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The article herein concerns direct conversion of thermal energy into mechanical energy of fluid motion by means of a specially designed thermomechanical pump. The conditions of fluid boiling in constraint environment were considered. The peculiarity of fluid evaporation in constraint environment when no natural convection is developed in the tubes is periodic overheating and explosive growth of vapour phase which leads to shooting the fluid out of the tube. Vapour slugs formed under slug boiling conditions are the...