As colloid mill theoretical research can be summarized as low pressure space, low temperature heat and mass transfer theory and thermal parameters and measurement methods, so according to the above method can be divided into three kinds of colloid mill model.

 

However, there are still some deficiencies in several models of colloid mill, which describe the heat transfer process more accurately and describe the error of mass transfer process. The main problem is that the solid-vapor phase transition occurs in the mass transfer process, water vapor is transferred in the porous channel, and the channel length changes with time, which is an unsteady process.

The structure size of the porous channel is also related to the pre-freezing speed, the material structure of the product to be colloidally milled and the like. There have not been any new breakthroughs from the research reports in recent years.

 

The theoretical focus of heat and mass transfer in the colloid mill process is to study the process that takes place inside the colloidal mill material. The theoretical research of unsteady flow field focuses on the low-pressure and low-temperature space environment outside the material mill, and describes the parameters of the space environment such as temperature, pressure, humidity and other parameters. These unsteady flow field simulation methods So far still a problem.

 

The problem of vapor-solid phase change is added to the unsteady flow field in the colloid mill condenser, which further complicates the research. Hopefully, in the near future, some scholars can form a complete set of theories through in-depth research and put into practice to bring convenience to the companies and enterprises.