Research of tare hydrodynamic behaviour at sterilization of canned fish

The paper is devoted to research on improving the equipment that ensures the absolute safety of mineral nutrients in the production of sterilized canned fish. The results of experimental study of hydrodynamic characteristics moving sterilized jars of canned fish of different sizes under the influence of circulating gas-liquid heat-carrying medium in the capacity have been presented. Some experimental setup with organized top-down and bottom-up flows in it modeling a sterilizer (autoclave) has been proposed for the research. The experiments have been performed in the superficial gas velocity ranging from 0.03 m/s to 0.15 m/s corresponding to stable operation of the apparatus. Cans drag coefficient in the flow of heat-carrying medium has been determined by two methods for two heat-carrying media - pure glycerol and water solutions in experiments on precipitation and air - cans when blowing in the wind tunnel. The significant difference in the rates of cans upstream and downstream is reliably established, and therefore it has been proposed to use for the cans' motion characterization the indicator averaged over the two specified rates and called cans circulation speed. An empirical equation describing the dependence of the cans circulation rate from the superficial gas velocity has been obtained. Based on the analysis of studies some empirical dependencies on calculation of the drag coefficients of various types of packaging in the range of Reynolds criterion values from 1 to 4 000 have been offered. The necessity of using the qualifying factor for calculating the real drag on the results of the experiment has been determined.