Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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The natural convection in a three dimensional enclosure using color capturing technique and computation

색상 포착 기법과 수치계산을 이용한 3차원 밀폐 공간내의 자연대류 연구

  • 이기백 (부산대학교 공과대학 기계공학과) ;
  • 김태영 (부산대학교 기계공학과) ;
  • 양장식 (부산대학교 기계기술연구소)
  • Published : 1997.12.01
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Abstract

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.

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References

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