The jet can be directed straight down if it is submerged and is not aimed at the tank outlet. Small tanks (<4 m diameter) can also be mixed with a jet mixer. If the level drops below the target, however, the flow stream will hit the surface rather than the tank wall which reduces the mixing effectiveness. This gives a diagonal path across the centre of the tank. For large storage tanks, jet mixers are usually installed near the bottom of the side wall and aimed at the far wall just below the liquid surface. This will incorporate more of the contents compared to a shorter path. The length of the path from the nozzle to the tank wall should be as long as is practicable. Viscous fluids require more invasive mixing for them to achieve a uniform consistency and jet mixers will probably not give satisfactory results. You are seeking to establish flow that incorporates the entire contents of the tank. Jet mixers work best with Newtonian fluids with low (<0.01 Pa-s) viscosity. The jet stream typically spreads with an included angle of about 15° A typical arrangement is shown in Figure 2.įigure 2: The jet is usually positioned near the bottom of a large storage tank, angled toward the opposite liquid surface. For this article, I define a nozzle to be a plain pipe or tube where the pumped liquid is accelerated into the tank, as illustrated in Figure 1. This establishes a flow pattern that is similar to the pattern that mechanical agitators create. ![]() The wall dissipates the stream’s remaining energy and reflects the stream back into the tank. The flow rate and nozzle are designed to give a high-velocity stream that drags liquid in the tank and carries it to the tank wall. Liquid is pumped into a tank, below the surface, through a nozzle. This month, I am showing you how to size a jet mixer. While they are commonly used on very large storage tanks where mechanical agitation is impractical, jet mixers also can be effective on small tanks. They are an alternative to motor-driven agitators. JET MIXERS use the kinetic energy in a pumped stream to blend the liquid contents of a tank or reactor. Fill in zero (0) in the weight percent column (Wt%) if Base oil #3 and-or Base oil #4 are not part of the mixing viscosities.Stephen Hall discusses the golden rules for design You can use this calculator to predict mixing viscosities of 2-4 base oils. Viscosity temperature is not required but must be the same for all base oils viscosities. Fill in zero 0 (or leave default “0”) in Wt % if not included in the blending calculations. Please note: Leave the default value of “1” in the viscosity field if blending less than two liquids. If you don’t want to include 3rd and 4th base oils, fill any value (>1) in the viscosity cell and zero (0) in the Wt%.Ĥ- Repeat the same for Base Oil #4 by filling in the viscosity and Wt% of the Base oil.ĥ- Click Calculate to predict the mixing viscosity of the blend. ![]() Viscosity Calculator #3ġ- Fill the viscosity of Base oil #1 and weight percent (Wt%) in the third (Wt%) column.Ģ- Fill in the viscosity of Base Oil #2 and weight percent (Wt%) in the next column.ģ- Fill in the weight percent (Wt%) and Base oil #3 viscosity in the 3rd row. Module #3: Mixing viscosities calculator to blend or mix more than two base fluids.
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