Environmental Engineering Reference
In-Depth Information
Researchers [79] considered steady flow of incompressible fluids in a channel
∂ /
(which is described by the Navier-Stokes equations). The velocity profile has a
parabolic form:
p
y
width 2 h under action of the force of gravity
r or pressure gradient
where, d - length of the slip, which is equal to the distance from the wall to the
point at which the velocity extrapolates to zero.
4.2 MODELING IN NANOHYDROMECANICS
We take into consideration that the mean free path of gas under normal conditions
is
, and the distance between the particles -
:
=/ ; L -
where, n - the concentration of moleculesin the air, Knudsen number
the characteristic size; d - diametermicrotubes.
Let's consider the fluid flow through the nanotube. Molecules of a substance
in a liquid state are very close to each other (Fig. 4.10).
FIGURE 4.10
The fluid flowthrough the nanotube.
 
 
 
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