Mechanics

2001, No. 4

V.I. Astafiev, L.M. Berkovich, Y.N. Radayev

VIII^th RUSSIAN CONGRESS ON THEORETICAL AND APPLIED MECHANICS

The paper informs about the VIIIth Russian Congress on Theoretical and Applied Mechanics held in Perm, August 23-29,2001. This Congress is the first gathering of Russian scientists whoes academic and research activities aim at theoretical and applied mechanics since August 1991. The Congress should be considered as a clear indication of the signi cant progress in studies on theoretical and applied mechanics in Russia.

N.I. Klyuev, V.A. Bruyaka

MATHEMATICAL MODELLING INTERACTION OF COUNTER STREAMS OF VAPOUR AND FLUID IN HEAT-PIPES

In the paper, mathematical models for interaction of vapour and fluid in a heat-pipe with capillary structure and in a vertical cylidrical thermosiphon are developed. The study of the critical mode for the streams of vapour and fluid is based on the numerical solution of governing equations. The formulas of the pressure loss in fluid and the wall friction of a heat-pipe and surface of fluid in the both dimensional and dimensionless forms are obtained. In the case of negligible interaction of vapour and fluid the corresponding results are compared with the solution of Poiseuille. The limiting heat flux are computed by the aid of Webers criterion. The results are compared with available experimental data.