Flowrates INDEX

The relationship between the flowrate (Q) towards the well and the pressure drawdown is approximately linear, and is defined by the productivity index (PI). 

Flowrate of the i th waste stream index for waste streams... 

As liquid flowrate inereases beyond the minimum required to suspend the partieles, the bed expands. Unfortunately, however, the expansion index n is not eonstant over all flow regimes but is a funetion of the flow. Thus... 

In a series of experiments on the flow of flocculated kaolin suspensions in laboratory and industrial scale pipelines(26-27-2Sl, measurements of pressure drop were made as a function of flowrate. Results were obtained using a laboratory capillary-tube viscometer, and pipelines of 42 mm and 205 mm diameter arranged in a recirculating loop. The rheology of all of the suspensions was described by the power-law model with a power law index less than unity, that is they were all shear-thinning. The behaviour in the laminar region can be described by the equation ... 

A highly concentrated suspension of flocculated kaolin in water behaves as a pseudo-homogeneous fluid with shear-thinning characteristics which can be represented approximately by the Ostwald-de Waele power law, with an index of 0.15. It is found that, if air is injected into the suspension when in laminar flow, the pressure gradient may be reduced even though the flowrate of suspension is kept constant, Explain how this is possible in slug flow and estimate the possible reduction in pressure gradient for equal volumetric flowrates of suspension and air. 

Figure 9. Pressure profile in a single die hole for resin Melt Index 1.03. Effect of polymer flowrate.

Figure 2.4 Reactor stability index with 50% higher feed flowrate.

Effect of Heat Of Reaction Figure 2.5 shows what happens if the heat of reaction is 10 or 20% higher than the base case value. The conversion is 80% for all these cases. As expected, the heat of reaction has no effect on the reactor volume, diameter, or area. These parameters are set by throughput, temperature, and conversion. Higher heats of reaction require higher heat transfer rates Q, which lower the jacket temperature and increase the cooling water flowrate. As shown in Figure 2.6, the result is an increase in the reactor stability index, which indicates more difficult control problems. 

Flow ratio index [kg/s], FRI = maximum solids flowrate expected after deaeara-tion of a powder in a bin. (Measures consistency small FRI for fine, highly compressible particles large FRI for particles > 400 gm, incompressible, very permeable.) Values range 0-90 kg/s. 

The importance of segregation may be estimated in looking at the magnitude of t (as compared t.o t) or at the segregation index X. Qualitatively, segregation increases with decreasing space time T (see n° 1,2), with decreasing flowrate ratio m (see n 3,... 

From the FED in Figure 1.3. the identification of the process streams is clear. For small diagrams containing only a few operations, the characteristics of the streams such as tenperatures, pressures, compositions, and flowrates can be shown direedy on the figure, adjacent to the stream. This is not practical for a more complex diagram In this case, only the stream number is provided on the diagram This indexes the stream to information on a flow summary or stream table, which is often provided below the process flow diagram In this text the flow summary table is provided as a separate attachment to the FED. 

The Dow Chemical Hazards Index is a somewhat similar index that provides an estimate of the hazard from accidental atmospheric release of toxic substances. A central factor in this analysis is the CEI, which is proportional to the square root of the ratio (toxic release flowrate) (threshold limit value). The details are available in the official guide rill. 

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