.TRANSFORM.Utilities.CharacteristicNumbers.BiotNumber

Information

Defined to be the ratio of an internal resistance to an external resistance.

In the context of species or mass transfer, it is the ratio of the internal species transfer resistance to the boundary layer species transfer resistance.

• Bi = alpha_m*L/D_ab

In the context of the thermal fluids, it is ratio of the internal thermal resistance of a solid to the boundary layer thermal resistance.

• Bi = alpha*L/lambda

Interface

function BiotNumber
  extends Modelica.Icons.Function;
  input SI.CoefficientOfHeatTransfer alpha "Heat transfer coefficient";
  input SI.Length L "Characteristic length";
  input SI.ThermalConductivity lambda "Thermal conductivity (e.g., of the solid)";
  output Units.NonDim Bi "Biot number";
end BiotNumber;