modelDittusBoelter

Dittus-Boelter heat transfer correlation
Diagram of DittusBoelter

Extends from BaseClasses.DistributedHeatTransferFV (Base class for distributed heat transfer models - finite volumes).

Parameters

TypeNameDefaultDescription
BooleanuseAverageTemperature (from DistributedHeatTransferFV)true= true to use average temperature for heat transfer
SI.Lengthl (from DistributedHeatTransferFV)L/(Nw)Length of a single volume
Modelica.SIunits.PerUnitkc (from DistributedHeatTransferFV)1Correction factor for heat transfer
Booleanheatingtruetrue if fluid is heated, false if fluid is cooled
RealRe_min10000Minimum Reynolds number
RealPr_min0.7Minimum Prandtl number
RealPr_max160Maximum Prandtl number
Set by Flow1D model
IntegerNf (from DistributedHeatTransferFV)2Number of nodes on the fluid side
IntegerNw (from DistributedHeatTransferFV)Nf - 1Number of volumes on the wall side
IntegerNt (from DistributedHeatTransferFV)Number of tubes in parallel
SI.DistanceL (from DistributedHeatTransferFV)Tube length
SI.AreaA (from DistributedHeatTransferFV)Cross-sectional area (single tube)
SI.Lengthomega (from DistributedHeatTransferFV)Wet perimeter of heat transfer surface (single tube)
SI.LengthDhyd (from DistributedHeatTransferFV)Hydraulic Diameter (single tube)
SI.MassFlowRatewnom (from DistributedHeatTransferFV)Nominal mass flow rate (single tube)

Connectors

TypeNameDefaultDescription
ThermoPower.Thermal.DHTVolumeswall (from DistributedHeatTransferFV)

Components

TypeNameDefaultDescription
Medium.ThermodynamicState[Nf]fluidState (from DistributedHeatTransferFV)
Medium.MassFlowRate[Nf]w (from DistributedHeatTransferFV)
Medium.Temperature[Nf]T (from DistributedHeatTransferFV)Temperatures at the fluid side nodes
Medium.Temperature[Nw]Tw (from DistributedHeatTransferFV)Temperatures of the wall volumes
SI.Power[Nw]Qw (from DistributedHeatTransferFV)Heat flows entering from the wall volumes
SI.Power[Nf - 1]Qvol (from DistributedHeatTransferFV)QwHeat flows going to the fluid volumes
SI.PowerQ (from DistributedHeatTransferFV)Total heat flow through lateral boundary
SI.CoefficientOfHeatTransfer[Nf]gammaHeat transfer coefficients at the nodes
SI.CoefficientOfHeatTransfer[Nw]gamma_volHeat transfer coefficients at the volumes
Medium.Temperature[Nw]TvolFluid temperature in the volumes
Medium.DynamicViscosity[Nf]muDynamic viscosity
Medium.ThermalConductivity[Nf]kThermal conductivity
Medium.SpecificHeatCapacity[Nf]cpHeat capacity at constant pressure
SI.PerUnit[Nf]ReReynolds number
SI.PerUnit[Nf]PrPrandtl numbers
SI.PerUnit[Nf]Re_lReynolds number limited to validity range
SI.PerUnit[Nf]Pr_lPrandtl number limited to validity range