Intermittent flow

Because gravity is too weak to be used for removal of cakes in a gravity side filter (2), continuously operated gravity side filters are not practicable but an intermittent flow system is feasible in this arrangement the cake is first formed in a conventional way and the feed is then stopped to allow gravity removal of the cake. A system of pressure filtration of particles from 2.5 to 5 p.m in size, in neutralized acid mine drainage water, has been described (21). The filtration was in vertical permeable hoses, and a pressure shock associated with relaxing the hose pressure was used to aid the cake removal. 

Disk machines having nozzles to discharge the soHds phase through small backward-pointing nozzles must have this power included in the calculations. Some thickening scroU centrifuges also use such nozzles, usuaUy with an intermittent flow. is the nozzle power ... 

The reciprocating compressor is a positive displacement, intermittent flow machine and operates at a fixed volume in its basic configuration. 

In much the same manner as pumps, compressors are classified as one of two general classes positive displacement or dynamic (see Figure 3-68) [23]. These two general classes of compressors are the same as that for pumps. The positive displacement class of compressors is an intermittent flow device, which is usually a reciprocating piston compressor or a rotary compressor (e.g., sliding vane, screws, etc.). The dynamic class of compressor is a continuous flow device, which is usually an axial-flow or centrifugal compressor (or mix of the two). 

It may be used, the relation of the time-averaged heat transfer coefficients on the top and bottom, as a criterion for determination of dryout. It was assumed that the relation he/hi < 1 indicates dryout, i.e., the surface superheat Tw -7f is greater than that, when the surface contacts single-phase water only (hg is the heat transfer at the bottom of the channel). This method can be applied to connect dryout with hydraulic conditions, if the value of he may be associated with intermittent flow parameters. 

Figure 3.9 compares the separated-to-intermittent flow regime boundaries for both 8-in.- and 4-in.-pipe experiments. The conditions are presented in terms of nondimensional superficial velocities J = Jk[pk/(pL - pc)gZ)]1/2 (or the density-modified Froude numbers). For 4-in.-pipe experiments, data have been obtained only for 3 MPa, while for the 8-in.-pipe experiments, data have been obtained for pressures of 3.0, 5.0, and 7.3 MPa. Note the value of J at the flow regime transition increased with pressure for the 8-in.-pipe experiments. 

Barnea, D., and N. Brauner, 1985, Holdup of the Liquid Slug in Two-Phase Intermittent Flow, Int. J. Multiphase Flaw 77 43-49. (3)... 

Intermediate condition bioassays are also found in the literature. Semi-static [2] experiments have been performed for SDS (Ci2-AS), with renewal of the water every 2 days [65] and intermittent flow-through [32], in which fathead minnows were exposed to NP for 20 days. 

Doses Continuous flow nebulization Intermittent flow nebulization ... 

Up to 1 mL solution for inhalation, 0.2% (2 mg) can be administered with the intermittent flow system to severely obstructed patients. 

Do not exceed the maximum daily dose of 8 mg with an intermittent flow nebulization system or 14 mg with a continuous flow nebulization system. 

Filtration of diluted or blended slurry before transfer to daytank avoids some of the pitfalls just described, but still suffers from intermittent flow... 

Intermittent flow meter operation Entrained material in CO etdting separator Installed particle filter before flow meter... 

The difference in flow types caused by the difference in flow direction is small, due to the relatively slight influence of the gravitational force in capillary tubes. Fukano and Kariyasaki [6] have shown that in capillaries, due to the predomination of surface tension force over the gravitational force, intermittent flow types occur in a much wider range of gas and liquid loadings. 

Figure 3 Effect of Hydraulic Diameter on the Intermittent Flow Regime.

This model predicted 65% of the intermittent and discrete wave flow data points within 20%. This somewhat lower prediction accuracy is due to the inclusion of the discrete-wave flow points into the data set. The above model predicted 75% of the intermittent flow points within 20%, which is comparable with the results obtained with the original intermittent flow models of Garimella et al. [24, 25]. 

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