No slip condition exists because of Viscosity. The no-slip condition for viscous fluids assumes that at a solid boundary, the fluid will have zero velocity relative to the boundary. No slip condition exists because of Viscosity.

When you ask for free slip, then the term implies two things: slip: the normal component of the velocity is zero, i.e., no flux. across the boundary. free: the tangential force is zero.

Wall slip is a common problem when testing highly concentrated emulsions or suspensions on a rheometer. It is usually caused by large velocity gradients in a thin region adjacent to the wall. When slip occurs, the measured viscosity can be significantly lower than the actual viscosity of the sample.

Fluid flow in confined geometries can be significantly affected by slip at the liquid/solid interface. The measure of slip is the so-called slip length, which is defined as an extrapolated distance relative to the wall where the tangential velocity component vanishes (see picture below).

Slip velocity is the difference between the velocity of the conveying air and that of the conveyed particles. Slip ratio is the dimensionless ratio of the velocity of a particle, Cp, divided by the velocity of the conveying air, Ca.

Slip ratio is a means of calculating and expressing the slipping behavior of the wheel of an automobile. The difference between theoretically calculated forward speed based on angular speed of the rim and rolling radius, and actual speed of the vehicle, expressed as a percentage of the latter, is called ‘slip ratio’.

In fluid dynamics, the no-slip condition for viscous fluids assumes that at a solid boundary, the fluid will have zero velocity relative to the boundary. The fluid velocity at all fluid–solid boundaries is equal to that of the solid boundary.

1. Determine n. n = 0.678.
2. Determine K. K = 0.365.
3. Determine annular velocity. AV = 154.4 ft/min.
4. Determine cutting slip velocity. µ = 53.88 centi-poise.
5. Determine slip velocity (Vs) Vs = 35.78 ft/min.
6. Determine net rise 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.

What happens if system works in slip boundary condition? Ans: when velocity of adjacent layer of fluid is equal to velocity of solid surface, there is no slip boundary condition. In slip boundary condition, effect of solid boundary on fluid flow will not be considered.

No-slip condition is believed to be valid as far as the characteristic scale of the flow is much greater than the mean length of the path of the fluid molecular between collisions. The wall material does not matter as far as it is rigid.

The continuum assumption is an idealization of continuum mechanics under which fluids can be treated as continuous, even though, on a microscopic scale, they are composed of molecules. Fluid properties can vary continuously from one volume element to another and are average values of the molecular properties.

Types of Fluids

• Ideal fluid. A fluid is said to be ideal when it cannot be compressed and the viscosity doesn’t fall in the category of an ideal fluid.
• Real fluid.
• Newtonian fluid.
• Non-Newtonian fluid.
• Ideal plastic fluid.
• Incompressible fluid.
• Compressible fluid.
• Steady or Unsteady Flow.

An ideal fluid is a fluid that has several properties including the fact that it is: • Incompressible – the density is constant • Irrotational – the flow is smooth, no turbulence • Nonviscous –(Inviscid) fluid has no internal friction ( η = 0)

Fluid mechanics is difficult indeed. The primary reason is there seems to be more exceptions than rules. This subject evolves from observing behaviour of fluids and trying to put them in the context of mathematical formulation. Many phenomena are still not accurately explained.

Fluid mechanics is considered one of the toughest subdisciplines within mechanical and aerospace engineering. It is unique from almost any other field an undergraduate engineer will encounter. It requires viewing physics in a new light, and that’s not always an easy jump to make.