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- Schmid, P. J., et al.
(författare)
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On the stability of a falling liquid curtain
- 2002
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Ingår i: Journal of Fluid Mechanics. - 0022-1120 .- 1469-7645. ; 463, s. 163-171
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Tidskriftsartikel (refereegranskat)abstract
- The stability of a falling liquid curtain is investigated. The sheet of liquid is assumed two-dimensional, driven by gravity and influenced by a compressible cushion of air enclosed on one side of the curtain. The linear stability problem is formulated in the form of an integro-differential eigenvalue problem. Although experimental efforts have consistently reported a peak in the low-frequency range of the spectrum, the linear stability results do not show instabilities at these frequencies. However, a multi-modal approach combined with a projection onto low-frequency modes reveals a dominant and robust instability feature that is in good agreement with experimental measurements. This instability manifests itself as a wave packet, consisting of a linear superposition of linear global modes, that travels down the curtain and causes a strong pressure signal in the enclosed air cushion.
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