Two-Phase Flow

The Most Comprehensive Two-Phase Thermohydraulic Analyzer Available

CRTech's fluid modeling module was designed right from the start to handle the peculiarities of two-phase flows along with the complexities of transitioning between single-phase and two-phase. In fact, its development was initiated specifically to avoid the shortcomings of single-phase analyzers that had been retrofitted to adapt to two-phase problems.

Combined with the heat transfer capabilities that CRTech's software provides and the CAD-based interface of FloCAD® (a module of Thermal Desktop®), and the unique capabilities such as parametric analyses, optimization, calibration, and statistical design, CRTech's two-phase flow software is truly in a class by itself.

Download the Two-Phase Brochure

Recorded Videos

Two-Phase Flow CapabilitiesDepliction of Flow Regime Mapping and Slip Flow

  • Complete thermodynamics: phases appear and disappear as conditions warrant
  • Two-phase heat transfer correlations built-in or user-defined
  • Built-in options to support pool boiling
  • Two-phase pressure drop correlations built-in or user-defined
  • Automatic flow regime mapping
  • From quasi-steady homogeneous equilibrium to fully transient two-fluid modeling
  • Optional slip flow modeling (separate phasic momentum equations)
  • Optional nonequilibrium transients
    • Complete separation of phases
    • Separate phasic energy and mass equations
  • Metastable throat states in orifices and cavitating venturis
  • Flat-front modeling methods (minimal mixing of phases) for purging, priming
  • Capillary modeling tools for static or vaporizing wicks
  • Tracking of liquid surfaces in complex tanks and vessels

Two-Phase Mixture Capabilities

  • Mixtures of up to 26 liquids and/or gases
  • Optional condensible/volatile component in mixture, including effects such as diffusion-limited condensation
  • Optional dissolution of any number of gaseous solutes into any number of liquid solvents, including homogeneous nucleation modelsCondensing in the Presence of Noncondensible Gas

Sample Industries

  • Automotive (climate control, transmissions, fuel/air)
  • Electronics (liquid cooling including immersion cooling, condensation on surfaces)
  • Aerospace (thermal management, cryogenics, ECLSS)
  • Aircraft (air conditioning, fuel/air including flow within multiple fuel tank bays)
  • Energy Systems (BWR, Rankine cycle power plants)
  • Petrochemical and Pharmaceutical (gas transport, steam injection, two-phase processes)
  • Fire Safety (liquid retardant delivery)

Sample Applications

  • Condenser, evaporator, and boiler sizing and simulation
  • Vapor compression and Rankine cycle analyses, including dynamic responses
  • Throttling processes, including Joule-Thomson cooling with two-phase outlets
  • Loop heat pipe (LHP) and capillary pumped loop (CPL) design and simulation
  • Two-phase thermosyphon simulation, whether loops or counterflow
  • Integrated analysis of cryogenic systems and dewars, thermodynamic vents and vapor-cooled shields, anti-geyser lines, pressurant systems, thermally stratified tanks, and turbomachinery cool-down
  • Gas storage and distribution systems including the effects of condensation
  • Fuel/air systems, including partially filled complex vessels
  • Waterhammer and other fast transient effects including flashing, column separation, chugging and other oscillations in two-phase lines
  • Pressurized fire retardant delivery systems
  • Condensing air heat exchangers and wet air psychrometrics, including condensation on electronics
  • Fuel cells and support equipment

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