverized Coal Combustion, 1984.

24.
19th Symposium (International) on Combustion, 1982. pp.1197-1203

25.
Acoustically Enhanced Combustion of Micronized Coal Water Slurry Fuel, 1989.

26.
Combustion and Flame, 1991. vol.86. pp.33-46

27.
ASME J. of Energy Resources Technology, 1991. vol.113. pp.268-276

28.
ASME J. of Energy Resources Technology, 1991. vol.113. pp.277-285

29.
ASME J. of Energy Resources Technology, 1991. vol.113. pp.286-293

30.
International J. of Heat and Mass Transfer, 1993. vol.36. pp.2183-2192

31.
International J. of Heat and Mass Transfer, 1993. vol.36. 8, pp.2193-2202

32.
고강도 음향학장 하에서 단위액적 연소 효율 향상에 관한 연구, 1994.

33.
KSME Journal, 1995. vol.9. 2, pp.209-224

34.
Combustion and Flame, 1993. vol.92. pp.459-464

35.
Numerical Heat Transfer, 1984. vol.7. pp.147-163