Channel rise

When thickness of draw plate enlarges and consequently length of forming channels rises more than 35% from the diameter of its prominent surface hydraulic resistance of extrusion head and this lows the plant productivity. 

In design of separating chambers, static vessels or continuous-flow tanks may be used. Care must be taken to protect the flow from turbulence, which coiild cause back mixing of partially separated fluids or which could cany unseparated hquids rapidly to the separated-hquid outlet. Vertical baffles to protect rising biibbles from flow currents are sometimes employed. Unseparated fluids should be distributed to the separating region as uniformly and with as little velocity as possible. When the bubble rise velocity is quite low, shallow tanks or flow channels should be used to minimize the residence time required. 

The exit region of a die used to extrude a plastic section is 10 mm long and has the cross-sectional dimensions shown below. If the channel is being extruded at the rate of 3 m/min calculate the power absorbed in the die exit and the melt temperature rise in the die. Flow curves for the polymer melt are given in Fig. 5.3. The product pCp for the melt is 3.3 x 10. ... 

Single channel fuel release with sufficient containment pressure rise to initiate automatic containment button-up 7..5K-J... 

In filters etc. the particles become largely static in a bed or cake and in such cases the fluid therefore passes through a fixed array of particles or a porous solid and experiences drag as it does so (Figure 2.9). The particles resist the flow, reduce the velocity and give rise to an enhanced pressure drop compared with that in open channel flow. 

At = Temperature rise, °F AT,. = Temperature rise, °F/rain t = Piston speed or travel, ft/min V = Liquid velocity, ft/sec v = Average velociry, ft/sec W = Width of channel vtith series pump, ft Wj = Weight of liquid in pump, lb whp = Water or liquid horsepower... 

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