The characteristics of the three mixing degrees of Micro are:

A measure of the uniformity of dispersion and blending achieved by mixing different materials. The degree of mixing is related to the scale examined. In order to evaluate and compare different mixing methods and mixing equipment, the appropriate expression can be selected according to the specific situation.

The degree of mixing of a fluid system can be expressed in the following three ways:

(1) The degree of uniformity is a measure of uniformity in general, that is, within the size range of the equipment. The evenness I of component A in the mixture is defined as:

or

where C is the average concentration of component A in the mixing tank; CA is the component in the sample taken The concentration of A. I=1 means uniform mixing, I=0 means no mixing occurs. The average uniformity of a certain component I is the arithmetic average of the uniformity of a certain component obtained based on several samples in the same tank. It can be used to measure the overall mixing effect of the material system, but the number of samples taken must be specified.

(2) A measure of the size of dispersed particles (such as droplets, bubbles or solid particles) in a separation scale mixture system. Within a range of separation scales, matter is homogeneous or has only one substance. The smaller the separation scale, the more uniform the mixing. For immiscible systems, it is impossible to achieve molecular-level separation scales.

(3) Separation strength is a measure of the uniformity of miscible systems on a small scale. During the mixing operation, there are mixture micelles of different sizes and concentrations in the mixed liquid. The difference between the micelle concentration and the average concentration of these mixtures is the separation strength. The smaller the separation strength, the more fully the materials are mixed and the blurr the interface between the microclusters (see figure). When the mixed material reaches the ideal mixing state through molecular diffusion, that is, when it reaches the so-called molecular scale uniformity, the separation strength is zero.

In the mixing equipment, the overall flow of the fluid is to improve the evenness of the mixture system, while the turbulent pulsation reduces the separation scale and separation strength.

The degree of mixing of a solid system is expressed by the standard deviation of the content of a certain component in the sample taken, that is:

In the formula, C is the average content of substance A; CA is the content of substance A in the i-th sample; n is the number of samples.