Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Speed circumferential

The feed slurry is introduced into the lower portion of the bowl through a small orifice. Immediately downstream of the orifice is a distributor and a baffle assembly which distribute and accelerate the feed to circumferential speed. The centrate discharges from the top end of the bowl by overflowing a ring weir. Solids that have sedimented against the bowl wall are removed manually from the centrifuge when the buildup of solids inside the bowl is sufficient to affect the centrate clarity. [Pg.1730]

TABLE 26-20 Influence of Relative Circumferential Speeds on Danger of Ignition for Combustible Dusts... [Pg.2324]

Higher circumferential speed capability due to inherently lower blade tip Mach number... [Pg.105]

The major advantage of film blowing is the ease with which biaxial orientation can be introduced into the film. The pressure of the air in the bubble determines the blow-up and this controls the circumferential orientation. In addition, axial orientation may be introduced by increasing the nip roll speed relative to the linear velocity of the bubble. This is referred to as draw-down. [Pg.267]

Figure 35.34 shows a slight dependency of the pressure buildup on the calender hne speed, which equals the circumferential roll speed. The general shape of the pressure curve can be understood as follows. A converging drag flow yields a pressure buildup until a barrier has been passed. The material left (=upstream) from the pressure maximum will take part in the roUing bank flow. The material between the pressure maximum and the clearance of the calender flows by means of the drag flow and pressure flow. Each material volume element wfll pass the clearance. At the position where the pressure vanishes the sheet will be taken apart from one of the rolls. [Pg.1004]

The mechanism is based on strong cooling of the products adjacent to the walls and injection of the cooled products in the form of an annular jet behind the flame, reducing its width as soon as the speed of the annular jet, proportional to the circumferential speed of the gas at the flame location becomes larger than the propagation speed of the edge flame. [Pg.135]

After detachment of the flame from the walls, the narrow ever-diminishing hot product zone behind the flame moves owing to the free convection in the centrifugal acceleration field toward the axis of rotation, with a speed scaling with circumferential velocity at the flame location, which reduces the observed flame speed to very low values, and in some cases negative ones. [Pg.135]

In an earlier phase of this work [9] the intensities of axial and circumferential components of velocity fluctuation were measured in the TC annulus, using Laser Doppler Velocimetry (LDV), for a wide range of cylinder rotation speeds. On average, the intensities of axial velocity fluctuations were found to be within 25% of the intensities of circumferential velocity fluctuations [9]. As in Ronney et al. [5], turbulence intensities were found to be nearly homogeneous along the axial direction and over most of the annulus width, and to be linearly proportional... [Pg.244]

Very often the differential rolling mills are used here two horizontal cylindrical rolls rotate at different circumferential speeds (the ratio of the speeds being 1.5-2 to 1). This uneven rotation produces a shearing action which facilitates mixing. The further processes of manufacture may vary. Usually the paste is subjected to a final rolling. [Pg.648]

Consider the steady flow inside a cylindrical channel, which is described by the two-dimensional axisymmetric continuity and Navier-Stokes equations (as summarized in Section 3.12.2). Assume the Stokes hypothesis to relate the two viscosities, low-speed flow, a perfect gas, and no body forces. The boundary-layer derivation begins at the same starting point as with axisymmetric stagnation flow, Section 6.2. Assuming no circumferential velocity component, the following is a general statement of the Navier-Stokes equations ... [Pg.310]

For hydrodynamic turbomachines (Fig. 4.1-4), the speed of the fluid flow or the circumferential velocity of the radial impellers involved is of great importance for the pressure increase per stage (A p u2 p, where p is the density of the fluid, and u is the circumferential velocity). Obviously the high circumferential velocity required for effective pressure generation can be achieved by high angular speed and / or a suitable size of the impeller. [Pg.145]

Centrifugal pumps require appropriately large circumferential speed of the impellers and a number of serially arranged stages, in order to obtain the high-pressure differences. For efficient and economic operation the specific speed, nq, of the individual pump stages (n<, = n V0,5 / H0 75 V m3/s H, m n, min 1) should stay above 10 to 20. Too small a capacity or hydraulic power transmission will not provide favourable operating conditions and it is then recommended to focus on positive-displacement pumps alternatively. [Pg.157]

It may readily be seen by averaging the equation for o that the form given for mi. in equation (23) agrees with that previously derived in equation (21). It is interesting that the ultimate distribution of Ci is independent of 0-, physically this is because circumferential diffusion brings a molecule into a stream of precisely the same speed and so contributes nothing to the movement of the centre of gravity. [Pg.113]

The mixer comprises two adjacent screws rotating in one direction at the same speed. The meshed screws provide for self-cleaning of the machine. The foregoing mixer incorporates sectional screws made up of screw bushes and mixing discs, which are circumferentially displayed relative to one another. [Pg.152]

Here vr is the radial speed of the liquid, vo is circumferential velocity of the liquid, to is the velocity of rotation of the cylinder. [Pg.140]

The bare wire is unwound, sometimes by a controlled tension device, and is preheated to a temperature above the Tg or Tm of the polymer to be extruded this is done so that the layer next to the bare wire adheres to it, and to drive moisture or oils off the conductor surface. The wire is fed in the back of the cross-heat die and into a guider tube. Upon exiting the guider, it meets the molten plastic, which covers it circumferentially. Since the wire speed, which is controlled by a capstan at the end of the line, is usually higher than the average melt velocity, a certain amount of drawdown is imposed on the melt anywhere from a value slightly greater than unity to 4. [Pg.727]


See other pages where Speed circumferential is mentioned: [Pg.210]    [Pg.253]    [Pg.665]    [Pg.210]    [Pg.253]    [Pg.665]    [Pg.388]    [Pg.2324]    [Pg.499]    [Pg.348]    [Pg.433]    [Pg.527]    [Pg.704]    [Pg.705]    [Pg.705]    [Pg.711]    [Pg.739]    [Pg.537]    [Pg.130]    [Pg.130]    [Pg.133]    [Pg.133]    [Pg.133]    [Pg.221]    [Pg.15]    [Pg.17]    [Pg.860]    [Pg.245]    [Pg.247]    [Pg.46]    [Pg.558]    [Pg.558]    [Pg.185]    [Pg.145]    [Pg.161]    [Pg.111]   
See also in sourсe #XX -- [ Pg.314 ]




SEARCH



Circumferential

© 2024 chempedia.info