Commit c09c13e1 authored by wenqing's avatar wenqing Committed by Dmitry Yu. Naumov
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[Doc] Added a description of GeneralWaterVapourLatentHeat

parent abd9d079
......@@ -18,6 +18,48 @@ namespace MaterialPropertyLib
{
class Phase;
/**
* \brief A general latent heat model of vaporisation of water.
*
* The model uses an equation for a general expression of the latent heat of
* vaporisation of water in the vicinity of and far away from the critical
* temperature, which was presented by Torquato and Stell in
* \cite torquato1982equation.
*
* Denoting the critical temperature as \f$T_c\f$, and introducing a
* dimensionless variable \f$\tau=(T_c-T)/T_c\f$ associated with temperature
* \f$T\f$, the equation is given by
*
* \f[
* L(\tau) = a_1 \tau^{\beta}+a_2 \tau^{\beta+\Delta}
* +a_4 \tau^{1-\alpha+\beta}
* +\sum_{n=1}^{M}(b_n \tau^n),\,\text{[kJ/kg]},
* \f]
* where the parameters of \f$b_n\f$ are obtained by the least square method
* by fitting the equation with the experiment data.
*
* In this model, the parameter set of \f$M=5\f$ is taken for a high accuracy.
* All parameters are given below:
* <ul>
* <li> \f$\alpha=1/8,\,\beta=1/3,\, \Delta=0.79-\beta\f$,
* <li> \f$a_1=1989.41582,\, a_2=11178.45586, a_4=26923.68994\f$,
* <li> \f$b_n:=\{-28989.28947, -19797.03646, 28403.32283,
* -30382.306422, 15210.380\}\f$.
* </ul>
*
* The critical temperature is 373.92 \f$^{\circ}\f$C.
*
* A comparison of this model with the model of
* MaterialPropertyLib::LinearWaterVapourLatentHeat
* is given in the following figure.
*
* \image{inline} html general_latent_heat_water_vapour.png ""
*
* Based on the comparison, a conclusion can be drawn such that
* the linear model can be applied for the applications with temperature
* below 400 K.
*
*/
class GeneralWaterVapourLatentHeat final : public Property
{
public:
......
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