설비공학논문집 (Korean Journal of Air-Conditioning and Refrigeration Engineering)

  • 제12권1호
  • /
  • Pages.50-58
  • /
  • 2000
  • /
  • 1229-6422(pISSN)
  • /
  • 2465-7611(eISSN)
대한설비공학회 (The Society of Air-Conditioning and Refrigerating Engineers of Korea)
권호 표지

1열 원형 충돌수분류군에 의한 열전달의 실험적 연구 (제1보, 노즐형상의 영향)

Impingement heat transfer within 1 row of circular water jets : Part 1-Effects of nozzle configuration

  • 엄기찬 (인하공업전문대학 기계설계과) ;
  • 김상필 (동양공업전문대학 공장자동화과)
  • 발행 : 2000.01.01
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초록

Experiments were carried out to obtain the effects of nozzle configuration and jet to jet spacing on the heat transfer characteristics of single line of circular water jets impinging on a constant heat flux plane surface. The nozzle configurations are Cone type, Reverse cone type and Vertical circular type, and the nozzle arrays are single jet(nozzle dia. 8 mm), 1 row of 3 jets and 1 row of 5 jets. Jet velocities ranging from 3m/s to 8m/s were investigated for the nozzle to target plate spacing of 80 mm. For the Cone and Reverse cone type nozzle arrays, the average Nusselt number of 1 row of 5 jets was larger than that of 1 row of 3 jets at Re$_{D}$<45000, but that of 1 row of 3 jets was larger than that of 1 row of 5 jets at $Reo\le45000$. For the Vertical circular type nozzle, however, the average Nusselt number of 1 row of 3 jets was larger than that of 1 row of 5 jets at all jet velocities. In the condition of fixed mass flow rates, the maximum heat transfer augmentation was obtained for 1 row of 5 jets and was over 2 times larger than that of the single jet for all nozzle configurations. The nozzle configurations that produce the maximum average Nusselt number are as follows: For 1 row of 3 jets, the Vertical circular type at $Reo\le45000$ and the Reverse cone type at $Reo\le45000$. But, they are the Reverse cone type at Re$_{D}$<55000 and the Vertical circular type at$Reo\le55000$ for 1 row of 5 jets.

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참고문헌

  1. 대한기계학회 논문집(B) v.21 no.9 단일수분류 및 수분류군에 의한 열전달(2)-1열 수분류군- 엄기찬;이종수;금성민
  2. ASME J. Heat Transfer v.116 Correlating equations for impingement cooling of small heat sources with multiple circular liquid jets Womac, D. J.;Incropera, F. P;Ramadhyani, S.
  3. ASME J. Heat Transfer v.117 Heat transfer characteristics of arrays of free-surface liquid jets Pan, Y.;Webb, B. W.
  4. ASME J. Heat Transfer v.109 Impingement heat transfer within arrays of circular jets: Part. 1-Effects of minimum, intermediate, and complete crossflow for small and large spacings Obot, N. T.;Trabold, T. A.
  5. ASME J. Heat Transfer v.105 Local heat transfer to staggered arrays of impinging circular air jets Behbahani, A. I.;Goldstein, R. J.
  6. J. Electrochem. Soc. v.137 no.6 Overall mass transfer between a solid surface and submerged or unsubmerged liquid multijets Bensmaili, A.;Coueret, F.
  7. Int. J. Heat Mass Transfer v.19 Local and average transfer coefficients due to an average transfer coefficients due to an impinging row of jets Koopman, R. N.;Sparrow, E. M.
  8. ASME J. Heat Transfer v.116 Effects of interactions between adjoining rows of circular, free surface jets on local heat transfer from the impingement surface Slayzak, S. J.;Viskanta, R.;Incropera, F. P.
  9. ASME J. Engng. for Power Effects of crossflow on impingement heat transfer Metzger, D. E.;Korstad, R. J.
  10. AIAA Journal v.15 no.2 Mixing of a row of jets with a confined cross flow Holdman, J. D.;Walker, R. E.
  11. 대한기계학회논문집(B) v.21 no.9 단일수분류 및 수분류군에 의한 열전달(1)-단일수분류- 엄기찬;이종수;유지오