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"cores": 2, "slots_each": 19 }, "minor_loss_coefficient_assumed": 1.0, "ice_1kg_ideal_duration_s": 5194.856974660968 } }, { "entry_K": 2.0, "warm": { "mass_flow_kgs": 0.0032012996032584305, "outlet_K": 293.15, "air_cold_heat_W": 0.0, "wall_integrated_heat_W": 0.0, "energy_residual_W": 0.0, "friction_pressure_drop_Pa": 41.45895403331562, "max_hydraulic_Re": 488.790005288671, "active_flow_area_m2": 0.000722, "slots_total": 38, "wall_K": 293.15, "ny": 32, "nx": 100, "model_validity": "LAMINAR_SCREEN", "core_minor_pressure_drop_Pa": 16.327101167566997, "other_pressure_terms_Pa": 2.4198606178466306, "available_ram_head_Pa": 60.20591581873078, "pressure_balance_residual_Pa": -1.5347723092418164e-12, "geometry": { "gap_m": 0.001, "fin_m": 0.0002, "width_m": 0.023, "height_m": 0.019, "wall_m": 0.0005, "length_m": 0.05, "cores": 2, "slots_each": 19 }, "minor_loss_coefficient_assumed": 2.0, "ice_1kg_ideal_duration_s": null }, "cold": { "mass_flow_kgs": 0.0033495524795043013, "outlet_K": 275.65750234852965, "air_cold_heat_W": 58.86595666297525, "wall_integrated_heat_W": 58.86595666297685, "energy_residual_W": 1.5987211554602254e-12, "friction_pressure_drop_Pa": 40.25480555888833, "max_hydraulic_Re": 536.5574041729108, "active_flow_area_m2": 0.000722, "slots_total": 38, "wall_K": 273.15, "ny": 32, "nx": 100, "model_validity": "LAMINAR_SCREEN", "core_minor_pressure_drop_Pa": 17.341051858608296, "other_pressure_terms_Pa": 2.610058401185321, "available_ram_head_Pa": 60.20591581873078, "pressure_balance_residual_Pa": -4.8835602228791686e-11, "geometry": { "gap_m": 0.001, "fin_m": 0.0002, "width_m": 0.023, "height_m": 0.019, "wall_m": 0.0005, "length_m": 0.05, "cores": 2, "slots_each": 19 }, "minor_loss_coefficient_assumed": 2.0, "ice_1kg_ideal_duration_s": 5666.263132521075 } } ], "physics": [ "mu(T) follows the Sutherland formula with mu0=1.716e-5 Pa s, T0=273 K, S=111 K.", "cp=gamma R/(gamma-1). k(T) uses Sutherland form with k0=.0241 W/(m K), T0=273 K, S=194 K.", "cp G(y) dT/dx = k d2T/dy2, cell-centred finite volume with isothermal walls.", "Pressure loss uses the rectangular-duct Poiseuille conductance series, integrated with cooling density and viscosity; its wide-slot limit is 12 mu L U / gap^2.", "Exactly the same slot geometry sets heat-transfer area and viscous resistance." ], "sources": [ "https://doc.comsol.com/6.4/doc/com.comsol.help.cfd/cfd_ug_fluidflow_high_mach.08.46.html", "https://www.grc.nasa.gov/WWW/winddocs/user/keywords/viscosity.html" ], "open_bypass_same_head_mass_flow_kgs": 0.015968007520434837, "limits": [ "Isothermal metal surfaces are an optimistic heat-transfer bound. Fin conduction, bath plumbing, pump power, entrance development, humidity, frost and conjugate wall temperatures require later measurement.", "Parabolic mass-flux profile is prescribed; variable cross-channel viscosity and transverse acceleration are not a full 2D momentum solve.", "A positive cold-versus-warm matched-core difference does not mean more flow than an open bypass, net propulsion or net energy generation.", "Laminar predictions are withheld as design evidence for rows marked transition/turbulence unresolved. These results do not scale directly to a 400 km/h vehicle.", "The entry/exit minor loss is swept; no assumed independent UA is supplied." ] }