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논문 기본 정보

자료유형
학술저널
저자정보
저널정보
대한설비공학회 International Journal of Air-Conditioning and Refrigeration Journal Of Air-Conditioning and Refrigeration Vol.10 No.1
발행연도
2002.3
수록면
50 - 63 (14page)

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The Kármán boundary-layer has been numerically investigated for the disturbance wave number, wave velocity, azimuth angle and radius (Reynolds number, Re). The disturbed flow over rotating disk can lead to transition at a much lower Re than that of the well-known Type Ⅰ instability. This early transition is due to the excitation of the Type Ⅱ. Presented are the neutral stability results concerning these instabilities by solving newly formulated stability equations with consideration of whole convective terms. When the present numerical results are compared with the previously known results, the value of critical Re corresponding to Type Ⅰ is moved from Rec.₁=285.3 to 270.2 and the value corresponding to Type Ⅱ is from Rec.₂= 69.4 to 36.9, respectively. Also, the corresponding wave number is moved from k₁=0.378 to 0.386 for Type Ⅰ; from k₂=0.279 to 0.385 for Type Ⅱ. For Type Ⅱ, the upper limit of wave number and azimuth angle is k_U=0.5872, ε_U=-17.5°, while its lower limit is near k_U=0, ε_U?-28.4°. This implies that the disturbances will be relatively fast amplified at small Re and within narrow bands of wave number compared with the previous results.

목차

Abstract

1. Introduction

2. The governing equations and numerical method

3. Results and discussion

4. Conclusions

Acknowledgements

References

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