Mist region

Jensen and Tang suggest that the annular mist region (where the critical heat flux is governed by film dryout) occurs for qualities greater than xa given by... 

For the annular mist region (region 3), Jensen and Tang suggest the following expression ... 

Figure 7. Fracto graph of material 111 showing the fine features of a large particle in the mist region...

Figure 8.75 Fracture surfaces in brittle materials generally show a smooth region that surrounds the failure origin (mirror region) but the surface increases in roughness as the crack accelerates (mist region) until crack branching occurs. The branched region contains ridges known as hackle. (Optical micrograph courtesy of Matt Chou.)...

The saturation line divides the diagram in two distinct regions, namely the unsaturated region above the saturation line and fog (mist) region below the saturation line (Figure 5-8). The state of moist gas is determined by its temperature and relative humidity, or temperature and water content, or temperature and dew point. Dew point is the temperature at which all the water vapor present in gas would condense. 

Ripple flow has an upward-moving wavy layer of liquid on the pipe wall it may be thought of as a transition region to annular, annular mist, or film flow, in which gas flows in the core of the pipe while an anniilus of hquid flows up the pipe wall. Some of the liquid is entrained as droplets in the gas core. Mist flow occurs when all the liquid is carried as fine drops in the gas phase this pattern occurs at high gas velocities, typically 20 to 30 m/s (66 to 98 ft/s). 

Dry wall region Ultimately, if a large fraction of the feed is vaporised, the wall dries out and any remaining liquid is present as a mist. Heat transfer in this region is by convection and radiation to the vapour. This condition is unlikely to occur in commercial reboilers and vaporisers. 

ANNULAR MIST FLOW TRANSITION REGION MIST FLOW... 

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