Fluids

Fluids

HTC on Graphic card

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    • Abubakar
      Subscriber

      Hi,

      I ran a Heat transfer simulation on a Graphic card but HTC which I got doesn't make any sense below I have shown the results which I got from the simulation.

      1. Nusselt number which I got from the simulation
    • Rob
      Ansys Employee
      You might want to read the definition of the HTC you're calculating in the manual.
    • Abubakar
      Subscriber
      Can you send me the link for the same?
    • DrAmine
      Ansys Employee
      Just hit F1 if you are in Fluent then go to User's Guide and check the definitions.

    • DrAmine
      Ansys Employee
    • Abubakar
      Subscriber
      I have user guide I am searching for the page where the calculation of HTC is explained

    • Abubakar
      Subscriber
      Please correct me if I am wrong Formula: HTC=q/(T_wall-Tcell)
      Fluent use above formula to calculate HTC and I am getting negative HTC coz of q.
      If I am correct I should not get NU=0 it should be some negative value, right?
    • DrAmine
      Ansys Employee
      Does depend on which HTC you are referring default one us called surface HTC uses reference temperature from reference values.
    • Abubakar
      Subscriber
      yes I am referring to Surface HTC
    • DrAmine
      Ansys Employee
      Then ref temperature is used. Adjust it if you need that
    • Abubakar
      Subscriber
      Sorry, I didn't get this. Actually, I wanted to know in my case what makes surface HTC negative and If HTC is something Nu should be zero, right?
    • Rob
      Ansys Employee
      What is the heat flux through each of the wall and wall:shadow pair?
    • Abubakar
      Subscriber
      do you want to see contour or an average value will be enough for you?
    • DrAmine
      Ansys Employee
      It gets the sign of the heat flux ongoing or outgoing you might take only the absolute as it is a derived quantity. For first case add a screenshot of heat flux report fir the wall and its shadow
    • Abubakar
      Subscriber
      Heat flux


    • DrAmine
      Ansys Employee
      Almost nice. I do not see any issue. Just nusselt number might be not defined fir solid zone. I won't be irritated by htc or nusselt numbers as they are not used at all by the solver.
    • Abubakar
      Subscriber
      sir & sir thanks for your clarification.
    • DrAmine
      Ansys Employee
      Welcome and good weekend
    • Abubakar
      Subscriber
      same to you!
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