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Equivalent hydraulic diameter VS equivalent heated diameter

Posted by Syeilendra Pramuditya on November 23, 2009

Please let me know if you found any mistake on this post, thanks!

Get confused about the difference between “equivalent hydraulic diameter” and “equivalent heated diameter” when doing your work about nuclear reactor thermal hydraulic analysis? I think it will be easier to be understood if I use example rather than give you formal definitions, check this out man..

Consider this case: three heater rods are immersed into a cylindrical duct filled with water, the heater rod radius and duct radius are Rrod and Rduct, respectively, as sketched in the following figure:

The equivalent hydraulic diameter is..

And the equivalent heated diameter is..


Source: Nuclear Systems I, Todreas-Kazimi, page 444 & 453.

What do you think dude..?


2 Responses to “Equivalent hydraulic diameter VS equivalent heated diameter”

  1. Reynold Dipu said

    Hm.. So far this explanation makes sense but in my point of view cross sectional area (A) should be cross section of stream (coolant stream) excluding three cross section of heater rods. What do you think? Btw, thank a lot for this explanation he..he..,

    Syeilendra says..
    I think you are right!
    I’m gonna fix it now
    Thanks! =D

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