working principle
The mixer is determined by a number of parameters, and it is not possible to a mixer with any single parameter. The shaft power (P), the blade discharge (Q), the indenter (H), the blade diameter (D) and the stirring speed (N) are five basic parameters describing a stirrer. The displacement of the blades is proportional to the flow rate of the blades themselves, the primary side of the blade speed and the third power of the blade diameter. While the shaft power consumed by the stirring is proportional to the specific gravity of the fluid, the power of the blade itself, the cubic power of the speed and the fifth power of the blade diameter. In the case of a certain power and paddle, the paddle discharge (Q) and the indenter (H) can be adjusted by changing the matching of the diameter (D) and the speed (N) of the blade, i.e., the large diameter paddle The low speed (guaranteed shaft power constant) of the mixer produces a higher flow and a lower pressure head, while the small diameter blades with high speed produce a higher pressure head and a lower flow action. In the mixing tank, the only way to make the micelles collide with each other is to provide sufficient shear rate. From the mixing mechanism, it is precisely because the fluid velocity difference exists, so that the fluid layer between each other, so that the mixing process is always related to the fluid shear rate. Shear stress is a force that is the real cause of bubble dispersion and droplet breakage in mixing applications. It must be noted that the size of the shear rate of the fluid in the whole stirred tank is not uniform. The study of the shear rate distribution shows that there are at least four shear rate values in a stirred tank, which are: experimental studies show that, in the case of paddles, no matter what type of pulp, when the blade diameter is constant , The maximum shear rate and the average shear rate increase with increasing speed. However, when the 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 speed is constant, the maximum shear rate of the radial blade increases with the diameter of the blade, and the average shear rate is independent of the blade diameter. The concept of shear rate in the paddle area requires special care in the reduction and enlargement of the mixer. Small trough mixers often have characteristics such as high speed (N), small blade diameter (D) and low tip speed (ND), and large tank mixers often have low speed (N) large Blade diameter (D) and high tip speed (ND) and other characteristics.
describe
The mixer is determined by a number of parameters, and it is not possible to a mixer with any single parameter. The shaft power (P), the blade discharge (Q), the indenter (H), the blade diameter (D) and the stirring speed (N) are five basic parameters describing a stirrer. The displacement of the blades is proportional to the flow rate of the blades themselves, the primary side of the blade speed and the third power of the blade diameter. While the shaft power consumed by the stirring is proportional to the specific gravity of the fluid, the power of the blade itself, the cubic power of the speed and the fifth power of the blade diameter. In the case of a certain power and paddle, the paddle discharge (Q) and the indenter (H) can be adjusted by changing the matching of the diameter (D) and the speed (N) of the blade, i.e., the large diameter paddle The low speed (guaranteed shaft power constant) of the mixer produces a higher flow and a lower pressure head, while the small diameter blades with high speed produce a higher pressure head and a lower flow action. In the mixing tank, the only way to make the micelles collide with each other is to provide sufficient shear rate. From the mixing mechanism, it is precisely because the fluid velocity difference exists, so that the fluid layer between each other, so that the mixing process is always related to the fluid shear rate. Shear stress is a force that is the real cause of bubble dispersion and droplet breakage in mixing applications. It must be noted that the size of the shear rate of the fluid in the whole stirred tank is not uniform. The study of the shear rate distribution shows that there are at least four shear rate values in a stirred tank, which are: experimental studies show that, in the case of paddles, no matter what type of pulp, when the blade diameter is constant , The maximum shear rate and the average shear rate increase with increasing speed. However, when the 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 speed is constant, the maximum shear rate of the radial blade increases with the diameter of the blade, and the average shear rate is independent of the blade diameter. The concept of shear rate in the paddle area requires special care in the reduction and enlargement of the mixer. Small trough mixers often have characteristics such as high speed (N), small blade diameter (D) and low tip speed (ND), and large tank mixers often have low speed (N) large Blade diameter (D) and high tip speed (ND) and other characteristics.
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