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Homework Help: Spray dryers velocity

  1. Nov 6, 2007 #1
    Hello everybody, I'm new here.

    I'm working with spray driers and I need to know how does the velocity descent affect to the process.

    Can you help me?

    I need to know how the variables affect and the consequences.

    Thank you very much
  2. jcsd
  3. Nov 6, 2007 #2


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    Staff Emeritus
    Science Advisor

    One needs to elaborate more on the process. For example, what fluid is being sprayed, and on to what is it sprayed.

    In general, as the velocity of a fluid (e.g. water, air, gas, . . .) involved in forced convection increases, the heat transfer coefficient improves. Often the heat transfer coefficient is correlated with the Reynolds and Prandtl numbers, or the Nusselt number.

    If it's a drying process, then humidity of a gas would be important.

    If it involves a vortex separator, then the centrifugal force increases with velocity, and that would improve separation of liquid drops from a gas.

    It's difficult to offer any information without more specifics, e.g. temperature, pressure, mass flow rate, phases, . . . .
    Last edited: Nov 6, 2007
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