280 .272 Lecture Notes - Static Mixer, Shear Rate, Viscosity
20 Jan 2017
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Document Summary
Mixing vessels with an impellor (or an agitator) Jet mixer (convert pressure to kinetic energy inducing momentum) Gas lifting (compressed gas at the bottom of tank pulls liquid up to drag forces) Blade is angled to ensure speed is uniform through width of liquid. Improvement on g the angle generates top to bottom flow. High re because inertia is high and viscosity is low. Rely on high inertia to mix the liquid throughout the vessel. Low re because inertia is low and viscosity is high. A process can be classified due to the phases being mixed or the underlying dynamic processes (there are usually more than one in each application) When designing a mixing vessel, find the best suited design for the process, know the power of the motor and height needed for the impellor. Fluid mechanics of impellors (pumping vs shear rate and circulation) Impellor power characteristics (a correlation between p, n and d)
