Speeds of free emersion of bubbles (the viscous mode of emersion) are investigated, at emersion of bubbles as quasifi rm sphere under Stokess law. Emersion speeds at deformations of bubbles from spherical to griboobrazny are considered; at the square law of resistance of emersion of large bubbles, at the slow expiration of gas in the landlocked volume of liquid from an opening. Infl uence of geometry of channels on the speed of emersion of bubbles is analyzed. For processing of experimental data semi-empirical methods of the theory of similarity are used.

The results of complex studies of the parameters of the heat-conducting collectors, development of the methods for their calculation are presented. The main diffi culty in this case is the calculation of the design and parameters in the region of the contact zone between the heat pipe and the heat-generating surface. It is shown that the calculation methods used for convective collectors can not be applied to collectors with heat pipes in which the elements do not depend on each other. It is established that semiempirical models provide an opportunity to study the specifi cs of the processes taking place in the reservoir, the degree of their infl uence on its effi ciency. The simplifi ed calculation technique proposed in this article allows us to make the required estimates and calculations at the engineering level.