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Generally, NASA defines "high" hypersonic as any Mach number from 10 to 25, and re-entry speeds as anything greater than Mach 25. Among the spacecraft operating in these regimes are returning Soyuz and Dragon space capsules ; the previously-operated Space Shuttle ; various reusable spacecraft in development such as SpaceX Starship and Rocket ...
u is the local flow velocity with respect to the boundaries (either internal, such as an object immersed in the flow, or external, like a channel), and; c is the speed of sound in the medium, which in air varies with the square root of the thermodynamic temperature. By definition, at Mach 1, the local flow velocity u is
PTV velocity information can be used in place of 4D PC-MRI information in a CFD model. [10] The 3D velocity information from the inlet of the PTV model can be applied as the inlet boundary condition in a CFD model. That CFD model can then solve for wall shear stresses. The velocity information from PTV can also be used to create an MRI ...
The formula for evaluating the drift velocity of charge carriers in a material of constant cross-sectional area is given by: [1] =, where u is the drift velocity of electrons, j is the current density flowing through the material, n is the charge-carrier number density, and q is the charge on the charge-carrier.
Delta-v (also known as "change in velocity"), symbolized as and pronounced /dɛltə viː/, as used in spacecraft flight dynamics, is a measure of the impulse per unit of spacecraft mass that is needed to perform a maneuver such as launching from or landing on a planet or moon, or an in-space orbital maneuver.
The upper crust is characterized by low density and high porosity, leading to reduced seismic velocity. [23] Two key discontinuities have been observed: one within the crust at a depth of 5 to 10 km, [ 65 ] and another which is likely the crust-mantle boundary, occurring at a depth of 30 to 50 km. [ 22 ]
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