compressibility number

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• Compressibility — This article is about thermodynamics and fluid mechanics. For other uses, see Compression (disambiguation). Incompressibility redirects here. For the property of vector fields, see Solenoidal vector field. Thermodynamics …   Wikipedia

• Compressibility equation — In statistical mechanics and thermodynamics the compressibility equation refers to an equation which relates the isothermal compressibility (and indirect the pressure) to the structure of the liquid. It reads: (1) where ρ is the number density,… …   Wikipedia

• compressibility drag rise Mach number — That Mach number (beyond critical Mach number) in which the coefficient of drag increases by 0.005. It is the limit of the normal economic operation of the aircraft. Drag coefficient behavior at high showing critical mach number and… …   Aviation dictionary

• compressibility — A general term covering the effects resulting from the fact that the density of air, and gases in general, varies with pressure and hence with wind speed. The effects become apparent in the changes in the values of lift and drag coefficients of a …   Aviation dictionary

• compressibility drag — A parasite drag caused by the extraordinary compression of air ahead of an aircraft at high speeds. An aircraft not designed for sonic flights is especially prone to encounter this phenomenon as it approaches the speed of flight. The effects are… …   Aviation dictionary

• Critical Mach number — Transonic flow patterns on an aircraft wing showing the effects at critical mach. In aerodynamics, the critical Mach number (Mcr) of an aircraft is the lowest Mach number at which the airflow over any part of the aircraft reaches the speed of… …   Wikipedia

• Cauchy number — The Cauchy number, mathrm{Ca} is a dimensionless number in fluid dynamics used in the study of compressible flows. It is named after the French mathematician Augustin Louis Cauchy.When the compressibility is important the elastic forces must be… …   Wikipedia

• Reynolds number — In fluid mechanics and heat transfer, the Reynolds number mathrm{Re} is a dimensionless number that gives a measure of the ratio of inertial forces ({old mathrm V} ho) to viscous forces (mu / L) and, consequently, it quantifies the relative… …   Wikipedia

• critical drag rise Mach number — The free stream Mach number at which because of shock wave, the coefficient of drag for a given angle of attack increases rapidly. This increase in drag value should be at least 0.005. Also called a compressibility drag rise Mach number …   Aviation dictionary

• critical Mach number — i. The local Mach number at which airflow at any part of the wing attains a velocity equal to the local speed of sound. ii. The Mach number at which compressibility effects significantly influence the handling characteristics of an aircraft. This …   Aviation dictionary

• Gas — This article is about the physical properties of gas as a state of matter. For the uses of gases, and other meanings, see Gas (disambiguation). Ga …   Wikipedia