The natural convection in a three dimensional enclosure using color capturing technique and computation

색상 포착 기법과 수치계산을 이용한 3차원 밀폐 공간내의 자연대류 연구

  • Published : 1997.12.01


The natural convection of a horizontal layer heated from below in a three-dimensional rectangular enclosure was dealt with both numerically and experimentally. The aspect ratios are 1:2:3.5 and Boussinesq fluid is water with the Prandtl number of 5.0. This experimental study showed how to measure the variation of temperature field in a 3-D rectangular enclosure with small aspect ratios by using TLC(Thermochromic Liquid Crystal) and color capturing technique. The experimental temperature field had periodic characteristics of 75 sec at Ra=2.37*10$^{5}$ . But the numerical convection flow had periodic characteristics of 79 sec at the same Rayleigh number. In three dimensional computation it was found that the convection roll structure bifurcated from four rolls to two rolls as the Rayleigh number is increased.


Color Capturing Technique;Thermochromic Liquid Crystal;Three Dimensional Enclosure;Periodic Convection


  1. J. Fluid Mech. v.66 Interferometric study of two-dimensional B nard convection cells Farhadieh, R.;Tankin, R. S.
  2. Ph. D. Dissertation, Pennsylvania State University A New Hue-Capturing Technique for the Quantitative Interpretation of Liquid Crystal Image Used in Convective Heat Transfer Studies Kim, K.
  3. In : Natural Convection in Enclosures, ASME HTD v.8 Three-Dimensional Convection Within Rectangular Boxes Oetel, H. Jr., aut.;K. E. Torrence;I. Catton, eds.
  4. Experiments in Fluids v.11 Digital Particle Image Thermometry : The Method and Implementation Dabiri, D.;Gharib, M.
  5. Numerical Heat Transfer and Fluid Flow Patankar, S. V.
  6. 대한기계학회논문집 v.19 no.9 선형 터빈케스케이드 끝벽의 열전달 특성에 관한 연구 양장식;나종문;이기백
  7. ASME Journal of Heat Transfer v.115 Evaluation of a Hue Capturing based Transient Liqiud Crystal Method for High-Resolution Mapping of Convective Heat Transfer on Curved Surfaces Camci, C.;Kim, K.;Hippensteele, S. A.;Poinsatte, P. E.
  8. 대한기계학회논문집(B) v.20 no.3 TLC와 컬러 화상처리를 이용한 Hele-Shaw Cell 내부 대류온도장 측정 윤정환;도덕희;이상준
  9. J. Fluid Mech. v.192 Three-Dimensional Thermal Cellular Convection in Rectangular Boxes Kirchartz, K. R.;Oertel JR. H.
  10. Journal of Heat Transfer v.110 Transitions and Birfurcations in Laminar Buoyant Flows in Confined Enclosures Yang, K. T.
  11. ASME Journal of Engineering for Gas Turbines and Power v.106 Liquid Crystal Visualization of Surface Heat Transfer on a Concaverly Curved Turbulent Boundary Layer Simonich, J. C.;Moffat, R. J.
  12. J. Fluid Mech. v.100 Many Routes to Turbulent Convection Gollub, J. P.;Benson, S. V.
  13. ASME FED v.85 Quantitative Thermal Flow Visualization Using Color Image Processing (Application to A Natural Convection Visualized by Liquid Crystals) Kimura, I.;Takamori, T.;Ozawa, M.;Takenaka, N.;Manabe, Y.
  14. ASME/JAME Thermal Engineering Proceedings v.1 Flow Transition in a Three-Dimensional Rectangular Enclosure Heated From Below Mukutmoni, D.;Yang, K. T.
  15. 대한기계학회 96년도 춘계학술대회 논문집(B) 화상처리기법을 이용한 온도장 및 속도장 동시 측정기법 개발 이상준;백승조;윤정환;도덕희
  16. Esp. in Fluid v.12 Flow and Temperature of Natural Convection in a Hele-Shaw Cell Using a Thermo-sensitive Liquid-Crystal Tracer Osawa, M.;Muller, U.;Kimura, I.;Takamori, T.
  17. Transactions of the ASME. v.115 Rayleigh-B nard Convection in a Small Aspect Ratio Enclosure:Part I-Bifurcation to Oscillatory Convection Mukutmoni, D. Yang, K. T.
  18. J. Fluid Mech. v.174 Nonlinear transition in three-dimensional convection Kessler, R.