DOI QR코드

DOI QR Code

The Effect of Nozzle Diameter on Heat Transfer to a Fully Developed Round Impinging Jet

완전 발달된 원형 충돌제트의 노즐 직경이 열전달에 미치는 영향

  • 이대희 (인제대학교 기계자동차공학부) ;
  • 원세열 (인제대학교 대학원 기계공학과) ;
  • 이영민 (인제대학교 대학원 기계공학과) ;
  • 조헌노 (인제대학교 대학원 기계공학과)
  • Published : 2000.04.01

Abstract

The effect of nozzle diameter on the local Nusselt number distributions has been investigated for an axisymmetric turbulent jet impinging on the flat plate surface. The flow at the nozzle exit has a fully developed velocity profile. A uniform heat flux boundary condition at the plate surface was created using gold film Intrex. Liquid Crystal was used to measure the plate surface temperature. The experiments were made for the jet Reynolds number (Re) 23,000, the dimensionless nozzle to surface distance (L/d) from 2 to 14, and the nozzle diameter (d) from 1.36 to 3.40 cm. The results show that the Nusselt number at and near the stagnation point increase with an increasing value of the nozzle diameter.

Keywords

References

  1. Martin. H., 1977, 'Heat and Mass Transfer between Impinging Gas Jets and Solid Surfaces,'Advances in Heat Transfer, Academic Press, New York, Vol. 13, pp. 1-60
  2. Down, S. J., and James, E. H., 1987, 'Jet Impinging Heat Transfer-A Literature Survey,' ASME paper No. 87-H-35
  3. Goldstein, R. J., Behbahani, A. I., and Heppelmann, K. K. 1986, 'Streamwise Distribution of the Recovery Factor and The Local Heat Transfer Coefficient to an Impinging Circular Air Jet,' Int. J. Heat Mass Transfer, Vol. 29, No. 8, pp. 1227-1235 https://doi.org/10.1016/0017-9310(86)90155-9
  4. Viskanta, R., 1993, 'Heat Transfer to Impinging Isothermal Gas and Frame Jet,'Experimental Thermal and Fluid Science, Vol. 6, pp. 111 -134 https://doi.org/10.1016/0894-1777(93)90022-B
  5. Hoogendoom, C. J., 1977, 'The Effect of Turbulence on Heat Transfer at Stagnation Point,' International Journal of Heat and Mass Transfer, Vol. 20, pp. 1333-1338
  6. Lee, D. H., and Grief, R., Lee, S. J., and Lee, J. H., 1995, 'Heat Transfer from a Surface to a Fully Developed Axisymmetric Impinging Jet,' ASME Journal of Heat Transfer, Vol. 117, pp. 772-776
  7. Yan, X., 1993, 'A Preheated-Wall Transient Method Using Liquid Crystals for the Measurement of Heat Transfer on External Surfaces and in Ducts,' Ph.D. Dissertation, University of California, Davis
  8. Goldstein, R. J., and Franchett, M. E., 1988, 'Heat Transfer From a Flat Surface to an Oblique Impinging jet,' ASME Journal of Heat Transfer, Vol. 110, pp. 84-90
  9. Chung, Y, S, Lee, D. H., Lee, J. S., 1999, 'Heat Transfer Characteristics of an Axisymmetric Jet Impinging on The Rib-Roughened Convex Surface,' International Journal of Heat and Mass Transfer, Vol. 42, pp. 2102 -2110 https://doi.org/10.1016/S0017-9310(98)00313-5
  10. Lee, D. H., Chung, Y. S., and Kim M. G., 1999, 'Turbulent Heat Transfer from a Convex Hemispherical Surface to a Round Impinging Jet,' International Journal of Heat and Mass Transfer, Vol. 42, pp. 1147-1156 https://doi.org/10.1016/S0017-9310(98)00174-4
  11. Lee, D. H., Chung, Y. S., Won, S. Y., 1999, 'The Effect of Concave Surface Curvature on Heat Transfer from a Fully Developed Round Impinging Jet,' International Journal of Heat and Mass Transfer, Vol. 42, pp. 2489-2497 https://doi.org/10.1016/S0017-9310(98)00318-4
  12. 정영석, 이대희, 이준식, 1998, '표면조도를 가지는 볼록한 면에 충돌하는 제트에 의한 열전달 계수 측정,' 대한기계학회논문집, 제22권, 제3호, pp. 373-385
  13. 이대희, 원세열, 이준식, 1999 '표면조도를 가지는 오목한 면에 충돌하는 원형제트에 의한 열전달 측정,' 대한기계학회논문집, 제23권 제6호, pp 734-743
  14. Lee, D. H., Chung, Y. S., and Kim, D. S., 1997, 'Turbulent Flow and Heat Transfer Measurements on a Curved Surface with a Fully Developed Round Impinging Jet,' International Journal of Heat and Fluid Flow, Vol. 18, No.1, pp. 160-169 https://doi.org/10.1016/S0142-727X(96)00136-1
  15. Kline, S. J., and McKlintock, F. A., 1953, 'Describing Uncertainties in Single Sample Experiments,' Mechanical Engineering, Vol. 75, pp. 3-8
  16. Giralt, F., Chia, C., and Trass, O., 1977, 'Characterization of the Impingement Region in and Axisymmetric Turbulent Jet,' Industrial and Engineering Chemistry Fundamentals, Vol. 16, pp. 21-28 https://doi.org/10.1021/i160061a007
  17. 양근영, 최만수, 이준식, 1997, '평판제트 충돌냉각에서 슬롯제트 폭의 변화에 따른 제트 유동장 및 열전달 특성에 관한 연구,' 대한기계학회 1997년도 춘계학술대회논문집(B), pp 619-624
  18. Gau, C. and Chung, C. M., 1991, 'Surface Curvature Effect on Slot-Air Jet Impingement Cooling Flow and Heat Transfer Process,' ASME Journal of Heat Transfer, Vol. 113, pp, 857-864
  19. Kataoka, K., Sahara, R., Ase, H. and Harada, R., 1987, 'Role of Large Scale Coherent Structures in Impinging Jet Heat Transfer,' Journal of Chemical Engineering-Japan, Vol. 20, pp. 71-76