Studies of Aerodynamic Breakup, Cavitation and Rupture of Fluids
Final rept. 1 May 1998-31 Dec 2001
MINNESOTA UNIV MINNEAPOLIS DEPT OF AEROSPACE ENGINEERING AND MECHANICS
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The problem of breakup of masses of liquid agents moving at supersonic speeds at high altitudes is important for missile defense and other Army problems. Traditionally such studies are carried out in expensive field, sled and reverse ballistic tests. To reduce costs and improve controllability, we have built a shock tube with Mach 8 capability to study breakup it works Well and we are taking some data see httpwwW.aem.umn.eduresearchAerodynamicBreakup. This proposal is to do systematic comparisons of breakup on a wide range of simulants using our shock tube and to do theoretical studies to interpret the data. Another goal is to embed breakup studies in as yet underdeveloped branch of mechanics which I call the breaking strength of materials. The theory of cavitation, the tensile strength of liquids and the fracture of amorphous solids may be framed in a unified manner in which the breaking strength is compared to stresses along the principle axes of stress. The formation of cracks or bubbles is probably controlled by the mobility of the material which can be different even in the same material, say, in molten and frozen glass. We seek to make a connection between the aerodynamic breakup of liquids and topics related to cavitation, condensation. diffusion and outgassing of dissolved gas.
- Fluid Mechanics