modelGnielinski

Gnielinski pipe equations
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Extends from BaseClasses.PartialSinglePhaseCorrelation (Base class for single phase heat transfer correlations).

Information

The model Gnielinski extends the partial model PartialSinglePhaseCorrelation and computes the heat transfer coefficient based on the Gnielinski correlation.

inbook(Gnielinski2010)
Gnielinski, V.
VDI Heat Atlas
Stephan, P. (ed.)
Chapter G1 Heat Transfer in Pipe Flow
Springer, 2010, pp. 691-700

Parameters

TypeNameDefaultDescription
Modelica.SIunits.Lengthd_i0.003Hydraulic diameter (2*V/A_lateral)
Modelica.SIunits.Lengthl0.250Pipe or plate length
Modelica.SIunits.AreaA_croModelica.Constants.pi*d_i^2/4Cross section area

Components

TypeNameDefaultDescription
Medium.ThermodynamicStatestate (from PartialSinglePhaseCorrelation)Thermodynamic state
Modelica.SIunits.MassFlowRatem_dot (from PartialSinglePhaseCorrelation)Inlet massflow
Modelica.SIunits.HeatFluxq_dot (from PartialSinglePhaseCorrelation)Heat flow rate per area [W/m2]
Modelica.SIunits.CoefficientOfHeatTransferU (from PartialSinglePhaseCorrelation)
Modelica.SIunits.ReynoldsNumberRe
Modelica.SIunits.ReynoldsNumberRe_tur
Modelica.SIunits.ReynoldsNumberRe_lam
Modelica.SIunits.PrandtlNumberPr
Medium.ThermalConductivitylambda
Medium.DynamicViscosityeta
Medium.SpecificHeatCapacitycp
Medium.Densityrho
Modelica.SIunits.NusseltNumberNu_m_T_1
Modelica.SIunits.NusseltNumberNu_m_T_2
Modelica.SIunits.NusseltNumberNu_m_T_3
Modelica.SIunits.NusseltNumberNu_m_T
Realgamma
RealxtraReynolds correction factor
RealzetaFriction factor
RealKCorrection term
Modelica.SIunits.NusseltNumberNu_m
Modelica.SIunits.LengthcLenCharacteristic length
Modelica.SIunits.VelocitycVelCharacteristic velocity
Modelica.SIunits.NusseltNumberNu
Realnumerator
Realdenominator
Modelica.SIunits.VolumeFlowRateV_dot