modelDittusBoelter1930
The Dittus-Boelter correlation for turbulent single phase flow
Extends from Greenhouses.Flows.FluidFlow.HeatTransfer.BaseClasses.PartialSinglePhaseCorrelation (Base class for single-phase heat transfer correlations), Greenhouses.Flows.FluidFlow.HeatTransfer.BaseClasses.PartialPlateHeatExchangerCorrelation (Base class for heat transfer correlations for plate heat exchangers).
Information
The model DittusBoelter extends the partial model PartialSinglePhaseCorrelation and allows the user to define the value of the hydraulic diameter for the calculation of the heat transfer coefficient based on the DittusBoelter correlation.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | a | 0.023 | Factor: 0.023 pipe, 0.035 plate HX? |
| Real | b | 0.800 | Reynolds exponent |
| Real | c | 0.400 | Prandl exponent: 0.4 heating, 0.3 cooling |
| Geometry | |||
| Modelica.Units.SI.Length | a_hat (from PartialPlateHeatExchangerCorrelation) | 0.002 | Corrugation amplitude |
| Modelica.Units.SI.Angle | phi (from PartialPlateHeatExchangerCorrelation) | Modelica.Units.Conversions.from_deg(45) | Corrugation angle |
| Modelica.Units.SI.Length | Lambda (from PartialPlateHeatExchangerCorrelation) | 0.0126 | Corrugation wavelength |
| Modelica.Units.SI.Length | B_p (from PartialPlateHeatExchangerCorrelation) | 0.1 | Plate flow width |
| Advanced geometry | |||
| Real | X (from PartialPlateHeatExchangerCorrelation) | 2*Modelica.Constants.pi*a_hat/Lambda | Wave number |
| Real | Phi (from PartialPlateHeatExchangerCorrelation) | 1/6*(1 + sqrt(1 + X^2) + 4*sqrt(1 + X^2/2)) | Enhancement factor |
| Modelica.Units.SI.Length | d_h (from PartialPlateHeatExchangerCorrelation) | 4*a_hat/Phi | Characteristic length |
| Modelica.Units.SI.Area | A_cro (from PartialPlateHeatExchangerCorrelation) | 2*a_hat*B_p | Cross-sectional area |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.MassFlowRate | m_dot (from PartialHeatTransferCorrelation) | Inlet massflow | |
| Modelica.Units.SI.HeatFlux | q_dot (from PartialHeatTransferCorrelation) | Heat flow rate per area [W/m2] | |
| Modelica.Units.SI.CoefficientOfHeatTransfer | U (from PartialHeatTransferCorrelation) | ||
| Medium.ThermodynamicState | state (from PartialSinglePhaseCorrelation) | Thermodynamic state | |
| Modelica.Units.SI.CoefficientOfHeatTransfer | alpha (from PartialPlateHeatExchangerCorrelation) | The calculated HTC | |
| Modelica.Units.SI.Length | cLen | Characteristic length | |
| Modelica.Units.SI.Velocity | cVel | Characteristic velocity | |
| Modelica.Units.SI.ReynoldsNumber | Re | ||
| Modelica.Units.SI.PrandtlNumber | Pr | ||
| Modelica.Units.SI.NusseltNumber | Nu | ||
| Medium.ThermalConductivity | lambda | ||
| Medium.DynamicViscosity | eta | ||
| Medium.Density | rho | ||
| Modelica.Units.SI.VolumeFlowRate | V_dot |