배열충돌제트에서 횡방향유동성분에 따른 열/물질전달 특성 고찰

DOI QR코드

DOI QR Code

윤필현;이동호;조형희
Yoon, Pil-Hyun;Rhee, Dong-Ho;Cho, Hyung-Hee

  • 발행 : 2000.02.01

초록

The local heat/mass transfer coefficients for arrays of impinging circular air jets on a plane surface are determined by means of the naphthalene sublimation method. Fluid from the spent jets is constrained to flow out of the system in one direction. Therefore, the spent fluid makes a crossflow in the confined space. The present study investigates effects of jet-orifice-plate to impingement-surface spacing and jet Reynolds number. The spanwise- and overall-averaged heat/mass transfer coefficients are obtained by numerical integrating the local heat transfer coefficients. The local maximum heat/mass transfer coefficients move further in the downstream direction due to the increase of crossflow velocity. At the mid-way between adjacent jets, the heat/mass transfer coefficients have a small peak owing to the collision of the adjacent wall jets and are affected strongly by the crossflow. The effect of the crossflow occurs strongly at the small orifice-to-impingement surface distance.

키워드

열/물질전달;배열제트;충돌;횡방향유동;나프탈렌 승화법

참고문헌

  1. Koopman, R. N. and Sparrow, E. M., 1975, 'Local and Average Transfer Coefficients due to an Impinging Row of Jets,' Int. J. Heat and Mass Transfer, Vol. 8, pp. 1261-1272 https://doi.org/10.1016/0017-9310(76)90051-X
  2. Behbahani, A. I. and Goldstein, R. J., 1983, 'Local Heat Transfer to Staggered Arrays of Impinging Circular Air Jets,' J. of Engineering for Power, Vol. 105, pp. 354-360
  3. Ambrose, D., Lawrenson, I. J. and Sprake, C. H. S., 1975, 'The Vapour Pressure of Naphthalene,' J. Chem. Thermodynamics, Vol. 7, pp. 1173-1176 https://doi.org/10.1016/0021-9614(75)90038-5
  4. Goldstein, R. J. and Cho, H. H. 1995, 'A Review of Mass Transfer Measurements Using Naphthalene Sublimation,' Experimental Thermal and Fluid Science, Vol. 10, pp. 416-434 https://doi.org/10.1016/0894-1777(94)00071-F
  5. Kline, S. J. and McClinetock, F., 1953, 'Describing Uncertainty in Single Sample Experiments,' Mech Engineering, Vol. 75, pp.3-8
  6. Martin, H., 1977, 'Heat and Mass Transfer between Impinging Gas Jets and Solid Surfaces,' Adv. Heat and Mass Transfer, Vol. 13, pp. 1-60
  7. Gardon, R. and Akfirat, J. C., 1966, 'Heat Transfer Characteristics of Impinging Two-Dimensional Air Jets,' J. Heat Transfer, pp. 101-108
  8. Gardon, R and Akfirat, J. C., 1965, 'The Role of Turbulence in Determining the Heat Transfer Characteristics of Impinging Jets,' Int. J. Heat Mass Transfer, Vol. 8, pp. 1261-1271 https://doi.org/10.1016/0017-9310(65)90054-2
  9. Behbahani, A. I., 1979, 'Heat Transfer to Staggered Arrays of Impinging Circular Air Jets,' Ph.D. Thesis, University of Minnesota
  10. Huber, A. M. and Viskanta, R., 1994, 'Effect of Jet-Jet Spacing on Convective Heat Transfer to Confined Impinging Arrays of Axisymmetric Air Jets,' Int. J. Heat Mass Transfer, Vol. 37, No. 18, pp. 2859-2869 https://doi.org/10.1016/0017-9310(94)90340-9
  11. Obot, N. T. and Trabold, T. A., 1987, 'Impingement Heat Transfer Within Arrays of Circular Jets: Part 1-Effects of Minimum, Intermediate, and Complete Crossflow for Small and Large Spacings,' J. Heat Transfer, Vol. 109, pp. 872-879
  12. Metzger, D. E. and Korstad, R. J., 1972, 'Effects of Crossflow on Impingement Heat Transfer,' J. Engineering for Power, pp. 35-42
  13. Hollworth, B. R. and Berry R. D., 1978, 'Heat Transfer From Arrays of Impinging Jets with Large Jet-to-Jet Spacing,' J. Heat transfer, Vol. 100, pp. 352-357