utils.hpp

#pragma once
 
#include <armadillo>
 
class AmbientFluid;
 
namespace utils {
 
    double calcGasThermalConductivity(const double pressure);
 
    double calcOuterWallFilmCoefficient(
            const double diameter,
            const AmbientFluid& fluid
            );
 
    double calcOuterWallFilmCoefficient(
            const double diameter,
            const double heatCapacityConstantPressure = 4200, // [J/kg K]
            const double viscosity = 1.05/1000.0, // [Pa s] = [kg/m*s]
            const double thermalConductivity = 0.57, // [W/m K]
            const double density = 1020, // [kg/m3]
            const double velocity = 0.1 // [m/s]
            );
 
    double calcInnerWallFilmCoefficient(
            const double diameter,
            const double fluidPressure,
            const double fluidReynoldsNumber,
            const double fluidHeatCapacityConstantPressure,
            const double fluidViscosity);
 
    double calcEquivalentBurialLayerWidth(
            const double innerDiameter,
            const double wallThickness,
            const double burialDepth,
            const double burialMediumConductivity = 2.0);
 
    double calcEquivalentBurialLayerRadius(
            const double innerDiameter,
            const double wallThickness,
            const double burialDepth,
            const double burialMediumConductivity = 2.0);
 
    arma::vec calcLogSpacedShellWidths(
            const double innerRadius,
            const double outerRadius,
            const arma::uword nShells = 10);
 
    arma::vec calcEquivalentBurialLayerWidths(
            const double innerDiameter,
            const double wallThickness,
            const double burialDepth,
            const double burialMediumConductivity = 2.0,
            const arma::uword nShells = 10);
}