Class that implements steady state heat transfer between gas and pipeline surroundings. More...

#include <steadystate.hpp>

Inheritance diagram for SteadyStateHeatTransfer:

Public Member Functions
	SteadyStateHeatTransfer (const double diameter, const PipeWall &pipeWall, const double burialDepth, const BurialMedium &burialMedium, const AmbientFluid &ambientFluid)
	Construct from full description of pipeline. More...

	SteadyStateHeatTransfer (const double diameter=1.0, const double burialDepth=1.0)
	Constructor with default pipe wall, burial medium and ambient medium. More...

virtual HeatTransferState	evaluate (const HeatTransferState &current, const double timeStep, const double ambientTemperature, const double gasPressure, const double gasTemperature, const double gasReynoldsNumber, const double gasHeatCapacity, const double gasViscosity) const override
	Evaluate 1d radial steady state heat transfer. More...

HeatTransferState	evaluateInternal (const double ambientTemperature, const double gasPressure, const double gasTemperature, const double gasReynoldsNumber, const double gasHeatCapacity, const double gasViscosity) const
	Internal method used for evaluating steady state heat transfer. More...

double	calculateHeatTransferCoefficient (const double gasPressure, const double gasReynoldsNumber, const double gasHeatCapacityConstantPressure, const double gasViscosity) const
	Calculate the total heat transfer coefficient U. More...

double	getOverallHeatTransferCoefficient () const

double	getOverallThermalResistance () const

Public Member Functions inherited from RadialHeatTransfer
	RadialHeatTransfer (const double diameter, const PipeWall &pipeWall, const double burialDepth, const BurialMedium &burialMedium, const AmbientFluid &ambientFluid)
	Constructor that sets up the discretization of the pipe surroundings. More...

double	calculateOuterFilmCoefficient () const
	Calculate the outer film coefficient. Basically a wrapper around utils::calcOuterWallFilmCoefficient(const double, const AmbientFluid&) using the proper arguments. More...

virtual arma::uword	size () const
	The number of discretization elements.

virtual HeatTransferState	makeState (const double heatFlux) const override
	Make instance of HeatTransferState from heat flux. Override. More...

virtual HeatTransferState	makeState (const double heatFlux, const double gasTemperature, const double ambientTemperature) const override
	Make instance of HeatTransferState from heat flux. Override. More...

Public Member Functions inherited from HeatTransferBase
virtual	~HeatTransferBase ()

Private Attributes
double	m_overallHeatTransferCoefficient

double	m_overallThermalResistance

Additional Inherited Members
Protected Attributes inherited from RadialHeatTransfer
double	m_diameter
	Pipe inner diameter [m].

double	m_burialDepth
	Distance from top of pipe to top of burial medium [m].

BurialMedium	m_burialMedium

AmbientFluid	m_ambientFluid
	Description of the fluid surrounding the pipeline.

arma::vec	m_width
	Width of each discretization shell [m].

arma::vec	m_conductivity
	Thermal conductivity of each discretization shell [W/(m K)].

arma::vec	m_density
	Density of each discretization shell [kg/m3].

arma::vec	m_heatCapacity
	Heat capacity of each discretization shell ( \(c_p\)) [J/(kg K)].

arma::uvec	m_isBurialLayer

arma::vec	m_crossSection
	Area/cross-section of each shell [m2].

arma::vec	m_ri
	Inner radius [m].

arma::vec	m_ro
	Outer radius [m].

Detailed Description

Class that implements steady state heat transfer between gas and pipeline surroundings.

This is well documented in Jan Fredrik Helgaker's PhD thesis.

Constructor & Destructor Documentation

◆ SteadyStateHeatTransfer() [1/2]

SteadyStateHeatTransfer::SteadyStateHeatTransfer	(	const double	diameter,
		const PipeWall &	pipeWall,
		const double	burialDepth,
		const BurialMedium &	burialMedium,
		const AmbientFluid &	ambientFluid
	)

Construct from full description of pipeline.

Parameters

diameter	Inner diameter [m]
pipeWall	PipeWall instance
burialDepth	Distance from top of pipe to top of burial medium [m]
burialMedium	BurialMedium instace
ambientFluid	AmbientFluid instance

◆ SteadyStateHeatTransfer() [2/2]

SteadyStateHeatTransfer::SteadyStateHeatTransfer	(	const double	diameter = `1.0`,
		const double	burialDepth = `1.0`
	)

Constructor with default pipe wall, burial medium and ambient medium.

Parameters

diameter	Inner diameter [m]
burialDepth	Distance from top of pipe to top of burial medium [m]

Member Function Documentation

◆ calculateHeatTransferCoefficient()

double SteadyStateHeatTransfer::calculateHeatTransferCoefficient	(	const double	gasPressure,
		const double	gasReynoldsNumber,
		const double	gasHeatCapacityConstantPressure,
		const double	gasViscosity
	)		const

Calculate the total heat transfer coefficient U.

This is exposed for testing purposes. We typically use pointers anyway, so this is not accessible without casting to SteadyStateHeatTransfer.

Parameters

gasPressure	Gas pressure [Pa]
gasReynoldsNumber	Gas Reynolds number [-]
gasHeatCapacityConstantPressure	Gas heat capacity ( \(c_p\)) [J/(kg K)]
gasViscosity	Gas dynamic viscosity [Pa s] = [kg/m*s]

Returns: Total heat transfer coefficient U [W/(m2 K)]

◆ evaluate()

virtual HeatTransferState SteadyStateHeatTransfer::evaluate	(	const HeatTransferState &	current,
		const double	timeStep,
		const double	ambientTemperature,
		const double	gasPressure,
		const double	gasTemperature,
		const double	gasReynoldsNumber,
		const double	gasHeatCapacity,
		const double	gasViscosity
	)		const

overridevirtual

Evaluate 1d radial steady state heat transfer.

Operates on a HeatTransferState and returns a new HeatTransferState, but does not require discretization temperature.

Parameters

current	Current HeatTransferState
timeStep	Time step [s]
ambientTemperature	Ambient temperature [K]
gasPressure	Gas pressure [Pa]
gasTemperature	Gas temperature [K]
gasReynoldsNumber	Reynolds number of gas [-]
gasHeatCapacity	Gas heat capacity ( \(c_p\)) [J/(kg K)]
gasViscosity	Gas dynamic viscosity [Pa s] = [kg/m*s]

Returns: HeatTransferState with new heat flux.

Implements HeatTransferBase.

◆ evaluateInternal()

HeatTransferState SteadyStateHeatTransfer::evaluateInternal	(	const double	ambientTemperature,
		const double	gasPressure,
		const double	gasTemperature,
		const double	gasReynoldsNumber,
		const double	gasHeatCapacity,
		const double	gasViscosity
	)		const

Internal method used for evaluating steady state heat transfer.

This is exposed for testing purposes. We typically use pointers anyway, so this is not accessible without casting to SteadyStateHeatTransfer.

Parameters

ambientTemperature	Ambient temperature [K]
gasPressure	Gas pressure [Pa]
gasTemperature	Gas temperature [K]
gasReynoldsNumber	Reynolds number of gas [-]
gasHeatCapacity	Gas heat capacity ( \(c_p\)) [J/(kg K)]
gasViscosity	Gas dynamic viscosity [Pa s] = [kg/m*s]

Returns: HeatTransferState with new heat flux.

◆ getOverallHeatTransferCoefficient()

double SteadyStateHeatTransfer::getOverallHeatTransferCoefficient ( ) const

inline

Get the total heat transfer coefficient of all radial discretization shells. Does not include the inner film coefficient.

◆ getOverallThermalResistance()

double SteadyStateHeatTransfer::getOverallThermalResistance ( ) const

inline

Get the total thermal resistance of all radial discretization shells. Does not include the inner film coefficient.

Member Data Documentation

◆ m_overallHeatTransferCoefficient

double SteadyStateHeatTransfer::m_overallHeatTransferCoefficient

private

Total heat transfer coefficient of all radial discretization shells. Does not include the inner film coefficient.

◆ m_overallThermalResistance

double SteadyStateHeatTransfer::m_overallThermalResistance

private

Total thermal resistance of all radial discretization shells. Does not include the inner film coefficient.

The documentation for this class was generated from the following file:

D:/Code/transient-pipeline-flow-gh-pages/src/heattransfer/steadystate.hpp

Public Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ SteadyStateHeatTransfer() [1/2]

◆ SteadyStateHeatTransfer() [2/2]

Member Function Documentation

◆ calculateHeatTransferCoefficient()

◆ evaluate()

◆ evaluateInternal()

◆ getOverallHeatTransferCoefficient()

◆ getOverallThermalResistance()

Member Data Documentation

◆ m_overallHeatTransferCoefficient

◆ m_overallThermalResistance