Experimental Study of Gas Entrainment by Free Jets of Water-Slurry Suspensions into Tubes of Shell-and-Tube Jet-Injection Apparatus

In industries, the task of intensifying the process of dissolving gases in liquid media is relevant, since the time of the technological cycle depends on its course. Absorption processes affect the quality of the finished product and energy costs. In the food industry shell-and-tube jet injectors (SJT) are widespread, in which the mechanical injection of a free-falling jet of liquid surrounding its gas is applied. The aim of this work is to investigate the process of gas entrainment by free jets of water-malt slurry (WSS) in the pipes of the SJT. The set goal was achieved by solving the tasks: creating an experimental stand to study the process of atmospheric air injection by water-salt suspensions in the tubes of the SJT; developing a methodology for experimental studies; conducting research on the processes of gas injection by free liquid jets depending on the flow rate and liquid concentration. The most important result of the work is the establishment of graphical and mathematical dependences for the investigated WSS hydromodules, which allow calculating the flow rate carried away by the jet depending on the nozzle diameter. It is found that the gas phase entrainment by free suspension jets is influenced by the viscosity of the suspension, which depends on a number of technological parameters. The practical significance of the obtained results consists in the proposed methodology for calculating the design characteristics of SISA, providing the highest efficiency of its operation taking into account the properties of working environments and parameters of technological processes.