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    Convection

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    Talib Al_Munawri
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    Posts : 337
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    Location : Sultanate of Oman

    Convection

    Post by Talib Al_Munawri on Mon Oct 25, 2010 9:12 pm




    Convection


    What is a convection?

    Heat transfer by convection arises from the mixing of element of fluid so energy transfred by mass motion of molecules.

    Mention types of convection? Write one example for each?

    - Nattural convection (mixing results of density differences)
    e.g. when a pool of liquid is heated from below

    - Forced convection (mixing resluts from eddy movement in the fluid)
    e.g. when a fluid flows through a pipe heated on the outside.

    Write important dimension less groups in convective heat transfer?

    - Nusselt number, Nu = hl / k ----- wall temperature gradient/ temperature gradient a cross the fluid in the pipe
    - Reynold number, Re = lVρ/µ ----- inertial force / Viscous force
    - Prandtl number, Pr = cρµ / k = v / α ---- Momentum diffusivity / thermal diffusivity


    Example:



    Answer:




    Example:



    Answer:






    Example:



    Answer:

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    Future Eng.
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    Posts : 25
    Join date : 2009-09-13
    Age : 30
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    Re: Convection

    Post by Future Eng. on Wed Oct 27, 2010 1:54 am

    wow

    great job mate.

    you have remind us about the Heat transfer

    Thanking you mate

      Current date/time is Mon Aug 21, 2017 4:02 am