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Impeller 45 Degree Pitched Turbine | Flow Pattern | Geometrical Features and Applications

Chemical engineering industrial academy explain flow pattern produced by 45 degree pitched turbine impeller, its geometrical construction and applications in various industrial processes. Let us see some geometrical features, of a pitch blade turbine, a pitch blade turbine, consists of a hub with an even number of blades, bolted and tag welded on it, here we can see there is a hub, and the blades, the blade can be at any angle, between 10 and 90 degrees, from the horizontal, but the most common blade angle, is 45 degree. This lighter in weight than a propeller, of the same diameter, here we can see that a classical axial flow impeller, largely used in the marine applications, and in the new tank, for the other applications, the lighter in weight features of the pitch blade turbine, is advantageous in lighter gearbox, lighter diameter of shaft, and smaller size of motors, and other design features, here is the frequent applications of PBT, the first one is a liquid solid suspension, the pitch blade turbine can be used to : suspend solids in the liquids, a further example crystallizing from dissolution, or precipitation of crystal from the solutions, the very next is the salt suspension using PBT, radial flow impeller can be designed to suspend solids, especially if placed on the bottom of the tank, but are less efficient, and provide relatively lower solid homogeneity in the bulk, the very next, is a liquid blending, two or more liquids if you have to blend we can use a pitch blade turbine, successfully, The next is a heat, in the heat transfer applications, pitch blade turbine can be used to distribute the heat, from the hot coil or hot reservoir, and to the cold solution, or any cold contents, and next is the gas inducement or gas dispersion, using the PBT, we can introduce, we can disperse, we can induce gas in the liquid, pitch blade turbine remain the standard impeller, until the development of aero-foil or hydro-foil impeller, here we can see the two versions of the hydrofoil A310, and A315, which is more energy efficient, and process efficient impellers, as compared to pitch blade turbine. The next, the flow pattern produced by the pitch turbine, before discussing, the pattern produced by the pitch turbine we should know why impeller rotation is required? Impeller rotation is required to direct the flow toward the bottom head, or down pumping, violence in some situations such as a gas suspension, and floating solid mixing, up pumping, may be more effective, these are the two results, that's why the impeller is rotated in the stirrer tank. This turbine flow pattern, the flow discharge from a pitch blade, impeller has components, of both axial and radial flow velocity, in low to medium viscosity liquids, and is considered to be a mixed role, the impeller produced, both radial and axial components, here we can see that a radial component: out-throw the liquids towards the wall of the container, radially while the axial component, flow across z-axis of the vessel, in the upward and downward loop. A pitch blade turbine has a good balance of pumping and shear capabilities, and therefore it is considered to be a general-purpose impeller, this is the other feature, a radial flow impeller, on the other hand, produces two circulating loops as can be seen in the simulation, these two loops Produces, radial and axial both components, here we have a stirred tank fitted with PBT, when the agitator attains a uniform speed, we can see and observe the flow pattern very clearly, some portion of the liquid move radially towards the wall of the container and the meanwhile some liquid also move upward axially, this show that the presence of both components, axial and radial, and also liquid vortex, is present the in the center of the tank, due to the absence of the baffles, to address this problem, baffles are used, is higher using the PBT and two loops also exist as we have discussed earlier. #pitchedbladeturbine #mixinginindustry #flowpattern