The mixer is determined by multiple parameters, and it is impossible to describe a mixer with any single parameter. Shaft power (P), blade displacement (Q), pressure head (H), blade diameter (D) and stirring speed (N) are the five basic parameters that describe a mixer. The discharge volume of the blade is proportional to the flow rate of the blade itself, the first power of the blade speed and the third power of the blade diameter. The shaft power consumed by stirring is proportional to the specific gravity of the fluid, the power standard of the blade itself, the third power of the speed and the fifth power of the blade diameter. In the case of a certain power and blade form, the blade displacement (Q) and pressure head (H) can be adjusted by changing the matching of the diameter (D) and the speed (N) of the blade, that is, the large-diameter blade is equipped with A mixer with a low speed (to ensure that the shaft power remains unchanged) produces a higher flow effect and a lower pressure head, while a small diameter blade with a high speed produces a higher pressure head and a lower flow effect. In the stirred tank, the only way to make the micelles collide with each other is to provide a sufficient shear rate. From the perspective of the stirring mechanism, it is the existence of the fluid velocity difference that causes the fluid layers to mix with each other. Therefore, the fluid shear rate is always involved in the stirring process. Shear stress is a force that is the real cause of bubble dispersion and droplet breaking in mixing applications. It must be pointed out that the size of the shear rate at each point of the fluid in the entire stirred tank is not the same. The research on the shear rate distribution shows that there are at least four shear rate values ​​in a stirred tank. They are: Experimental research shows that as far as the blade area is concerned, no matter what kind of slurry type, when the blade diameter is constant , Both the maximum shear rate and the average shear rate increase with the increase of speed. But when the rotation speed is constant, the relationship between the maximum shear rate and the average shear rate and the diameter of the blade is related to the slurry type. When the rotation speed is constant, the maximum shear rate of the radial blade increases with the increase of the diameter of the blade, and the average shear rate has nothing to do with the diameter of the blade. These concepts about the shear rate of the blade area require special care in the design of the mixer to reduce and enlarge. Compared with large tanks, small tank mixers often have the characteristics of high rotation speed (N), small blade diameter (D) and low tip speed (ND), while large tank mixers often have low rotation speed (N). Characteristics of blade diameter (D) and high tip speed (ND) Popular keywords: 150L single-layer concentric different shaft mixer, cutting type automatic glue applicator, new type dehydration dryer, substrate conveyor, magnetic separator