Oxygen flux

Gas and liquid systems are explained by solubility. The solubility of oxygen at room temperature is about 10 ppm therefore the concentration of oxygen is 10 ppm (oxygen flux, Na). The solubility of oxygen at 0 °C is double that at 35 °C. Also, the solubility decreases if the electrolyte concentration is increased. The concentrations of oxygen in the gas phase and liquid phase are related to each other by the Raoult-Dalton equilibrium law. 

Based on film theory, the oxygen flux in the gas film is equal to flux in the liquid film ... 

Na Oxygen flux, kmol m 2 s 1 kL Mass transfer coefficient, m/s... 

As shown in Fig. 10-13, there is also a flux of O2 produced during net photosynthesis from the ocean to the atmosphere and an export flux of particulate and dissolved organic matter out of the euphotic zone. For a steady-state system, new production should equal the flux of O2 to the atmosphere and the export of organic carbon (Eppley and Peterson, 1979) (when all are expressed in the same units, e.g., moles of carbon). Such an ideal state probably rarely exists because the euphotic zone is a dynamic place. Unfortunately, there have been no studies where all three fluxes were measured at the same time. Part of the difficulty is that each flux needs to be integrated over different time scales. The oxygen flux approach has been applied in the subarctic north Pacific (Emerson et al, 1991) and subtropical Pacific (Emerson et al, 1995, 1997) and Atlantic (Jenkins and Goldman, 1985). The organic carbon export approach has... 

Fig. 5. Methane conversion and oxygen flux during partial oxidation of methane in a ceramic membrane reactor. Reaction conditions pressure, 1 atm temperature, 1173 K, feed gas molar ratio, CH Ar = 80/20 feed flow rate, 20 mL min-1 (NTP) catalyst mass, 1.5 g membrane surface area, 8.4 cm2 (57).

Oxygen flux is a term used to describe delivery of 02 to the tissues. An understanding of how the Po2 changes according to the location in the body is, therefore, useful when considering how the mitochondrial 02 supply is achieved. It can be represented by the 02 cascade. 

When this happens, the oxygen flux to the particle surface is cut-off because of its consumption in oxidizing CO, and C02 becomes the relevant gasification agent for the particle surface according to the Boudouard Reaction ... 

Evidence for an Interfacial Tension Mechanism. The mechanism was later tested with longer Pt/Au rods, various diameters and finally solutions of ethanol/water made up in varying ethanol concentrations. Ethanol was chosen because literature values exist for the interfacial tension of various ethanol/water compositions. Figure 3.3 shows the variation of the product of tension and the oxygen flux with particle speed as evidence in support of a interfacial tension mechanism. 

Sea-to-air oxygen flux (mol/m /yr) zonal average of world ocean... 

The resulting electric current is proportional to the oxygen flux to the cathode through the oxygen-permeable membrane that separates the electrode from a culture medium. 

Figure 4.16 An illustration of a counter-flow module for the separation of nitrogen from air. Directing the permeate to flow counter to the feed sweeps the permeate side of the membrane with a flow of oxygen-depleted gas. This increases the oxygen flux and decreases the nitrogen flux through the membrane...

Fluxes H° and //)y, which balance the oxygen fluxes into water under natural conditions, as a result of anthropogenic forcing increase, as a rule, due to more active aerobic bacteria and the increasing metabolic needs of animals. For instance, a 10°C increase in water temperature increases the oxygen expenditure on respiration of marine animals by a factor of 2.2. 

Assuming the scheme of oxygen fluxes in nature (shown in Figure 4.7) to be balanced, let us write the equations of the model in the following traditional form of balanced relationships (Table 4.8) ... 

Figure 3.86 Comparison of model and experimental data of the oxygen flux leaving the reactor in a single-channel TAP fixed-bed reactor [126]...

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