Kobyzev

pp. 106-120

The authors present results of theoretical investigations of heat and mass transfer processes in devices applicable to perform cooling and dehydration of hydrocarbon fuel in the start and technical space center complex. According to the results of the research the authors built a rational scheme of hydrocarbon fuel preparation system with due regard to temperature and moisture content, using storage tanks and storage containers, barbotage machines for preparation of fuel according to moisture content and temperature with use of cold of liquid nitrogen and the cold produced by evaporation of liquid nitrogen of gas nitrogen in the contact heat exchanger. The authors outline advantages of the proposed system over the systems based on the use of vapor-compression refrigeration machines.

The author evaluates the possibility of hydrocarbon rocket fuel (UVG) drainage from the water which it contains by means of bubbling it with gaseous nitrogen. The author indicates water concentration in as-received condition of UVG and provides physical UVG parameters, calculates similarity numbers which are necessary for calculating the parameters of bubble motion and convective diffusion of water into a gas bubble for the case of stationary emersion of the bubble. The data cover UVG temperature range from -40 to 30 ° C and diameters of bubbles from 1 to 4 millimeters, which corresponds to the parameters of bubblers used in launch and technical complexes of rocket-space technology. The results of calculating mass transfer coefficient are given.