Deep pool

Sluggish reaches, very deep pools, rather weedy 0.070 0.057... 

A deep pool of ethanol is suddenly exposed to an atmosphere of pure carbon dioxide and unsteady state mass transfer, governed by Fick s Law, takes place for 100 s. What proportion of the absorbed carbon dioxide will have accumulated in the 1 mm layer closest to the surface in this period ... 

Let us consider a case of steady evaporation. We will assume a one-dimensional transport of heat in the liquid whose bulk temperature is maintained at the atmospheric temperature, 7 X. This would apply to a deep pool of liquid with no edge or container effects. The process is shown in Figure 6.9. We select a differential control volume between x and x + dx, moving with a surface velocity (—(dxo/df) i). Our coordinate system is selected with respect to the moving, regressing, evaporating liquid surface. Although the control volume moves, the liquid velocity is zero, with respect to a stationary observer, since no circulation is considered in the contained liquid. 

The first numerical study on the transient flow of a single liquid droplet impinging onto a flat surface, into a shallow or deep pool was performed by Harlow and Shannon)397 In their work, the full Navier-Stokes equations were solved numerically in cylindrical... 

What would be the color of a very deep pool of D20 ... 

Bubble regime (Fig. 6.26s) or deep pool 1 occurs at low vapor velocities, Discrete noncoalescing bubble swarms rise through quiescent liquid, which has a very clear surface. For the air-water system, Wallis (100> showed that this regime is unlikely to occur when vapor velocities exceed 0.15 ft/sec, and therefore, in industrial columns. It may occur in bench-scale and pilot columns where outlet weirs are tall. If this regime occurs in a test unit, caution is required in data scale-up. 

The discussions in the preceding paragraph concerning / and h again apply, and it is found that the deep-pool spread-rate formula, V = may be used if the liquid depth exceeds, a value which again... 

Bubble columns where a gas is dispersed through a deep pool of liquid are commonly used in industry as absorbers, strippers, or reactors when a large liquid holdup, large liquid residence time, or large heat transfer is needed. They may be operated either countercurrently, cocurrently, or semibatch. Other advantages of bubble columns are the absence of moving parts, minimum maintenance, small floor space, ability to handle sol-... 

The decay pattern of plasma radioactivity (Figure 1) indicated that a three-compartment model could be chosen for calculation of the kinetic data. The chosen model consists of a central compartment (Figure 2) into which dietary ascorbate is absorbed and from which it is eliminated unchanged. Two other compartments are equilibrated with the central compartment. In compartment 2 the metabolism is assumed to take place and from this compartment metabolites are eliminated. Compartment 3 is a deep pool that acts as a storage compartment. 

Browne, T.R., Greenblatt, D.J., Schumacher, G.E. et al. (1990) New pharmacokinetic methods III Two simple tests for deep pool effect. Journal of Clinical Pharmacology, 30, 680-685. 

Fig. 3.4 Estimated evaporation rates for phosgene from a 6" (15 cm) deep pool at an...

Brown trout Salmo trutta) endemic to certain clear water streams in Europe have been declining in recent years (http //s.o.w.tripod.com/dyingbrowns.htm). Abnormally dark colored and blind brown trout have frequently been observed in these streams while other fish species in these streams such as rainbow trout and grayling appear unaffected. Many of these streams were channelized and are shallow with little or no canopy cover or protective in-water substrate. Conversely, unchannelized streams that appear to support healthy brown trout populations have rocky bottoms substrates as well as shade from tree canopy that can provide places for fish to avoid excessive solar radiation. These unchan-nellized streams also had deep pools and were often tea-colored from tannic substances. Such observations provide circumstantial evidence that solar UV may be affecting brown trout in certain streams in Europe. 

High efficiencies require deep pools of liquid on the tray (long contact time) and relatively high gas velocities (large interfacial contact areas and mass-transfer coefficients). These conditions, however, lead to a number of difficulties. One is the mechanical entrainment of liquid droplets in the rising gas stream. At high gas velocities, when the gas disengages from the froth, small droplets of liquid are carried by the gas to the tray above. Liquid carried up the tower in this manner reduces mass transfer and consequently affects the tray efficiency adversely. 

Irradiation Facility. The swimming pool type irradiator includes an irradiation chamber (4 X 4 X 2.3 m) connected to a 4-m-deep pool where the Co panel source is stored (Figure 1). The source activity at present is 7.4 X 10 Bq (2 x 10 Ci), with a permissible maximum of 3.7 X 10 Bq (10 Ci) for this facility. Co gives a very simple y-ray spectrum, two sharp lines of equal intensity at 1.17 and 1.33 MeV. 

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