Mechanical shock-induced nucleation in solution: Is cavitation necessary?

Supersaturation dependence of glycine polymorphism using laser-induced nucleation, sonocrystallization and nucleation by mechanical shock.

The nucleation of glycine from aqueous supersaturated solution has been studied using non-photochemical laser-induced nucleation (NPLIN), ultrasound (sonocrystallization), and mechanical shock of sample vials. It was found that at higher supersaturation, samples were more susceptible to nucleation and produced more of the γ-glycine polymorph. The results are described in terms of a mechanism co...

Shock wave measurements in cloud cavitation

One of the most destructive (and noisy) forms of cavitation is that referred to as “cloud cavitation” because it involves a large collection of bubbles which behave as a coherent whole. The present paper presents the results of an experimental study of the processes of collapse of a cavitation bubble cloud, specifically that generated by an oscillating hydrofoil in a water tunnel. Measurements ...

Numerical Solution for Gate Induced Vibration Due to Under Flow Cavitation

Among the many force s to which hydraulic structures are exposed to, the forces induced by cavitation incident are of typical hydrodynamic unknown forces. The aim of this study is to define these forces as coupled fluid-structure interaction under two dynamic effects. The first dynamic effect which incorporates facilities for dealing with cavitation fluid is based on the appearance and bursting...

Thermal nucleation and cavitation in helium-3 fluids

Nucleation of Crystals in Solution

Figure 1. Schematic illustration of the two-step mechanism of nucleation of crystals. A dense liquid cluster forms. A crystal nucleus may form inside the cluster. Top: Macroscopic viewpoint of events. Bottom: The free-energy ΔG along two possible versions of the two step nucleation mechanism. 0 L L G − Δ is the standard free energy of formation of dense liquid phase and 0 C G Δ —that of formati...