Fluids

Fluids

Wall boundary condition (Convection heat)

    • Daicha
      Subscriber

      Hello Experts.


       


      In my simulation, I would like set convection heat boundary condition at wall boundary (2D simulation)


      So, heat flux at boundary can be expressed as following equation.


      q =h*(T(outside)-T(fluid))


      where q : heat flux from wall to fluid [w/m2], h: Convection Heat Transfer coefficient [W/m2 K], T(outside): Wall temperature, [K]


      T (fluid): Fluid cell temperature next to wall [k]


       


      According to fluent user's guide, this setting can be set at fluent's (boundary condition→ thermal→convection boundary condition)


      So i did this setting However, the amount of heat flux was lower than I imagined.


       


      So my  questions are 


      1. Are any problems in terms of heat flux caused if i simulate under 2D, cylinder symmetry, millimeter, condition ?


      2. In the setting page of convection boundary condition, we can set heat generation rate [W/m3]. How is this value used for heat flux calculation ? (If possible, I would like you to indicate the specific equation )


       


      Best Regards

    • DrAmine
      Ansys Employee

      1/Should work: if 2D think about the reference depth you need to adjust to get the heat flux (W)


      2/That is another thing and you can think about it as a volumetric source for the wall which now requires a finite thickness

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