p_out 1[atm]-pRef "Outlet pressure" T_in_sub 5[K] "Subcooled temperature at inlet" T_in T_sat-T_in_sub "Inlet temperature" u_in 0.2[m/s] "Inlet velocity" Q_w 12.5[kW] "Heat rate applied on solid" Re u_in*(d_out-d_in)/nu_l "Reynolds number at inlet"