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Blender principle:

Blender is determined by a number of parameters, it is impossible to describe a single mixer with any single parameter. Shaft power (P), paddle drain (Q), head (H), paddle diameter (D), and stirrer speed (N) are five basic parameters that describe a mixer. The displacement of the blade is proportional to the flow rate of the blade itself, the first-order speed of the blade and the third power of the blade diameter. The agitation shaft power consumption is proportional to the specific gravity of the fluid, the power of the blade itself, the power of the cube and the fifth power of the blade diameter. The blade discharge (Q) and head (H) can be adjusted by changing the diameter (D) of the blade and the speed (N) at a given power and blade type, ie, the large diameter blade Blenders that operate at low speeds (ensuring constant shaft power) produce higher flow and lower head pressure, while smaller diameter blades, accompanied by higher speeds, result in higher heads and lower flow. In a stirred tank, the only way to get the micelles to collide with each other is to provide sufficient shear rate.

From the stirring mechanism, it is precisely because of the difference of fluid velocity that the fluid layers are mixed with each other. Therefore, the stirring process always involves the fluid shear rate. Shear stress is a force that is the real cause of bubble dispersion and droplet breakage in stirred applications. It must be pointed out that the size of the fluid in the entire mixing tank shear rate is not the same point. Through the study on the distribution of shear rate, there are at least four shear rate values in a stirred tank, which are: Experimental studies show that in the case of the blade zone, whatever the slurry type, when the blade diameter is constant , The maximum shear rate and the average shear rate increase with the increase of rotational speed. However, when the speed is constant, the relationship between the maximum shear rate and the average shear rate and the blade diameter is related to the slurry type. When the rotation speed is constant, the maximum shear rate of radial blade increases with the increase of blade diameter, while the average shear rate has nothing to do with the blade diameter. These concepts of blade zone shear rates require special care in mixer design and zooming out. Small tank mixers often feature high speed (N), small propeller diameter (D), and low tip speed (ND) due to their smaller slots than large tanks, whereas large tank mixers tend to have low speed (N) Blade diameter (D) and high tip speed (ND) and other characteristics.