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

The Korean Society of Mechanical Engineers (대한기계학회)
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An Experimental Study on Resonance of Temperature Field by Low-Frequency Oscillating Wall in a Side Heated Enclosure

저 주파수 벽면 가진에 의한 밀폐공간 내부 온도장의 공진 특성 실험

  • Kim, Seo-Yeong (Thermal Flow Control Research Center, Korea Institute od Science and Technology ) ;
  • Kim, Seong-Gi (Thermal Flow Control Research Center, Korea Institute od Science and Technology) ;
  • Choe, Yeong-Don (Korea University)
  • Published : 2001.09.01
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Abstract

An experimental study has been conducted to elucidate the resonance of natural convection in a side-heated square enclosure having a mechanically oscillating bottom wall. Under consideration is the impact of the imposed oscillating frequency, amplitude and the system Rayleigh number on the fluctuation of air temperatures. The experimental results show that the magnitude of the fluctuation of air temperature is substantially augmented at a specific forcing frequency of the oscillating bottom wall. The resonant frequency is increased with the increase of the Rayleigh number and it is little affected by the amplitude of the oscillating wall. It is also found that the resonant frequency is relevant to the Brunt- V$\"{a}$iS$\"{a}$l$\"{a}$ frequency which represents the stratification degree of the system.

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References

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