Condensate zone

Condensing range - hydrocarbon inlet temperature to condensing zone minus hydrocarbon outlet temperature from condensing zone. 

To calculate the condensing heat transfer coefficient requires the length of the condensing zone L to be specified. Thus, a value of L must be estimated before the calculation can be made. For the value of L to be correct, it must comply with ... 

The HTCVD apparatus can be described as consisting of three separate zones An entrance zone, a sublimation zone, and a growth (or condensation) zone. The gases used are mainly silane, ethylene, and a helium carrier. The carrier flow is very low. A schematic of the HTCVD system is shown in Figure 1.9. 

Note that the propane vapor is still condensing to propane liquid at 120°F. The condensed liquid is in intimate contact with the propane vapor, as it drips off the outside surface of the colder condenser tubes. The saturated propane vapor condenses directly to saturated propane liquid at 120°F. The saturated, or bubble-point, liquid then drips from the condensation zone of the condenser into the subcooling zone of the condenser. This is the zone where the tubes are submerged in liquid. 

Calculate intermediate water temperature. The water-temperature rise for the condensing zone can be calculated as follows, letting Tm be the intermediate water temperature ... 

Calculate overall coefficients (clean condition). For the condensing zone,... 

F . 16a-c. Dodecahedral model of cell (a) a portion of this cell containing liquid phase (b) and scheme of liquid and gas phase flow in cell (c) Rj and R2 curvature radii 1 celt wall 2 liquid phase 3 liquid phase surface 4 evaporation zone 5 condensation zone )... 

The pressure drop created between capillaries in evaporation and condensation zones forces the liquid upward, so that in each dodecahedral cell circulation of liquid and gas as well as pressure drops APf and APg occur. Due to gravitation, hydrostatic pressure AP acts in each cell. Therefore, the suction effect of capillaries is... 

Step 4. Determine the optimal geometric parameters for the condensation zone with respect to the following assumptions of the model ... 

Hence, the entire internal thermal resistance of the condensation zone appears as... 

FIGURE 9.22 Evaporation due to the heat addition from below at temperatures above the saturation. The vapor-film region, the two-phase region, and the liquid region, as well as the evaporation and condensation zones are shown. Also shown are the distributions of temperature and saturation within these regions. 

Fig. 1. Isopjerichoric focusing. A chemical environment is generated in which an environmental property described by parameter p" is changing from point to point along the z-axis p" = (z)]. A species of particles characterized by the parameter value/), corresfxtnding to the parameter/>" of the suspension fluid, is dispersed with an arbitrary distribution in the fluid column. It is assumed that there is a X>int within the gradient of the p" distribution, at which p -p"-0, where the particle parameter equals the environmental parameter (focusing or condensation zone). (From Kolin, 1977. Reproduced with permission of the publisher.)...

Although mechanical processes were certainly active during the DST, measured changes in air permeability were typically less than one order of magnitude (BSC, 2002), Permeability reductions could also be attributed to increases in fracture liquid saturation in the condensation zones. In addition, variations in fracture permeability are at least a few orders of magnitude around the DST and therefore smaller mechanical effects would not have a major effect on changes in water and gas chemistry resulting from coupled THC processes. 

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