표면 거칠기에 따른 액적의 증발 냉각

Evaporation Cooling of Droplet due to Surface Roughness

  • 발행 : 2003.09.01

초록

The objective of the present work is to examine evaporation cooling of droplet due to surface roughness on a heated surface. The surface temperatures varied from 80-$160^{\circ}C$ on aluminum alloy (AL 2024) md surface roughness was 0.l8$\mu\textrm{m}$ 1.36$\mu\textrm{m}$. The results are as follows; Regardless of surface roughness, as droplet diameter is bigger, the in-depth temperature of solid decreases and evaporation time increases. In the case of same initial temperature on the heated surface, as droplet diameter is smaller and small surface roughness is bigger, evaporation time decreases and time averaged heat flux increases.

키워드

참고문헌

  1. Bonacina, C., DelGiudice, S., Comini, G., 'Dropwise Evaporation', J. of Heat Transfer, Vol. 101, pp. 441-446, 1979 https://doi.org/10.1115/1.3451004
  2. Rizza, J., 'A Numerical Solution to Dropwise Evaporation', J of Heat Transfer, Vol. 103, pp. 501-507, 1981 https://doi.org/10.1115/1.3244492
  3. Seki, M., Kawamura, H., Sanokawa, K., 'Transient Temperature Profile of a Hot Wall due to an Impinging Liquid Droplet', Trans. Am. Soc. Mech. Engrs, Series C, J. of Heat Transfer, Vol. 100, pp. 167-169, 1978 https://doi.org/10.1115/1.3450494
  4. Michiyoshi, I., Makmo, K., 'Heat Transfer Characteristics of Evaporation of a Liquid Droplet on the Heated Surfaces', Int. J. of Heat Mass Tnmsfer, Vol. 21. pp. 605-613, 1978 https://doi.org/10.1016/0017-9310(78)90057-1
  5. Makrno, K., Michiyoshi, I., 'Discussions of Transient Heat Transfer to a Water Droplet on Heated Surfaces under Atmospheric Pressure', Int. J. of Heat Mass Transfer, Vol. 30. No. 9, pp. 1895-1905, 1989
  6. DiMarzo, M., Evans, D. D., 'Evaporation of a Water Droplet Deposited on a Hot High Thermal Conductivity Surface', J. of Heat Transfer, Vol. 111, pp. 210-213, 1989 https://doi.org/10.1115/1.3250652
  7. 방창훈, 양창호, '액적의 Weber 수에 따른 냉각 특성의 변화', 산업안전학회지, 제18권, 제1호, pp. 33-37, 2002
  8. Cengel Y. A., Boles M. A., Thermodynamics, McGraw-Hill, Int. ed, 1994