Technical Terms in Fluid Mechanics
Some commonly used technical terms in fluid mechanics.
Acoustic theory
 Relating to mathematical description of sound waves
 Acoustical Engineering  Explains to architects and engineers the basic science of acoustics. Introduction to sound, decibel and propagation of sound. Calculate decibels, reduce noise in HVAC systems, sound levels ..
Aerodynamics
 Aerodynamics is the study of the flow of gases.
 The Ideal Gas Law  For a perfect or ideal gas the change in density is directly related to the change in temperature and pressure as expressed in the Ideal Gas Law.
Aeronautics
 Aeronautics is the mathematics and mechanics of flying objects, in particular airplanes.
Bernoulli's equation
 The Bernoulli's Equation describes the behavior of moving fluids along a streamline.
Boundary layer
 The boundary layer is the layer of fluid in the immediate vicinity of a bounding surface.
 Dynamic, Absolute and Kinematic Viscosity  An introduction to dynamic, absolute and kinematic viscosity and how to convert between CentiStokes (cSt), CentiPoises (cP), Saybolt Universal Seconds (SSU) and degree Engler.
Cavitation
 Cavitation and NPSH  An introduction to cavitation and Net Positive Suction Head, NPSH.
 Cavitation in Control Valves  Control valves and cavitation, application ratio and multi stage control valves.
Compressible flow
 In a compressible flow the compressibility of the fluid must be taken into account.
 The Ideal Gas Law  For a perfect or ideal gas the change in density is directly related to the change in temperature and pressure as expressed in the Ideal Gas Law.
 Properties of Gas Mixtures  Special care must be taken for gas mixtures when using the ideal gas law, calculating the mass, the individual gas constant or the density.
 The Individual and Universal Gas Constant  The Individual and Universal Gas Constant is common in fluid mechanics and thermodynamics.
Coanda effect
 The Coanda Effect is the tendency of a stream of fluid to stay attached to a convex surface, rather than follow a straight line in its original direction.
Conservation laws
 The conservation laws states that particular measurable properties of an isolated physical system does not change as the system evolves.
 conservation of energy (including mass)
 Fluid Mechanics and Conservation of Mass  The law of conservation of mass states that mass can neither be created or destroyed.
DarcyWeisbach Equation
 Pressure Loss and Head Loss due to Friction in Ducts and Tubes  Major loss  head loss or pressure loss  due to friction in pipes and ducts.
Density
 Density, Specific Weight and Specific Gravity  An introduction and definition of density, specific weight and specific gravity. Formulas with examples.
Euler equations
 In fluid dynamics, the Euler equations govern the motion of a compressible, inviscid fluid. They correspond to the NavierStokes equations with zero viscosity, although they are usually written in the form shown here because this emphasizes the fact that they directly represent conservation of mass, momentum, and energy.
Euler Number
 The Euler Number  An introduction to and a definition of the Euler Number.
Flow Coefficient  C_{v}  K_{v}
 Flow Coefficient C_{v} and Flow Factor K_{v}  The difference between the flow coefficient C_{v} and K_{v}.
Flow measurement
 Fluid Flowmeters  Tools and information regarding fluid flowmeters.
 Fluid Flow Measurement  An introduction to different types of fluid flowmeters  Orifices, Venturies, Nozzles, Rotameters, Pitot Tubes, Calorimetrics, Turbine, Vortex, Electromagnetic, Doppler, Ultrasonic, Thermal, Coriolis.
Fluids
 The Bernoulli Equation  A statement of the conservation of energy in a form useful for solving problems involving fluids. For a nonviscous, incompressible fluid in steady flow, the sum of pressure, potential and kinetic energies per unit volume is constant at any point.
 Equations in Fluid Mechanics  Continuity, Euler, Bernoulli, Dynamic and Total Pressure
 Laminar, Transitional or Turbulent Flow  It is important to know if the fluid flow is laminar, transitional or turbulent when calculating heat transfer or pressure and head loss.
Froude number
 The Froude Number  An introduction to and a definition of the Froude Number.
Gas
 The Ideal Gas Law  For a perfect or ideal gas the change in density is directly related to the change in temperature and pressure as expressed in the Ideal Gas Law.
 Properties of Gas Mixtures  Special care must be taken for gas mixtures when using the ideal gas law, calculating the mass, the individual gas constant or the density.
 The Individual and Universal Gas Constant  The Individual and Universal Gas Constant is common in fluid mechanics and thermodynamics.
Hydraulics
 Hydraulics is a branch of science and engineering concerned with the use of liquids to perform mechanical tasks.
Hydrodynamics
 Hydrodynamics is the fluid dynamics applied to liquids, such as water, alcohol, and oil.
Ideal Gas
 The Ideal Gas Law  For a perfect or ideal gas the change in density is directly related to the change in temperature and pressure as expressed in the Ideal Gas Law.
 Properties of Gas Mixtures  Special care must be taken for gas mixtures when using the ideal gas law, calculating the mass, the individual gas constant or the density.
 The Individual and Universal Gas Constant  The Individual and Universal Gas Constant is common in fluid mechanics and thermodynamics.
Knudsen number
 Used by modelers who wish to non dimensionless speed
Laminar Flow
 Laminar, Transitional or Turbulent Flow  It is important to know if the fluid flow is laminar, transitional or turbulent when calculating heat transfer or pressure and head loss.
Laplace's equation
 Describes the behavior of gravitational, electric, and fluid potentials.
Lift (force)
 Lift consists of the sum of all the aerodynamic forces normal to the direction of the external airflow.
Liquids
 Equations in Fluid Mechanics  Continuity, Euler, Bernoulli, Dynamic and Total Pressure
Mach number
 When an object travels through a medium, then its Mach number is the ratio of the object's speed to the speed of sound in that medium.
 The Mach Number  An introduction to and a definition of the Mach Number.
NavierStokes Equations
 The motion of a nonturbulent, Newtonian fluid is governed by the NavierStokes equation. The equation can be used to model turbulent flow, where the fluid parameters are interpreted as timeaveraged values.
Newtonian Fluid
 A fluid is Newtonian if viscosity is constant applied to shear force.
 Dynamic, Absolute and Kinematic Viscosity  An introduction to dynamic, absolute and kinematic viscosity and how to convert between CentiStokes (cSt), CentiPoises (cP), Saybolt Universal Seconds (SSU) and degree Engler.
NonNewtonian fluid
 NonNewtonian fluid viscosity changes with the applied shear force.
Prandtl number
 Prandtl Number is a Dimensionless number approximating the ratio of momentum diffusivity and thermal diffusivity.
Pressure
 What is Pressure?  An introduction to pressure, a definition and a presentation of common units as psi and Pa, and the relationship between them.
Reynolds Number
 The Reynolds Number  An introduction to and a definition of the dimensionless Reynold's Number.
 An Online Reynolds Number Calculator  Calculate laminar or turbulent flow with the Reynolds number online calculator.
 Reynold's Number in Water Tubes  Reynolds Number in tubes at different dimensions transporting clean cold water.
Richardson number
 A dimensionless number that expresses the ratio of potential to kinetic energy.
Reynolds number
 The Reynolds number is used for determine whether a flow is laminar or turbulent.
 The Reynolds Number  An introduction to and a definition of the dimensionless Reynold's Number.
 Reynold's Number in Water Tubes  Reynolds Number in tubes at different dimensions transporting clean cold water.
Shock wave
 A shock wave is a strong pressure wave produced by explosions or other phenomena that create violent changes in pressure.
Sound barrier
 The sound barrier is the apparent physical boundary stopping large objects from becoming supersonic.
 The Mach Number  An introduction to and a definition of the Mach Number.
 Speed of Sound  Speed of sound in air, fluids and solids. Formulas and values for different materials.
Streamline  Stream function
 a streamline is the path that an imaginary particle would follow if it was embedded in the flow.
Strouhal number
 The Strouhal number is a quantity describing oscillating flow mechanisms.
 The Strouhal Number  An introduction to and a definition of the Strouhal Number.
Supersonic Flow
 Flow with speed above the speed of sound, 1,225 km/h at sea level, is said to be supersonic.
 The Mach Number  An introduction to and a definition of the Mach Number.
 Speed of Sound  Speed of sound in air, fluids and solids. Formulas and values for different materials.
Surface tension
 Surface tension is a force within the surface layer of a liquid that causes the layer to behave as an elastic sheet.
Transonic
 Flow with speed at velocities just below and above the speed of sound is said to be transonic.
 The Mach Number  An introduction to and a definition of the Mach Number.
Turbulent Flow  Turbulence
 Laminar, Transitional or Turbulent Flow?  It is important to know if the fluid flow is laminar, transitional or turbulent when calculating heat transfer or pressure and head loss.
Vapor pressure
 For a particular substance at any given temperature there is a pressure at which the vapor of that substance is in equilibrium with its liquid or solid forms.
Velocity
 The Bernoulli Equation  A statement of the conservation of energy in a form useful for solving problems involving fluids. For a nonviscous, incompressible fluid in steady flow, the sum of pressure, potential and kinetic energies per unit volume is constant at any point.
Venturi
 A Venturi is a system for speeding the flow of the fluid, by constricting it in a coneshaped tube.
Viscosity
 Dynamic, Absolute and Kinematic Viscosity  An introduction to dynamic, absolute and kinematic viscosity and how to convert between CentiStokes (cSt), CentiPoises (cP), Saybolt Universal Seconds (SSU) and degree Engler.
 Kinematic Viscosity for some Common Fluids  Kinematic viscosity of fluids as motor oil, diesel fuel, peanut oil and many more.
 Online Absolute or Dynamic Viscosity Calculator  Calculate absolute or dynamic viscosity between centipoise, reyn and more.
 Online Kinematic Viscosity Calculator  Calculate dynamic viscosity between centistokes, poise, lentor and more.
 Online Dynamic Viscosity Converter for Oil and Water  Convert between dynamic viscosity units for oil and water.
 A Viscosity Converting Chart  A table converting between centiPoises, milliPascal, centiStokes and SSU.
 Absolute or Dynamic Viscosity of Water  Absolute or dynamic viscosity of water depends on the temperature.
Vorticity
 Vorticity is defined as the circulation per unit area at a point in the flow field.
 The Vortex Flow meter Principle  An introduction to the vortex flowmeter principle.
Wave drag
 Wave drag refer to a sudden and very powerful drag that appears on aircrafts flying at highsubsonic speeds.
Weber Number
 The Weber Number  An introduction to and a definition of the Weber Number.
Related Topics

Fluid Mechanics
The study of fluids  liquids and gases. Involving velocity, pressure, density and temperature as functions of space and time. 
Hydraulics and Pneumatics
Hydraulic and pneumatic systems  fluids, forces, pumps and pistons.
Related Documents

Conservation of Mass
The Law of Conservation of Mass states that mass can neither be created or destroyed. 
Flow Coefficient Cv vs. Flow Factor Kv
Comparing flow coefficients Cv to flow factors Kv. 
Fluid Flow  Equation of Continuity
The Equation of Continuity is a statement of mass conservation. 
Froude Number
Introduction to the Froude Number. 
Strouhal Number
Introduction to the Strouhal Number 
Weber Number
The Weber Number may be useful when analyzing fluid flows where there is an interface between two different fluids.