Notation A: The area of sand subsidence [rho]: Density C: The volume concentration of sand Q: Volume flux d: Diameter of borehole R: Hydraulic radius [h.sub.w]: Head loss Re: Reynolds number [h.sub.f]: Frictional head loss S: Cross-sectional area [h.sub.j]: Local head loss [mu]:
Dynamic viscosity J: Hydraulic slope v: Velocity k: Friction coefficient [chi]: Wetted perimeter [k.sub.s]: Roughness height z: Third Cartesian coordinate of cross-sectional area L: The length of circular pipe [lambda]: Flow resistance ratio p: Relative pressure.
Savic, "Mathematical modelling of changing of
dynamic viscosity, as a function of temperature and pressure, of mineral oils for hydraulic systems," 6 Facta Universitatis-Series: Mechanical Engineering, vol.
For lubricating fluids, heat generated by the internal friction and the corresponding increase in temperature affects the viscosity of the fluid; hence, it may not be realistic to constant function of plastic
dynamic viscosity knowing fully well that space-dependent internal heat source is significant.
The relation between the bubble radius R and the
dynamic viscosity [eta], for the range 2 x [10.sup.-3] < [eta] < 7 x [10.sup.-3] Pa.s .
where [[theta].sub.A] is the advancing dynamic contact angle; [[theta].sub.R] is the receding dynamic contact angle; [[theta].sub.0A] is the equilibrium advancing contact angle; [[theta].sub.0R] is the equilibrium receding contact angle; capillary number, Ca = [mu]U/[sigma], which shows the relative importance of viscous force to capillary force; [mu] is the
dynamic viscosity of liquid; U is the liquid contact line velocity; and [sigma] is the surface tension of the liquid mixture.
1 exhibits the variation of
dynamic viscosity, versus different compositions of CTAB/SDS at different temperatures.
After 24 hours cooling, the quality of synthesized starch adhesives was ascertained by investigating their physical properties like
dynamic viscosity, surface tension, and density.
Embryo culture medium properties were assumed to be those of liquid water, (density [rho] = 998.2 kg/[m.sup.3] and
dynamic viscosity [mu] = 0.001003 kg/(m x s)).
Dynamic viscosity was calculated using the following formula: