modelHeatConvPipeInsideDynamic
Dynamic model for Heat Transfer through convection inside a pipe, based on Nussel Correlations
Extends from Modelica.Thermal.HeatTransfer.Interfaces.Element1D (Partial heat transfer element with two HeatPort connectors that does not store energy).
Information
Overview
This model represents the phenomenon of heat convection inside a pipe by a flowing medium.
The heat transfer coefficient at the inside could be calculated by formular from VDI-Waermeatlas or a fixed value can be choosen.
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August 11, 2017; by David Jansen:
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Modelica.Units.SI.Length | length | 1 | Length of total pipe |
| Modelica.Units.SI.Length | d_i | 0.02 | Inner diameter of exhaust pipe |
| Modelica.Units.SI.Area | A_sur | 2 | Surface for heat transfer |
| Boolean | calculateHConv | true | Use calculated value for inside heat coefficient |
| Modelica.Units.SI.CoefficientOfHeatTransfer | hConvInsideFix | 30 |
Connectors
| Type | Name | Default | Description |
|---|---|---|---|
| HeatPort_a | port_a (from Element1D) | ||
| HeatPort_b | port_b (from Element1D) |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| SI.HeatFlowRate | Q_flow (from Element1D) | Heat flow rate from port_a -> port_b | |
| SI.TemperatureDifference | dT (from Element1D) | port_a.T - port_b.T | |
| Modelica.Units.SI.MassFlowRate | m_flow | Mass flow rate of gas | |
| Modelica.Units.SI.SpecificHeatCapacity | c | Heat capacity of considered medium | |
| Modelica.Units.SI.Density | rho | Density of considered medium | |
| Modelica.Units.SI.ThermalConductivity | lambda | Thermal conductivity of considered medium | |
| Modelica.Units.SI.DynamicViscosity | eta | Dynamic viscosity of considered medium | |
| Modelica.Units.SI.ReynoldsNumber | Re | ||
| Modelica.Units.SI.Velocity | v | ||
| Modelica.Units.SI.NusseltNumber | Nu | ||
| Modelica.Units.SI.NusseltNumber | Nu_lam_1 | ||
| Modelica.Units.SI.NusseltNumber | Nu_lam_2 | ||
| Modelica.Units.SI.NusseltNumber | Nu_lam | ||
| Modelica.Units.SI.NusseltNumber | Nu_tur | ||
| Modelica.Units.SI.PrandtlNumber | Pr | ||
| Modelica.Units.SI.CoefficientOfHeatTransfer | alpha | ||
| Real | zeta | pressure loss coefficient |