Scope and Subject Category Guide logo

Subject Category Browse

Category Scope

34 Fluid Mechanics and Thermodynamics

Includes fluid dynamics and kinematics and all forms of heat transfer; boundary layer flow; hydrodynamics; hydraulics; fluidics; mass transfer and ablation cooling. For related information see also 02 Aerodynamics.


Fluid Mechanics – The experimental and mathematical study of the mechanical properties of gases and liquids at rest and in motion. NASA Thesaurus, Washington, DC: National Aeronautics and Space Administration.

Heat Transfer – The transfer or exchange of heat by radiation, conduction, or convection within a substance and between the substance and its surroundings. NASA Thesaurus, Washington, DC: National Aeronautics and Space Administration. Dictionary of Technical Terms for Aerospace Use. Wm. H. Allen, ed., 1965. NASA SP-7.

Thermodynamics – Study and application of principles describing the relation of heat transfer to various forms of energy, and the behaviors of physical systems where temperature is a significant feature. NASA Thesaurus, Washington, DC: National Aeronautics and Space Administration.

NASA Interest

Exhaustive Interest : Theories, research, and studies on the forces, flow, mechanical properties and heat transfer of liquids or gases having specific relevance to aerospace interests or under conditions encountered in aircraft, spacecraft, launch vehicles, space vehicles, propulsion systems, or support facilities. Theory, research, and development on heat transfer of relevance also to the thermodynamic properties of elements, compounds, materials, and substances found in aerospace science and technology. (Those subjects concerned with astronomical, solar, and stellar phenomena and their interactions should be included in 89 Astronomy; or 90 Astrophysics.)

Selective Interest : Research developments, and studies of liquids and gases and heat transfer of potential interest for aerospace applications or under unusual or extreme conditions.

Negative Interest : Heat transfer and flow of liquids and gases over wires, through channels, ducts, and pipes related to normal powerplant, reservoir, irrigation, and residential-business use unless related to remote sensing, Earth resources, or for other potential aerospace application.


Input Subjects of Specific Interest

  • ablation
  • ablation cooling
  • atomizers
  • boiling
  • Boltzmann transport theory
  • boundary layer flow (general)
  • cavitation
  • compressible flow (general)
  • computational fluid dynamics
  • convection
  • enthalpy
  • entropy
  • equations of state
  • flow (general)
  • flow characteristics
  • flow equations
  • flow measurement
  • flow visualization (general applications)
  • flow with heat addition
  • fluerics
  • fluid dynamics
  • fluid flow
  • fluid forces
  • fluid heat transfer
  • fluid kinematics
  • fluid mechanics
  • fluidics
  • free energy
  • gas dynamics
  • gas flow
  • gas forces
  • gas heat transfer
  • gas mechanics
  • gaseous film cooling
  • heat exchangers (aerospace applications)
  • heat pipes (aerospace applications)
  • heat shields (aerospace applications)
  • heat sinks (aerospace applications)
  • heat transfer
  • hydraulics
  • hydrodynamics
  • hydrostatics
  • incompressible flow
  • induction heating
  • internal flow in ducts (applications)
  • internal flow in turbomachinery (applications)
  • inviscid flow
  • laminar flow (general)
  • liquid settling
  • liquid sloshing
  • mass transfer
  • mixing of gases
  • mixing of liquids
  • multiphase flow
  • Navier-Stokes equations
  • pneumatics
  • radiative transfer
  • radiators (aerospace applications)
  • rheology
  • shear flow
  • shear thinning
  • shock waves
  • skin friction
  • sprays
  • temperature-pressure phenomena
  • thermal radiation
  • thermodynamic cycles
  • thermodynamic properties
  • thermodynamics
  • transitional flow (general)
  • transpiration cooling
  • turbulence models
  • turbulent flow (general)
  • unsteady flow (general)
  • viscous flow
  • vortices (general)