Start with your question
Why visitors arrive: You need dry-air density, viscosity, or conductivity at a temperature for CFD, similarity, or lab sizing.
Your question: What are air properties at my temperature and pressure, and which correlations are used?
You may also be asking
- How do I check Reynolds or Mach with these values?
- Where is this used in published work?
- What about pipe flow or heat-exchanger sizing?
Where to go next
- Dimensionless groups reference — Similarity checks after you have properties
- Dimensional analysis module — Pi-group scaling theory
- CFD–experiment validation article — Pairing simulation BCs with data
- All calculators — Other tools on the platform
Air properties calculator
Lucas Rey — aerothermal engineer · ORCID · About · Publications
Interactive utility for the thermophysical characterization of dry air. Computes density, viscosity, thermal conductivity, specific heats, and Prandtl number from validated aerothermal correlations — part of the engineering calculators on the knowledge platform.
Air properties calculator
Compute temperature-dependent thermophysical properties of dry air. Optionally include pressure to obtain density, thermal diffusivity and kinematic viscosity.
Correlations & valid range
The calculator evaluates dry-air properties using piecewise correlations suited to aerothermal and gas-turbine temperature bands. Density follows the ideal-gas law with a temperature-dependent gas constant treatment appropriate for the stated range; viscosity and thermal conductivity use standard engineering correlations for air; specific heats and Prandtl number are derived consistently from those inputs.
- Temperature range: 200 K — 2000 K (dry air, near-atmospheric applications as used in rig sizing)
- Assumption: Dry air — moisture effects are not modelled; humid flows require separate property treatment
- Outputs: Density, dynamic viscosity, thermal conductivity, specific heat at constant pressure, and Prandtl number in SI units
- Traceability: Use documented inputs when coupling to CFD–experiment validation or experimental measurement workflows — similarity arguments fail when property tables are inconsistent between solver and experiment
Typical uses on this site
Reynolds & Prandtl sizing
Estimate Re and Pr for channel or probe similarity checks before running the viscous flow problem sets or scaling a wind-tunnel model.
Boundary conditions
Supply consistent thermophysical inputs when documenting CFD boundary conditions — see the CFD–experiment validation article for how properties enter validation statements.
Facility checks
Cross-check rig operating points against published campaigns on projects and turbomachinery deterioration research.
Related on this site
- Calculators hub — index of interactive engineering tools
- Fluid mechanics curriculum — Pi groups, viscous flow, and similarity modules
- Viscous flow problems — pipe-flow exercises that use thermophysical inputs
- Dimensional analysis — Pi groups and similarity scaling
- Experimental aerothermal measurement — methods article on traceability and facility transfer
- CFD–experiment validation — closing the loop between simulation and measurement
- Instrumentation & measurement — experimental methods theme
- Publications — research using aerothermal property correlations
- Engineering hub — full platform index
Available for technically rigorous R&D and institutional collaboration.
Part of
This page sits within the broader knowledge structure on lucasrey.com:
- Engineering - Central knowledge platform - tools, curriculum, notes, and research assets.
- Tools - Interactive calculators and engineering utilities.
Connected work
Related content from the same research and engineering work:
- Calculators hub
- Viscous flow problems
- Dimensional analysis
- Curriculum index
- Air properties calculator - Referenced from HPT transient thermography
- Air properties calculator - Referenced from Turbomachinery deterioration
- Air properties calculator - Referenced from Thermal & additive design
Part of Engineering
This page is part of the engineering knowledge platform on lucasrey.com.
- Engineering hub - Full knowledge platform index
- Engineering calculators - Air properties (live); probe uncertainty and related tools (planned).
- Engineering calculators - Air properties (live); probe uncertainty and related tools (planned).
- Fluid mechanics curriculum - Index and learning path across modules.
- Dimensional analysis - Pi groups, similarity, and model testing.
- Viscous flow - problems - Worked and practice problems for viscous flow.
- Instrumentation & measurement - Pneumatic probing, calibration transfer, and uncertainty propagation.
- Experimental aerothermal measurement - Methods article on traceability, similarity, and facility transfer - links instrumentation, curriculum, and tools.
- CFD–experiment validation - Methods article on closing the loop between RANS simulations and transient aerothermal measurements.
- Publications - Peer-reviewed papers and manuscripts in preparation - research pillar with thematic hubs, project links, and structured metadata.
- Calculators hub
- Viscous flow problems
- Dimensional analysis
Engineering knowledge platform
More tools, curriculum, notes, and research from the same body of work:
- Engineering - Central knowledge platform - tools, curriculum, notes, research, and applied engineering work.