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I am working on a problem involving spray dryers. The material to be dryed would be injected through a rotating nozzle with multiple openings from the top. Hot air would be blown from the dryer's bottom part. I was wondering how can I approach the problem to find out the particle's terminal velocity and how is terminal velocity related to reynolds number.any help will be appreciated.
thanks
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Terminal Velocity In Spray Dryers
Started by Guest_elmariachi_*, Feb 20 2006 07:08 PM
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sgkim
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Posted 09 March 2006 - 11:53 AM
Hi,
Terminal velocity is the dynamically balancing velocity of drag force exerted on the particle and the gravity force of a particle. It can be calculated from the balancing equation. The key issues is how to estimate the drag coefficient Cd in the equation Fd = (Cd)*Ap*u^2/2g.
A great deal of references and texts are available on the subject captioned. For low particle Reynolds numbers(Rep) below 0.1, the drag coefficnent is inversely proportional to Rep. Transition region is in the range of Re=0.1~1000, and Re>1000 for Newtonian. Refer to Perry's CEH which summaizes the ways to estimate the drag coefficients for various shape of particles.
Terminal velocity is the dynamically balancing velocity of drag force exerted on the particle and the gravity force of a particle. It can be calculated from the balancing equation. The key issues is how to estimate the drag coefficient Cd in the equation Fd = (Cd)*Ap*u^2/2g.
A great deal of references and texts are available on the subject captioned. For low particle Reynolds numbers(Rep) below 0.1, the drag coefficnent is inversely proportional to Rep. Transition region is in the range of Re=0.1~1000, and Re>1000 for Newtonian. Refer to Perry's CEH which summaizes the ways to estimate the drag coefficients for various shape of particles.
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