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Saturday, July 11, 2020 | History

2 edition of friction on rotating discs and the effect on nett radial flow and externally applied whirl found in the catalog.

friction on rotating discs and the effect on nett radial flow and externally applied whirl

T. P. Bennett

friction on rotating discs and the effect on nett radial flow and externally applied whirl

by T. P. Bennett

  • 148 Want to read
  • 26 Currently reading

Published by British Hydromechanics Research Association in Harlow .
Written in English


Edition Notes

Statementby T.P. Bennett and R.C. Worster.
SeriesBHRA research report -- 691
ContributionsWorster, R. C., BHRA.
ID Numbers
Open LibraryOL20308603M

The steady flow induced by a infinite disk that rotates in its own plane at is a classical problem in fluid mechanics. It is one of the few examples of a viscous flow that involves all three components of velocity and admits an exact solution to the Navier–Stokes equations. Constant angular momentum when no net torque. Angular momentum of an extended object. Ball hits rod angular momentum example. Cross product and torque. Sort by: Top Voted. Finding torque for angled forces. Rotational version of Newton's second law. Up Next.

(). Effect of rotation speed on friction behavior and radially non-uniform local mechanical properties of AAT6 rotary friction welded joint. Journal of Adhesion Science and Technology: Vol. 32, No. 18, pp. One disc plate is rotating above the second stationary one (like rotor stator with a narrow gap between them). A fluid is flowing through center of rotating flow (similar like impinging jet flow fluid rotation disc). Does anybody has some knowlidge about a fluid friction which flows between rotating and stationar disc plate? If yes what is the.

Frictional torque on a rotating disc 0 4 8 12 16 20 24 28 32 36 0 time (s) an gu lar speed (rad/s) Figure 2. Measured values of the angular speed of the disc as a function of time are indicated by the red dots, one per revolution. Best fits of these data points to . experiments on the friction of disks rotated in fluid. (including appendix and plate at,back of volume).


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Friction on rotating discs and the effect on nett radial flow and externally applied whirl by T. P. Bennett Download PDF EPUB FB2

Flow (Dynamics), Friction, Rotating disks, Skin friction (Fluid dynamics), Surface roughness 1. Bennet, T. P., and Worster, R. C.,“The Friction on Rotating Discs and the Effect on Next Radial Flow and Externally Applied Whirl,” British Hydrodynamic Research by: 8. Bennet, T.P., Worster, R.C.,The Friction on Rotating Disc and Effect on Net Radial Flow and Externally Applied Whirl, British Hydromechanics Research Association, Cranfield, Bedford, Report RRCited by:   Effect of radial flow rate on the transition to a turbulent flow regime in the gap between a rotating and a stationary disk.

Fluid Dynamics, Vol. 21, Issue. 5, Cited by: The Friction on Rotat-ing Disc and Effect on Net Radial Flow and Externally Applied Whirl, British Hydromechanics Research Asso-ciation The Friction on Rotating Disc and Effect on Net Radial.

Potential flow field: a) streamline pattern; b) pressure distribution on stationary and rotating disc As shown in Fig 2b the radial pressure gradients are favourable on the leading side of disc.

The net radial flow through a cylinder of radius b can be obtained by integrating the radial velocity over the cylinder.

From Equation and Table with u z * =∞ =the nondimensional mass flow rate for the entrained flow is. The friction losses of rotating disks in turbomachines are often increased by protruding bolt heads and surface imperfections, especially at the rim.

This can significantly influence the heat production and flow distribution in disk cooling systems. When a > 1, the core rotation rate exceeds that of the disk and the radial flow near the rotating disk is directed inwards.

We also present accurate tabular results for two flows of special interest: (i) the flow between a stationary and a rotating disk with no suction (a = 0) and (ii) Bödewadt flow. Oil whirl In an abnormal mode of operation, the rotating shaft may not hold the centerline of the sleeve bearing.

When this happens, an instability called oil whirl occurs. Oil whirl is an imbalance in the hydraulic forces within a sleeve bearing. Under normal operation, the hydraulic forces such as velocity and pressure are balanced.

where P is the pressure (e.g. lbs/in^2) applied to the disc, mu is friction, r is the radius coordinate to any point on the disc.

In rotational coords, dA = r*dr/dtheta Assuming P and mu are indepdent of theta and r (no steering forces applied, the torque is: P*mu*pi*R 3 *2/3 Where R is the outer radius of the disc. Discussing fluid mechanics and heat transfer in rotating-disc systems, this text simplifies and extends existing information to provide a basic understanding of the subject.

Physical insight, mathematical models and experimental data are used to explain the flow structure and provide theoretical methods and correlations which will be of use to research workers and designers.

Equations describing the flow of a Newtonian liquid on a rotating disk have been solved so that characteristic curves and surface contours at successive times for any assumed initial fluid distribution may be constructed.

It is shown that centrifugation of a fluid layer that is initially uniform does not disturb the uniformity as the height of the layer is reduced. The Rotating Disc Consider a thin disc rotating with constant angular velocity, Fig.

Material particles are subjected to a centripetal acceleration a r 2 r. The subscript r indicates an acceleration in the radial direction and the minus sign indicates that the particles are accelerating towards the centre of the disc.

Figure   Suppose there are two discs held in contact such that they rotate around the same axis of rotation. A torque is applied to one of the discs, and due to friction the other disc accelerates.

Using calculus I found the torque applied due to friction for a disc to be ##\frac {2μF_N r} {3}##, meaning the acceleration is ##\frac {4μF_N } {3mr}##. The friction plate gives the resistance to rotating, the grease gives damping, to prevent the knob from abruptly rotating once enough force is applied.

The grease also makes for lubrication, elemininating the abrupt effect. You could use other methods of damping, but this one's very easy to make yourself. Static friction If we push on a block and it doesn’t move then the force we exert is less than the friction force.

push, P friction, f This is the static friction force at work If I push a little harder, the block may still not move Æthe friction force can have any value up to some maximum value. Rotation Parallel axis theorem: Assume the body rotates around an axis through P.

COM. dm Let the COM be the center of our coordinate system. P has the coordinates (a,b) a b I = ICOM+Mh 2 The moment of inertia of a body rotating around an arbitrary axis is equal to the moment of inertia of a body rotating around a parallel axis through the. Description.

The Loaded-Contact Rotational Friction block simulates friction between two rotating surfaces loaded with a normal force. The block is implemented as a structural component based on the Fundamental Friction Clutch block.

From the locked state, the two surfaces unlock if the transmitted torque exceeds the static friction, as defined by the static coefficient of friction and.

The flow field between two rotating cylinders can be solved for exactly in the fluid equations. I've got a book by White, "Viscous fluid flow", pagewhich gives a good reference.

This analysis assumes the cylinders are infinitely long and the system is in steady state, i.e., it has already started spinning and now nothing is changing with.

The incompressible flow field between two infinite parallel disks, one of them rotating and the other stationary, is analyzed and solved for situations where the radial Reynolds number is large enough to produce turbulent flow.

An effective viscosity method is used, the effective viscosity being regarded as a scalar. The validity of the approach is demonstrated for the case of boundary layer.

@article{osti_, title = {Surface roughness effects on induced flow and frictional resistance of enclosed rotating disks}, author = {Poullikkas, A}, abstractNote = {Disk friction losses in a pump are caused by the fluid flow in the gap between the impeller and the casing wall.

The classical method of determining these losses is by using a thin plain disk rotating in a close fitting close.radial velocity on the mm rotating disk in quiescent fluid with the above. The results reveal the effects of roughness (due to spray painting the disk10) and of using a finite disk.

The near-surface radial jet reaches a substantially higher peak value than that for the smooth infinite disk. This is.quite a different matter.

This chapter examines some of the effects of steady rotation of the flow environment. (Remember that rotation involves acceleration, of the radial rather than the tangential kind, even with a steady rotation rate.) The effects of rotation on the flow are striking, and I think not intuitive.

These effects.