Roll pump

Example 6.1 The Synthesis of the Roll Pump Consider building block 1 in conjunction with an infinite surface created by a rotating solid cylinder, as shown in Fig. E6.1a(a) and Fig. E6.1a(b). The curvature of the cylinder does not change the concept and mechanism of drag flow. Next, the stationary surface must be created. The simplest solution is to place the solid cylinder inside a stationary barrel, as in Fig. E6.1a(c) and Fig. E6.1a(d), where in addition we created entrance and exit ports through the barrel separated by a solid obstruction. 

Fig. E6.1a The synthesis of a roll pump from building block 1. (a) The building block (b) a rotating solid cylinder forms the moving surface (c) the inner surface of a hollow cylinder forms the stationary surface. The two surfaces create a curved shallow pumping channel. Entrance and exit ports are formed by openings in the outer cylinder, and they are separated by a channel block (d) side view of the roll pump.

Fig. E6.1b Alternative design solution of a roll pump from building block 1. On the top we see two two-roll pumps one co-rotating and the other counterrotating. The latter is a toothless gear pump where the pumping mechanism is viscous drag rather than positive displacement. In the middle we have three three-roll configurations, and at the bottom a four-roll pump.

Example 6.5 The Synthesis of the Disk Processor In this example, we once again take building block 1 and pair it with the flat face of a rotating disk to obtain a disk processor, as shown in Fig. E6.5a. As was the case in the roll pump, the inlet and outlet ports are cut into the... 

The Roll Pump Derive a mathematical model for the roll-pump [depicted in Fig. E6. la(c)] having a barrel inner diameter, D, and a roll diameter, Ds, relating the flow rate, Q, pressure rise, Pout — Pln, and roll speed, N, to the relevant geometrical variables. Neglect back flow over the channel blade clearance. 

By means of an automatic infusor or a roll pump, 300-400 ml/ hour are reinfused through a filter system with a pore diameter of 22 pm via a central vein catheter. Reinfusion time should be... 

The heart of a hose pump is the rolling pump head. Usually this will be a precision multi-roller pump head for accurate flows. The fluid is being drawn into the pump, trapped between two shoes or rollers and finally being expelled from the pump. The complete closure of the hose which is squeezed between a shoe and the track, gives the pump its positive displacement action, preventing backflow and eliminating the need for check-valves when the pump is not running. 

Process condition monitoring system (sometimes also called technological monitoring system) These systems collect information from QCS sensors, vibration sensors, pressure sensors, triggers at rolls and fabrics, etc. to analyse the reasons for periodic quahty disturbances. AU collected signals are taken simultaneously with sample rates from 100 Hz to 4 kHz, depending on sensor type and application. The required measurement frequency is given by the revolution time of the machine elements which can cause quality variations, like felts, rolls, pumps, etc. 

Fig. 15.2 Schematic diagram of an in vitro perfusion system for laminar shear stress conditions. Flow chamber contains the biomaterial with cultivated cells (e.g. HUVECs). Perfusion with full blood, isolated leukocytes, platelets or cell culture media. Rolling pump applies various volume rates. After perfusion, the perfused cells on the biomaterial (e.g. proliferation, vitality, PCR, Western blotting) and the supernatant (e.g. flow cytometry, ELISA) should be analyzed...

Because of the low viscosities of cryogenic Hquids, rolling element bearings seem better suited than hydrodynamic bearings for turbo pumps. AISI 440C stainless balls and rings generally are preferred for their corrosion resistance over the more commonly used AISI 52100 steel. 

The motor carries and supports any axial thrust by the pump (hydraulic or mechanical). The motor on these pumps can be fitting with precision rolling element bearings, either angular contact, spherical rollers, or pillow blocks inclined depending on the thrust load and velocit of the shaft. 

Oil mist systems exist to provide eontinuous minute quantities of oil fog to the rolling assembly. These systems normally employ an additional pump, atomizer, and filter. These systems are gaining popularity in hot applieations, or with heaty thrust and radial loading. The oil fog is sprayed into the bearing ehamber with either a wet sump or a dry sump. The wet sump method provides the bearings with a bath (the liquiei oil level) and a fog spray. See Figure 11-1. 

Iversen, H. W., Rolling, R. E., Carlson, J. J. Volute pressure distribution, radial force on the impeller and volute mixing losses of a radial flow centrifugal pump. Trans. ASME, journal of Engineering for Tower 82 (1.960), pp. 136-144. 

Measurement locations should be permanently marked to ensure repeatability of data. If transducers are permanently mounted, the location can be marked with a center punch, paint, or any other method that identifies the point. The following sections give the recommended locations and orientations of measurement points for the following common machines or machine components compressors, electric motors, fans and blowers, gearboxes, process rolls, and pumps. 

Gear casings can be small, since their oil reservoirs can be sited remotely. In most rolling mills, for instance, oil cellar houses storage tanks, pumps, heat exchangers and filters. 

Variable, high-torque machine hains operating at moderate speeds Run-out table rolls Vertical pump shafting... 

Three-phase furnaces, 12 304 Three-roll mills, 18 65 Three-screw pumps, 21 73 Three-stage (ternary) cascade refrigeration systems, 21 549-550 Three-stage refrigeration systems,... 

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