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October 24, 2005, 08:50 |
Water vapour condensation in CFX-5.7.1
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#1 |
Guest
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Hi
I'm trying to simulate water vapour condensation on surface. I've modified boiling_water.ccl in /etc/model-templates. But condensation seems not start. I've tried various Nu, boundary conditions (wall temperature) etc. with no success. Boiling itself is quite good calculated. Has anybody some experience on this? I am using CFX-5.7.1. Any suggestion will be appreciated. Below is an example of the model. Best regards. NuL = 6 NuV = 2000 Pref = 1.014 [bar] Tsat = 100. [C] Tdown = Tsat-20 [C] DOMAIN: boiling device Coord Frame = Coord 0 Domain Type = Fluid Fluids List = Water at 100 C,Water Vapour at 100 C Location = Assembly BOUNDARY: OUT Boundary Type = OUTLET Location = OUT BOUNDARY CONDITIONS: FLOW REGIME: Option = Subsonic END MASS AND MOMENTUM: Option = Average Static Pressure Relative Pressure = Pref END PRESSURE AVERAGING: Option = Average Over Whole Outlet END END END BOUNDARY: SYM Boundary Type = SYMMETRY Location = SYM1,SYM2 END BOUNDARY: UP Boundary Type = WALL Location = WALLU BOUNDARY CONDITIONS: HEAT TRANSFER: Option = Fluid Dependent END END FLUID: Water Vapour at 100 C BOUNDARY CONDITIONS: HEAT TRANSFER: Option = Adiabatic END WALL INFLUENCE ON FLOW: Option = No Slip END END END FLUID: Water at 100 C BOUNDARY CONDITIONS: HEAT TRANSFER: Option = Adiabatic END WALL INFLUENCE ON FLOW: Option = No Slip END END END WALL CONTACT MODEL: Option = Use Volume Fraction END END DOMAIN MODELS: BUOYANCY MODEL: Option = Non Buoyant END DOMAIN MOTION: Option = Stationary END REFERENCE PRESSURE: Reference Pressure = Pref END END FLUID MODELS: COMBUSTION MODEL: Option = None END HEAT TRANSFER MODEL: Homogeneous Model = False Option = Fluid Dependent END THERMAL RADIATION MODEL: Option = None END TURBULENCE MODEL: Homogeneous Model = False Option = Laminar END END FLUID PAIR: Water Vapour at 100 C | Water at 100 C INTERPHASE HEAT TRANSFER: Option = Two Resistance FLUID1 INTERPHASE HEAT TRANSFER: Fluid1 Nusselt Number = NuV Option = Nusselt Number END FLUID2 INTERPHASE HEAT TRANSFER: Fluid2 Nusselt Number = NuL Option = Nusselt Number END END INTERPHASE TRANSFER MODEL: Option = Particle Model END MASS TRANSFER: Option = Phase Change PHASE CHANGE MODEL: Option = Thermal Phase Change Saturation Temperature = Tsat END END MOMENTUM TRANSFER: DRAG FORCE: Option = Schiller Naumann END LIFT FORCE: Option = None END VIRTUAL MASS FORCE: Option = None END WALL LUBRICATION FORCE: Option = None END END SURFACE TENSION MODEL: Option = None END END FLUID: Water Vapour at 100 C FLUID MODELS: HEAT TRANSFER MODEL: Option = Thermal Energy END MORPHOLOGY: Option = Continuous Fluid END END END FLUID: Water at 100 C FLUID MODELS: HEAT TRANSFER MODEL: Option = Thermal Energy END MORPHOLOGY: Mean Diameter = 1 [mm] Option = Dispersed Fluid END END END MULTIPHASE MODELS: Homogeneous Model = Off FREE SURFACE MODEL: Option = Standard END END BOUNDARY: DOWN Boundary Type = WALL Location = WALLD BOUNDARY CONDITIONS: HEAT TRANSFER: Option = Fluid Dependent END END FLUID: Water Vapour at 100 C BOUNDARY CONDITIONS: HEAT TRANSFER: Fixed Temperature = Tdown Option = Fixed Temperature END WALL INFLUENCE ON FLOW: Option = No Slip END END END FLUID: Water at 100 C BOUNDARY CONDITIONS: HEAT TRANSFER: Fixed Temperature = Tdown Option = Fixed Temperature END WALL INFLUENCE ON FLOW: Option = No Slip END END END WALL CONTACT MODEL: Option = Use Volume Fraction END END BOUNDARY: IN Boundary Type = INLET Location = IN BOUNDARY CONDITIONS: FLOW DIRECTION: Option = Normal to Boundary Condition END FLOW REGIME: Option = Subsonic END HEAT TRANSFER: Option = Fluid Dependent END MASS AND MOMENTUM: Option = Total Pressure Relative Pressure = 1.001*Pref END END FLUID: Water Vapour at 100 C BOUNDARY CONDITIONS: HEAT TRANSFER: Option = Static Temperature Static Temperature = Tsat END VOLUME FRACTION: Option = Value Volume Fraction = 1 END END END FLUID: Water at 100 C BOUNDARY CONDITIONS: HEAT TRANSFER: Option = Static Temperature Static Temperature = Tsat END VOLUME FRACTION: Option = Value Volume Fraction = 0 END END END END ENDEND |
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November 27, 2005, 07:15 |
Re: Water vapour condensation in CFX-5.7.1
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#2 |
Guest
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hello I am interesting in the condensation in the presence of non condensable gases...I want to use CFX in the modeling of the condenser, any help or cooperation is welcome. I am not a professional in the field of CFX or Ansys. thanks
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