Vorob'ev

A non-stationary process of heat transfer in an insulated ordered multilayer nanostructure with specified initial temperature distribution was considered in the article. The structure consists of 1000 alternating layers of AlAs and GaAs. A heat transfer process model based on heat balance of a single layer was described in this paper. This model was used for heat transfer computations in ordered binary multilayer nanostructures for the first time. A process of heat transfer was investigated at different time moments, with different thicknesses of layers and heat resistances of interfaces. A case of deviation of periodicity in the structure was considered.

The new method of numerical estimation of mechanical impulse is passed to the channel wall by cavitating gas-bubble collapsed near the one, was developed.For the first time the process of influence of cavitating bubble on a channel wall was considered as a point explosion in an incompressible liquid. The process of  influence of empty cavity that is generated on the place of collapse cavitating bubble, on the channel wall was considered. The influence of  beginning radius of cavitating bubble and a distance to channel wall on a impulse value was investigated.    The  cavitating bubble has spherical shape, process of bubble evolution is adiabatic; liquid – water.

The authors developed a method for numerical evaluation of the mechanical momentum transferred to the wall by the gas-bubble cavitation at the moment when it collapses near the wall of the channel. For the first time the impact of the cavitation bubble on the wall is considered as a point explosion in an incompressible fluid. The impact of the empty cavity formed on the spot of the explosion of the bubble on the wall of the channel. The authors obtained the dependence of the momentum transferred to the channel wall on the initial bubble radius and the distance to the wall on which the bubbles collapses. The cavitation bubble is considered spherical, and the process of its evolution is adiabatic. In the calculations the authors considered water as the liquid.