Abstract

Pulsations of a Biphase Nucleus of a Whirlwind at Detachable to the Form Hydrodynamical Cavitation

G.Kuznetsov (Wave Research Center of the General Physics Institute RAS, Moscow, Russia)

e-mail: kuznetsovgn@mtu-net.ru

The initial equations are received, theoretically and numerically changes of gas germs in a zone of a cylindrical whirlwind is investigated. Is shown, that bubbles under action of a gradient of pressure direct to a nucleus of a whirlwind and there collect. Experimentally in cavitations pipes are investigated exponential fading periodic pulsations of a biphase nucleus of a cylindrical whirlwind after its output from a stagnant zone. Is shown, that, despite of sharp increase of external pressure vapour pair-gas bubbles are not destroyed and are not dissolved in a trace, and all area of a nucleus with set of bubbles pulses. The theoretical research explains this effect: after compression of babbles radius of a physical nucleus of a whirlwind decreases, the speed of its rotation grows, that increases under-pressure in a zone of a nucleus. It results in growth of bubbles, increase of radius of a nucleus, increase of external pressure and compression of gas cavities. Further process repeats and some pulsations of a nucleus of a whirlwind are experimentally observed. The theoretical analysis well explains available experimental data.

Section : 4