modelAlphas_TwoPhase_5Region
Specify alphas | Two Phase | 5 Regions
Extends from TRANSFORM.HeatAndMassTransfer.ClosureRelations.HeatTransfer.Models.PartialTwoPhase.
Parameters
| Type | Name | Default | Description |
|---|---|---|---|
| Internal Interface | |||
| Integer | nHT (from PartialHeatTransfer) | 1 | Number of heat transfer segments |
| Integer | flagIdeal (from PartialHeatTransfer) | 0 | Flag for models to handle ideal heat transfer |
| Advanced | |||
| SI.ReynoldsNumber | Re_lam (from PartialHeatTransfer) | 2300 | Laminar transition Reynolds number |
| SI.ReynoldsNumber | Re_turb (from PartialHeatTransfer) | 4000 | Turbulent transition Reynolds number |
| Heat Transfer Model: | |||
| Units.NonDim | x_CHF | 0.9 | Steam quality corresponding to Critical Heat Flux |
Components
| Type | Name | Default | Description |
|---|---|---|---|
| Medium.ThermodynamicState[nHT] | states (from PartialHeatTransfer) | Thermodynamic state of fluid | |
| SI.Temperature[nHT] | Ts_wall (from PartialHeatTransfer) | Wall temperature | |
| SI.Temperature[nHT] | Ts_fluid (from PartialHeatTransfer) | Fluid temperature | |
| SI.Velocity[nHT] | vs (from PartialHeatTransfer) | Fluid Velocity | |
| SI.Diameter[nHT] | dimensions (from PartialHeatTransfer) | Characteristic dimension (e.g. hydraulic diameter) | |
| SI.Area[nHT] | crossAreas (from PartialHeatTransfer) | Cross sectional flow area | |
| SI.Length[nHT] | dlengths (from PartialHeatTransfer) | Characteristic length of heat transfer segment | |
| SI.Height[nHT] | roughnesses (from PartialHeatTransfer) | Average height of surface asperities | |
| SI.Temperature[nHT] | Ts_film (from PartialHeatTransfer) | 0.5*(Ts_wall + Ts_fluid) | Film temperature |
| Medium.ThermodynamicState[nHT] | states_film (from PartialHeatTransfer) | Medium.setState_pTX(Medium.pressure(states), Ts_film, Medium.X_default) | Film state |
| SI.MassFlowRate[nHT] | m_flows (from PartialHeatTransfer) | Fluid mass flow rate | |
| SI.Velocity[nHT] | vs_film (from PartialHeatTransfer) | Velocity with properties evaluated at film temperature | |
| SI.ReynoldsNumber[nHT] | Res (from PartialHeatTransfer) | Reynolds number | |
| SI.ReynoldsNumber[nHT] | Res_film (from PartialHeatTransfer) | Reynolds number with properties evaluated at film temperature | |
| SI.PrandtlNumber[nHT] | Prs (from PartialHeatTransfer) | Prandtl number | |
| SI.PrandtlNumber[nHT] | Prs_film (from PartialHeatTransfer) | Prandtl number with properties evaluated at film temperature | |
| SI.Length[nHT] | xs (from PartialHeatTransfer) | Position of local heat transfer calculation | |
| SI.CoefficientOfHeatTransfer[nHT] | alphas (from PartialHeatTransfer) | Coefficient of heat transfer | |
| SI.NusseltNumber[nHT] | Nus (from PartialHeatTransfer) | Nusselt number | |
| TRANSFORM.Media.BaseProperties2Phase | mediums (from PartialTwoPhase) | Bulk fluid properties | |
| TRANSFORM.Media.BaseProperties2Phase | mediums_film (from PartialTwoPhase) | Film fluid properties | |
| SI.CoefficientOfHeatTransfer | alpha_SinglePhaseLiquid_lam | mediums_film.lambda./dimensions.*Functions.SinglePhase.InternalFlow.Nu_Laminar_Local_Developed_Circular(Res_film, Prs_film, xs, dimensions, true) | Laminar coefficient of heat transfer - Liquid Phase |
| SI.CoefficientOfHeatTransfer | alpha_SinglePhaseLiquid_turb | mediums_film.lambda./dimensions.*Functions.SinglePhase.InternalFlow.Nu_Turbulent_Local_Developed(Res_film, Prs_film, xs, dimensions, roughnesses) | Turbulent coefficient of heat transfer - Liquid Phase |
| SI.CoefficientOfHeatTransfer | alpha_TwoPhaseSaturated | {mediums_film[i].lambda/dimensions[i]*Functions.TwoPhase.NucleateBoiling.alpha_Chen_TubeFlow(D = dimensions[i], G = m_flows[i]/crossAreas[i], x = mediums[i].x_abs, rho_fsat = mediums[i].rho_lsat, mu_fsat = mediums[i].mu_lsat, lambda_fsat = mediums[i].lambda_lsat, cp_fsat = mediums[i].cp_lsat, sigma = mediums[i].sigma, rho_gsat = mediums[i].rho_vsat, mu_gsat = mediums[i].mu_vsat, h_fg = mediums[i].h_lv, Delta_Tsat = Ts_wall[i] - mediums[i].sat.Tsat, Delta_psat = Medium.saturationPressure(Ts_wall[i]) - mediums[i].p) for i in 1:nHT} | Coefficient of heat transfer - Saturated Two Phase |
| SI.CoefficientOfHeatTransfer | alpha_SinglePhaseVapor_lam | mediums_film.lambda./dimensions.*Functions.SinglePhase.InternalFlow.Nu_Laminar_Local_Developed_Circular(Res_film, Prs_film, xs, dimensions, true) | Laminar coefficient of heat transfer - Vapor Phase |
| SI.CoefficientOfHeatTransfer | alpha_SinglePhaseVapor_turb | mediums_film.lambda./dimensions.*Functions.SinglePhase.InternalFlow.Nu_Turbulent_Local_Developed(Res_film, Prs_film, xs, dimensions, roughnesses) | Turbulent coefficient of heat transfer - Vapor Phase |
| SI.Length | L_char | dimensions | Characteristic dimension for calculation of Nu |
| SI.ThermalConductivity | lambda | mediums_film.lambda | Thermal conductivity for calculation of Nu |