# slip velocity

## slip velocity

[′slip və‚läs·əd·ē]
(fluid mechanics)
The difference in velocities between liquids and solids (or gases and liquids) in the vertical flow of two-phase mixtures through a pipe because of the slip between the two phases.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Different methods are known to determine wall slip velocity. According to Mooney , wall slip can be evaluated from data obtained in pressure driven flows with high pressure capillary rheometers or slit dies.
By substituting the slip velocity from Equation 1, the slip power would be defined as:
These two accommodation coefficients for momentum and energy transfer  are key parameters in the estimation of slip velocity and temperature jump, respectively.
where [F.sub.drag,c] is the drag force on the continuous phase, [F.sub.drag,d] is the drag force on the dispersed phase, [beta] is a drag force coefficient, and the slip velocity is defined as
Bakhti and Azrar  studied the steady flow of a couplestress fluid through constricted tapered artery under influence of a transverse magnetic field, moving catheter, and slip velocity. Solutions to velocity and shear stress are expressed with Bessel's functions.
From a quantitative point of view, each of the nine cases (#1 to #9) described in Table 2 is characterized by the slip velocity profile that the airfoil generates past the droplet.
The longitudinal slip is obtained by dividing the slip velocity by the velocity of the vehicle
Such that instantaneous wheel slip velocity ([V.sub.sc]) can be calculated from the deviation between the measured and actual robot velocity as in (12).
In the above equations, [C.sub.air] is the specific heat capacity of air, [[mu].sub.air] is the dynamic viscosity and the difference between the air velocity, [v.sub.air], and the particle velocity, [v.sub.p], is also known as the slip velocity.
A droplet slip velocity [DELTA][w.sub.l] = [w.sub.l] - [w.sub.g] defines a convection heating intensity, that determines Reynolds number Re = 2R [absolute value of [DELTA]w] [[rho].sub.g] /[[mu].sub.vg], where a gas density is chosen according to temperature [T.sub.d], and liquid vapor and gas mixture dynamic viscosity coefficient is selected by temperature according to "1/3" rule: [T.sub.vg] [equivalent to] [T.sub.R] + ([T.sub.g] - [T.sub.R])/ 3.
Without these mechanisms, dynamic rupture easily reaches seismic slip velocity of about 1m/s, which is roughly constrained by seismic wave speed (~3km/s) and by strain change ([10.sup.-4]) during rupture.

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