Identical gases mixing

In the case of the full bubble column, the bottom gas phase mixed region is coincident with the impeller, and no significant gas mixing occurs below the impeller, in the lower region of the tank, as shown in Fig. 5.125. The dashed arrows in Fig. 5.125 and Fig. 5.126 represent mass transfer interchange between the gas space and liquid volumes of the tank. The liquid circulation, which is not shown, is identical to Fig. 5.124. 

Each reactor board has two separate connections where reactor feed gas can be introduced from the feed manifold. These connections serve as independent feed inlet points for two parallel Redwood Flow Manifolds (RFMs) that are used to control the gas flow rate to each channel of the microreactor die. A total of four microreactors can be operated since each die has two independently controlled reaction channels. The RFMs are identical to those used for the feed gas mixing board except for their inlet and exit operating pressures. 

When the flux expressions are consistent, as in Eq. (5-182), the dif-fusivities in Eq. (5-181) are identical. As a result, experimental diffu-sivities are often measured under constant volume conditions but may be used for applications involving open systems. It turns out that the two versions are veiy nearly equivalent for gas-phase systems because there is negligible volume change on mixing. That is not usually true for hquids, however. 

Sampling of slurries and solids, differs fundamentally from sampling a completely mixed liquid or gas, A hulk quantity of sohds incorporates characteristic heterogenity—that is, a sample Sj differs inherently from a sample S2 when both are taken from a thoroughly mixed load of solids as a result of property variances embodied in solids. In contrast, all individual samples from a completely mixed liquid or gas container are statistically identical. 

Mixed-Flow Turbine. The turbine as shown in Figure 1-35, is almost identical to a centrifugal compressor—except its components have different functions. The scroll is used to distribute the gas uniformly around the periphery of the turbine. 

In the simplified a/s analysis of Section 4.2 we assumed identical and constant specific heats for the two streams. Now we assume semi-perfect gases with specific heats as functions of temperature but we must also allow for the difference in gas properties between the cooling air and the mainstream gas (combustion products). Between entry states (mainstream gas 3g, and cooling air, 2c) and exit state 5m (mixed out), the steady flow energy equation, for the flow through control surfaces (A + B) and C, yields, for a stationary blade row,... 

Consider the combination of nitric oxide and oxygen. Nitric oxide (a colorless gas) when mixed with oxygen gas (also colorless) becomes reddish-brown. The color is identical to that of another gas, nitrogen dioxide. All the properties of the nitric oxide-oxygen mixture are consistent with the conclusion that the gas nitrogen dioxide has... 

Stable, conductive electrodes would also be a problem. Preliminary experiments, were carried out in a cell, using simulated flue gas nearly identical to that shown in Fig. 24. In these tests, the membranes were hot-pressed from mixed powders of electrolyte (ternary eutectic of [Na, Li, K]2 S04) with LiA102 as matrix. The electrodes were constructed of cold-pressed Li20-9Cr203, partially sintered to give a highly-porous gas-diffusion structure. The tests were encouraging up to 50% of the S02 was removed from the simulated flue gas with the application of current. Simultaneously, a stream of concentrated S03 and Oz was evolved at the anode. 

Szathmary and Luhmann [50] described a sensitive and automated gas chromatographic method for the determination of miconazole in plasma samples. Plasma was mixed with internal standard l-[2,4-dichloro-2-(2,3,4-trichlorobenzyloxy) phenethyl]imidazole and 0.1 M sodium hydroxide and extracted with heptane-isoamyl alcohol (197 3) and the drug was back-extracted with 0.05 M sulfuric acid. The aqueous phase was adjusted to pH 10 and extracted with an identical organic phase, which was evaporated to dryness. The residue was dissolved in isopropanol and subjected to gas chromatography on a column (12 m x 0.2 mm) of OV-1 (0.1 pm) at 265 °C, with nitrogen phosphorous detection. Recovery of miconazole was 85% and the calibration graph was rectilinear for 0.25 250 ng/mL. 

The presence of N2O at 80 K was confirmed in foiu ways first by determining a difference spectrum between 80 and 120 K (when it desorbed). Two N(ls) peaks (Fig. 10) (one at 402 eV and the other at 406 eV) and one 0(1 s) peak (at 531 eV) were lost on warming the intensities of the N(ls) peaks were identical. Second, the difference spectrum was shown to be identical with N2O molecularly adsorbed at 80 K on a Cu(lll) surface. Third, a mass spectrum analysis of the gas phase on warming from 80 K showed the presence of N2O and last, helium-induced valence-level spectra at 80 K were consistent with a NO-N2O mixed adlayer (44, 45). 

In a bioreactor, one is interested in the transfer per unit of volume of reactor, called Kia or the volumetric mass-transfer coefficient, a is the interfacial surface area per unit of volume of liquid. In a perfectly mixed tank, C has identical values at any point and C depends on the conditions in the gas phase at the outlet of the reactor. Several authors [60] consider that a better estimate of the driving force is given by the logarithmic mean concentration difference between the entry and the exit of gas. 

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