Principles of Work
Fluid undergoes shear when one area of fluid travels with a different velocity relative to an adjacent area. A high-shear mixer uses a rotating impeller or high-speed rotor, or a series of such impellers or inline rotors, usually powered by an electric motor, to "work" the fluid, creating flow and shear. The tip velocity, or speed of the fluid at the outside diameter of the rotor, will be higher than the velocity at the centre of the rotor, and it is this velocity difference that creates shear.
A stationary component may be used in combination with the rotor, and is referred to as the stator. The stator creates a close-clearance gap between the rotor and itself and forms an extremely high-shear zone for the material as it exits the rotor. The rotor and stator combined together are often referred to as the mixing head, or generator. A large high-shear rotor–stator mixer may contain a number of generators.
Key design factors include the diameter of the rotor and its rotational speed, the distance between the rotor and the stator, the time in the mixer, and the number of generators in the series. Variables include the number of rows of teeth, their angle, and the width of the openings between teeth.
Read more about this topic: High-shear Mixer
Famous quotes containing the words principles of, principles and/or work:
“Though the ancients were ignorant of the principles of Christianity there were in them the germs of its spirit.”
—Herman Melville (1819–1891)
“I cannot consent that my mortal body shall be laid in a repository prepared for an Emperor or a King—my republican feelings and principles forbid it—the simplicity of our system of government forbids it.”
—Andrew Jackson (1767–1845)
“Work is an essential part of being alive. Your work is your identity. It tells you who you are. It’s gotten so abstract. People don’t work for the sake of working. They’re working for a car, a new house, or a vacation. It’s not the work itself that’s important to them. There’s such a joy in doing work well.”
—Kay Stepkin, U.S. baker. As quoted in Working, book 8, by Studs Terkel (1973)