modelGraberRieger
Graber-Rieger: Liquid metal rod bundle; 1.25 <= P/D <= 1.95, 150 <= Pe <= 3000
Extends from TRANSFORM.Fluid.Pipes_Obsolete.ClosureModels.HeatTransfer.BaseClasses.PartialPipeFlowHeatTransfer (Base class for pipe heat transfer correlation in terms of Nusselt number heat transfer in a circular pipe for laminar and turbulent one-phase flow).
Information
The Graber-Rieger is a liquid metal rod bundle heat transfer correlation.
The correlation was taken from the following textbook:
AlanE. Waltar, Donald R. Todd, Pavel V. Tsvetkov
Fast Spectrum Reactors 2012
eq. 9.34 pg. 257
and is reported valid for:
- liquid metal coolant
- 1.25 <= Pitch/Diameter <= 1.95
- 150 <= Peclet Number <= 3000
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Real | PDratio | Tube Pitch to Diameter ratio | |
| Internal Interface | |||
| Integer | nHT (from PartialHeatTransfer) | 1 | Number of heat transfer segments |
| Boolean | use_k (from PartialHeatTransfer) | false | = true to use k value for thermal isolation |
| Ambient | |||
| SI.CoefficientOfHeatTransfer | k (from PartialHeatTransfer) | 0 | Heat transfer coefficient to ambient |
| SI.Temperature | T_ambient (from PartialHeatTransfer) | system.T_ambient | Ambient temperature |
| Internal Interface › Geometry | |||
| Real | nParallel (from PartialFlowHeatTransfer) | number of identical parallel flow devices | |
| Initialization | |||
| SI.CoefficientOfHeatTransfer | alphas_start (from PartialFlowHeatTransfer) | heat transfer coefficient | |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Fluid.Interfaces.HeatPorts_a | heatPorts (from PartialHeatTransfer) | Heat port to component boundary |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Medium.ThermodynamicState | states (from PartialHeatTransfer) | Thermodynamic states of flow segments | |
| SI.Area | surfaceAreas (from PartialHeatTransfer) | Heat transfer areas | |
| SI.HeatFlowRate | Q_flows (from PartialHeatTransfer) | Heat flow rates | |
| Modelica.Fluid.System | system (from PartialHeatTransfer) | System wide properties | |
| SI.Temperature | Ts (from PartialHeatTransfer) | Medium.temperature(states) | Temperatures defined by fluid states |
| SI.MassFlowRate | m_flows (from PartialFlowHeatTransfer) | Mean flow rate in segments | |
| SI.Length | lengths (from PartialFlowHeatTransfer) | Lengths along flow path | |
| SI.Length | dimensions (from PartialFlowHeatTransfer) | Characteristic dimensions for fluid flow (diameter for pipe flow) | |
| SI.Area | crossAreas (from PartialFlowHeatTransfer) | Cross flow area of flow segments | |
| SI.Height | roughnesses (from PartialFlowHeatTransfer) | Average heights of surface asperities | |
| SI.CoefficientOfHeatTransfer | alphas (from PartialFlowHeatTransfer) | Coefficient of heat transfer | |
| Real | Res (from PartialPipeFlowHeatTransfer) | Reynolds numbers | |
| Real | Prs (from PartialPipeFlowHeatTransfer) | Prandtl numbers | |
| Real | Nus (from PartialPipeFlowHeatTransfer) | Nusselt numbers | |
| Medium.Density | ds (from PartialPipeFlowHeatTransfer) | Densities | |
| Medium.DynamicViscosity | mus (from PartialPipeFlowHeatTransfer) | Dynamic viscosities | |
| Medium.ThermalConductivity | lambdas (from PartialPipeFlowHeatTransfer) | Thermal conductivity | |
| Real | Pes | Peclet Number |