 Multi Convection - MapleSim Help

Multi Convection

Multiple Heat Convection  Description

The Multi Convection component models multiple Heat Convections.

The total number of Heat Convection components is determined by the .

The following image uses Heat Convection components to illustrate the behavior of the Multi Convection component. Convection type Use reference for Natural / Forced Natural / Forced convection type Use Correction input Natural false - false or true true Vertical (Ra:10^4-10^13) false or true Horizontal Upper Warm(Ra:10^4-10^11) false or true Horizontal Upper Cold (Ra:10^5-10^11) false or true Forced false - false or true true Tube and Duct false or true Over flat plates false or true Over a cylinder false or true Over a sphere false or true Constant - - false or true External input - - false or true

(For details, see Heat Convection help). Equations (For details, see Heat Convection help). Variables  (For details, see Heat Convection help). Connections

 Name Units Condition Description Modelica ID $\mathrm{solid}\left[i\right]$ - - i-th thermal port of the solid side solid[i] $\mathrm{fluid}\left[i\right]$ - - i-th thermal port of the fluid side fluid[i] $h\mathrm{in}$ $\frac{W}{{m}^{2}\cdot K}$ if Convection type is External input. Input signal of the heat transfer coefficient h_in $v$ $\frac{m}{s}$ if Convection type is Forced. Input signal of Wind speed for Forced convection v $\mathrm{cor}\left[i\right]$ - if use correction input is true. Input signal of the correction factor for ${Q}_{\mathrm{flow}}$ cor[i] Parameters

 Symbol Default Units Description Modelica ID $\mathrm{Natural}$  Select Type of Convection  Natural : Natural convection  Forced : Force convection  Constant : Constant heat transfer coefficient  External input : Heat transfer coefficient given by input TypeOfMedium $\mathrm{false}$  If true, all parameters are defined by references. use_reference_natural $\mathrm{Vertical}\left(\mathrm{Ra}:10^4-10^13\right)$  Geometry type of Natural convection as references NaturalConvecType $\mathrm{false}$  If true, all parameters are defined by references. use_reference_forced  Geometry type of Natural convection as references ForcedConvecType $A$ $1.0$ ${m}^{2}$ Area of flow of each node A $X$ $1.0$ $m$ Streamwise length X $p$ $101325$ $\mathrm{Pa}$ Air pressure p $\mathrm{Nodes}$ $2$  Number of node numNode ${C}_{\mathrm{forced}}$  $0.664$  Gain parameter for Reynolds number in the generalized experimental equation of Forced convection generalized equation ${C}_{\mathrm{forced}}\cdot \left({\mathrm{Re}}^{{m}_{\mathrm{forced}}}-{\mathrm{offset}}_{\mathrm{forced}}\right)\cdot {\mathrm{Pr}}^{{n}_{\mathrm{forced}}}$ C_forced ${m}_{\mathrm{forced}}$ $\frac{1}{2}$  Exponent parameter for Reynolds number in the generalized experimental equation of Forced convection generalized equation m_forced ${\mathrm{offset}}_{\mathrm{forced}}$ $0$  Offset parameter for Reynolds number in the generalized experimental equation of Forced convection generalized equation offset_forced ${n}_{\mathrm{forced}}$ $\frac{1}{3}$  Exponent parameter for Prandtl number in the generalized experimental equation of Forced convection generalized equation n_forced ${C}_{\mathrm{lam}}$ $0.59$  Gain parameter for Reynolds number in the generalized experimental equation of Natural convection generalized equation when Fluid is laminar C_lam ${n}_{\mathrm{lam}}$ $\frac{1}{4}$  Exponent parameter for Reynolds number in the generalized experimental equation of Natural convection generalized equation when Fluid is laminar n_lam ${C}_{\mathrm{tur}}$ $0.1$  Gain parameter for Reynolds number in the generalized experimental equation of Natural convection generalized equation when Fluid is Turbulent C_tur ${n}_{\mathrm{tur}}$ $\frac{1}{3}$  Exponent parameter for Reynolds number in the generalized experimental equation of Natural convection generalized equation when Fluid is Turbulent n_tur $\mathrm{Threshold}$ ${10}^{9}$  Threshold value for Reynolds number to define Laminar or Turbulent TH $h$ $1$ $\frac{W}{{m}^{2}\cdot K}$ Constant heat transfer coefficient h $\mathrm{false}$  If true, input of correction for h is valid use_correction  See Also