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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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A Study on the Visualization and Characteristics of Mixed Convection between Inclined Parallel Plates Filled with High Viscous Fluid

경사진 평행평판 내 고 점성유체의 혼합대류 열전달 특성 및 가시화에 관한 연구

  • Piao, Ri-Long (Department of Energy System Engineering, Graduate School, Pukuyong National University) ;
  • Bae, Dae-Seok (Department of Mechanical Engineering, Pukuyong National University)
  • 박일룡 (부경대학교 대학원 에너지시스템공학과) ;
  • 배대석 (부경대학교 기계공학부)
  • Published : 2006.09.01
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Abstract

Experiment and numerical calculation have been peformed to investigate mixed convection heat transfer between inclined parallel plates. Particle image velocimetry (PIV) with thermo-sensitive liquid crystal (TLC) tracers is used for visualizing and analysis. This method allows simultaneous measurement of velocity and temperature fields at a given instant of time. Quantitative data of the temperature and velocity are obtained by applying the color-image processing to a visualized image, and neural network is applied to the color-to-temperature calibration. The governing equations are discretized using the finite volume method. The results are presented for the Reynolds number ranges from 0.004 to 0.062, the angle of inclination, ${\Theta}$, from 0 to 45 degree and Prandtl number of the high viscosity fluid is 909. The results show velocity, temperature and mean Nusselt numbers distributions. It is found that the periodic flow of mixed convection between inclined parallel plates is shown at $0^{\circ}{\leq}{\Theta}<30^{\circ}$, Re<0.062, and the flow pattern can be classified into three patterns which depend on Reynolds number and the angle of inclination. The minimum Nusselt numbers occur at Re=0.05 regardless of the angle of inclination.

Keywords

References

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