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Title: On the effect of compressibility on the impact of a falling jet
Authors: Dias, Frederic 
Kjerland, Marc 
Ghidaglia, Jean-Michel 
Kjerland, Marc 
Christodoulides, Paul 
Keywords: Jet planes;Dimensionless numbers;Compressibility
Category: Electrical Engineering - Electronic Engineering - Information Engineering
Field: Engineering and Technology
Issue Date: 2010
Publisher: ISOPE
Source: 20th International Offshore and Polar Engineering Conference ISOPE, 2010, Beijing, China
Conference: International Offshore and Polar Engineering Conference ISOPE 
Abstract: At the first World Sloshing Dynamics Symposium that took place during the Nineteenth (2009) International Offshore and Polar Engineering (ISOPE) Conference in Osaka, Japan, it was made clear that simplified academic problems have an important role to play in the understanding of liquid impacts. The problem of the impact of a mass of liquid on a solid structure is considered. First the steady two-dimensional and irrotational flow of an inviscid and incompressible fluid falling from a vertical pipe, hitting a horizontal plate and flowing sideways, is considered. A parametric study shows that the flow can either leave the pipe tangentially or detach from the edge of the pipe. Two dimensionless numbers come into play: the Froude number and the aspect ratio between the falling altitude and the pipe width. When the flow leaves tangentially, it can either be diverted immediately by the plate or experience squeezing before being diverted. The profile of the pressure exerted on the plate is computed and discussed. Then the same problem is revisited with the inclusion of compressibility effects, both for the falling liquid and for the gas surrounding it. An additional dimensionless number comes into play, namely the Mach number. Finally, a discussion on the differences between the incompressible and compressible cases is provided.
ISSN: 1098-6189
Rights: © 2010 by The International Society of Offshore and Polar Engineers
Type: Conference Papers
Appears in Collections:Δημοσιεύσεις σε συνέδρια/Conference papers

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