Flux_parietal_Kommajosyula.h

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#ifndef Flux_parietal_Kommajosyula_included
#define Flux_parietal_Kommajosyula_included
 
#include <TRUSTTab.h>
#include <Flux_parietal_base.h>
#include <Correlation_base.h>
#include <Param.h>
 
/*! @brief Wall heat flux correlation for subcooled boiling using the Kommajosyula model.
 *
 *         Implements nucleation, bubble dynamics, sliding, and evaporation
 *         for subcooled boiling wall heat flux partitioning.
 *
 *         Reference: R. Kommajosyula, "Computational modeling of subcooled boiling flow",
 *         PhD thesis, MIT, 2020.
 */
class Flux_parietal_Kommajosyula : public Flux_parietal_base
{
  Declare_instanciable(Flux_parietal_Kommajosyula);
 
public:
  void qp(const input_t& input, output_t& output) const override;
  void completer() override;
 
  int calculates_bubble_nucleation_diameter() const override { return 1; }
  int needs_saturation() const override { return 1; }
  int T_at_wall() const override { return 1; }
 
protected:
  OWN_PTR(Correlation_base) correlation_monophasique_;
  double theta_;       //!< Contact angle on the surface [degrees]
  double molar_mass_;  //!< Molar mass [kg/mol]
 
  double Lambert_W_function(double x) const;
  double dx_Lambert_W_function(double x) const;
 
private:
  /*! @brief Results of nucleation parameter computation (page 42-56 Kommajosyula PhD). */
  struct NucleationParams
  {
    double D_d, dTp_D_d, dTl_D_d;       //!< Departure diameter and derivatives
    double D_lo, dTp_D_lo, dTl_D_lo;    //!< Liftoff diameter and derivatives
    double t_g, dTp_t_g, dTl_t_g;       //!< Growth time and derivatives
    double f_dep, dTp_f_dep, dTl_f_dep;  //!< Departure frequency and derivatives
    double N_sites, dTp_N_sites, dTl_N_sites, dTk_N_sites; //!< Site density and derivatives
  };
 
  /*! @brief Results of sliding area computation (page 66 Kommajosyula PhD). */
  struct SlidingAreaParams
  {
    double N_active, dTp_N_active, dTl_N_active, dTk_N_active; //!< Active site density and derivatives
    double S_sl, dTp_S_sl, dTl_S_sl, dTk_S_sl;                //!< Surface fraction and derivatives
  };
 
  /*! @brief Computes nucleation parameters: Jakob numbers, site density, diameters, frequencies.
   *
   * @param in Input data
   * @param n_l Liquid phase index
   * @param k Gas phase index
   * @param ind_sat Saturation index
   * @param Delta_T_sup Wall superheat [K]
   * @param Delta_T_sub Subcooling [K]
   * @param u_bulk Bulk velocity [m/s]
   */
  NucleationParams compute_nucleation_params(const input_t& in, int n_l, int k, int ind_sat,
                                             double Delta_T_sup, double Delta_T_sub, double u_bulk) const;
 
  /*! @brief Computes active nucleation site density, sliding area, and surface fraction.
   *
   * @param nuc Nucleation parameters from compute_nucleation_params
   * @param h_fc Single-phase heat transfer coefficient [W/m^2/K]
   * @param t_star Thermal boundary layer reformation time [s]
   */
  SlidingAreaParams compute_sliding_area(const NucleationParams& nuc, double h_fc, double t_star) const;
};
 
#endif