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 and quasi-stagnant convection
  • 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, propulsion, 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)

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
flow regimes

Introduction to Two-phase Flow

September 24, 2-3pm MDT

This webinar introduces basic concepts in two-phase flow modeling including quality, void fraction, flow regimes, slip flow, pressure drops and accelerations, and heat transfer.

No knowledge of CRTech software is required. However, references to the corresponding FloCAD features will be made to assist users of that product.

Click here to register

Introductory FloCAD Training

Class times: September 5, 10, and 12, 2019, 9:00 am to 12:00 pm MDT daily
Cost: no charge (attendees must have an active support contract)

CRTech will be hosting introductory training for FloCAD (Flow Modeling in Thermal Desktop). This is our standard FloCAD class previously hosted in a classroom environment and now restructured for an online teaching environment.

The class will introduce single-phase fluid modeling concepts and how to build fluid models within the FloCAD work environment. Topics covered include an introduction to fluid modeling components, geometric versus non-geometric modeling options, working with FloCAD Pipes, solution control, and an introduction to path and pipe libraries.

The class will be broken into three two- to three-hour sessions held over a 3 day period. The format will be online lecture and demonstration with opportunities to ask questions. Hands-on lab work will be provided to students to work on after each session. To gain the most from this class, students are encouraged to attend all three sessions.

Prerequisites: Attendees must have basic working knowledge of Thermal Desktop as many of its base features will not be covered in this class but their usage is required for FloCAD.

Eligibility Requirement: This class is a service to our customers. All attendees must have an active support contract. If you are unsure of your support status, please contact CRTech.

Click here to register