Abstract
By unbounded flows, we mean those which have unlimited space in which to develop. In ordinary fluid mechanics, the boundary layers, mixing layers, wakes and jets constitute the main examples of this type of flow. Their properties show three types of essential characteristics which distinguish them from ducted flow:
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they have a finite but normally variable width as a function of time or of the abscissa due to viscous diffusion
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they are not subject to the conservation of flow rate, rather, they can draw in the surrounding fluid (the case of jets), or be drawn in by it (the case of wakes)
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they are however subject to another constraint, normally the invariance of the momentum flow rate when the flow of the surrounding fluid is uniform.
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Moreau, R. (1990). Unbounded flows. In: Magnetohydrodynamics. Fluid Mechanics and Its Applications, vol 3. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-7883-7_5
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DOI: https://doi.org/10.1007/978-94-015-7883-7_5
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