The present review deals with the results of the experimental, theoretical, and numerical studies of the behavior of media under dynamic loading performed at a number of institutes of the Siberian Division of the Russian Academy of Sciences over the last decade. Both new formulations and continuations of the fundamental studies considered in [1] are discussed. These studies are primarily concerned with wave processes and flows that occur upon explosive loading of complex multiphase media, including the inversion of the twophase state and the rheology of cavitating liquids behind the front of intense rarefaction waves, waves in bubble media with a chemically active gas phase, waves in dense powder media and slug systems, and also explosion processes in grounds, cumulation, etc.
WAVES IN MULTIPHASE GAS-LIQUID SYSTEMSBubble Detonation. In the early 1980s, the formation of quasi-stationary waves in bubble systems such as inert liquid-chemically active gas and fuel (liquid)--oxidizer (gas) was discovered, and flow regimes were determined in which the energy lost by the wave during interaction with a bubble medium is compensated by the heat release due to the reaction in the gas mixture. Experimental studies in this field have been continued, in particular, to elucidate the fine structure of a bubble-detonation wave and to analyze the effect of bubble size on the wave propagation and parameters.Pinaev and Sychev [2] studied experimentally the existence conditions for detonation waves in gasliquid systems of various structures with a uniform distribution of bubbles 2-4 mm in diameter in a vertical shock tube 4 m long and 35 mm in diameter over a wide range of volume concentrations of the.gas phase (0.25 ~< k0 <~ 8%) and dynamic viscosity of the liquid phase (t.0t 9 10 -3 ~< v <~ t.89 Pa. sec).It was established that the critical amplitude of the initiating shock wave necessary for mixture ignition increases with increase in k0 and in the induction period r of the chemical reaction as a result of leaning or enrichment of the mixture and with decrease in the liquid viscosity. It turned out that the viscosity of the carrier liquid phase plays an important part in the formation of a detonation wave: in almost all the systems studied, the process enters a steady regime at v ~ 10 -2 Pa-sec and higher. The authors associate this effect with the increasing stability of the shape of the bubble surface during collapse.Sychev [3-6] studied detonation waves in multicomponent bubble media such as a mixture of bubbles of a chemically active gas with concentration kch and an inert gas with concentration kin, a mixture of bubbles with an oxidizing gas and a chemically active gas in a liquid fuel, and combinations of these systems. It was found that the presence of inert-gas bubbles has no effect on the structure but decreases the velocity of detonation waves and limits the region of existence of the waves to kin ~< 0.5kch. It turned out that the properties of inert gases affect the detonation parameters only when these gases dilute the...
