Study on the Dynamic Pressure Modeling of High-Pressure Jet Homogenization

High-pressure jet homogenization is a key unit operation used in various industry sectors such as chemistry, pharmacy, special food and biotechnology. It is difficult to build the flow patterns and optimize the homogenizing unit for lacking of information on the flow conditions within the homogenizing valve. Based on the pressure measurements, the dynamic pressure change during homogenizing process was investigated thoroughly. Based on the methods of hydraulic system modeling, the fluid resistance and inductance were introduced to construct the dynamic pressure model during the whole round trip through the intensifier pump working process. According to the pressure and flow variations with time, the high pressure jet homogenizing process can be divided into three steps: pressure rising, pressure steady-state and pressure release. The results showed that the numerical pressure models were in agreement with the pressure measurements. It also indicated that the pressure and flow variations are closely related to the structure dimensions of the homogenizing valve (such as l, d, d₁) which can affect the time distribution of three parts directly. The numerical pressure model can be used for working parameters optimization and homogenization mechanism analyzing. It can also provide the reference for designing new type homogenizing valve and motion controlling of bi-directional intensifier pumps.