X-ray Observations of Flow Patterns in a Mercury Boiler |
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Page 14
... Flow pattern regime Single - phase liquid flow Helical large- Diffuse helical Helical Essentially va- Liquid Liquid amplitude wave streamlet liquid flow por flow with film little or no evi- terminal dence of liquid drop- slugs lets and ...
... Flow pattern regime Single - phase liquid flow Helical large- Diffuse helical Helical Essentially va- Liquid Liquid amplitude wave streamlet liquid flow por flow with film little or no evi- terminal dence of liquid drop- slugs lets and ...
Page 15
... flow pattern . For example , the boiler could be divided into four parts , each having a characteristic pattern as summarized in figure 11. There was no strong de- marcation zone between the flow pattern regimes , and the divisions in ...
... flow pattern . For example , the boiler could be divided into four parts , each having a characteristic pattern as summarized in figure 11. There was no strong de- marcation zone between the flow pattern regimes , and the divisions in ...
Page 17
... flow pattern regime , the liquid streamlet still flowed essentially heli- cally in the grooves , but it consisted of a succession of large - amplitude waves . This was the only regime where the continuity of the bulk stream appeared ...
... flow pattern regime , the liquid streamlet still flowed essentially heli- cally in the grooves , but it consisted of a succession of large - amplitude waves . This was the only regime where the continuity of the bulk stream appeared ...
Page 18
... regime ended near the boiler exit ( all visual traces of the liquid phase vanished as the liquid film progressively thinned ) . Superheater flow pattern . - From the superheater inlet to exit , repeated X - ray scans detected no liquid ...
... regime ended near the boiler exit ( all visual traces of the liquid phase vanished as the liquid film progressively thinned ) . Superheater flow pattern . - From the superheater inlet to exit , repeated X - ray scans detected no liquid ...
Page 22
... flow to higher values of G / λ for a given value of LX / G . Beyond the end of the insert , in the remainder of the boiler , the Baker chart predicts only strat- ified and wave regimes . The observations showed this to be the case even ...
... flow to higher values of G / λ for a given value of LX / G . Beyond the end of the insert , in the remainder of the boiler , the Baker chart predicts only strat- ified and wave regimes . The observations showed this to be the case even ...
Common terms and phrases
adiabatic appendix axially Baker chart boiler exit boiler inlet boiler insert zone Boiler satura boiler surface boiler wall boiler-superheater boiling bubbles centrifugal forces cm/sec condensate column corrosion results corrosive attack downstream droplets figure 11 flow and pressure flow conditions FLOW PATTERN OBSERVATIONS flow pattern regime Flowmeter pressure drop gas flow heat flux heater element helical groove helical liquid helical stream helical streamlet Inlet pressure Insert cylinder kg/sec Lewis Research Center liquid carryover liquid film terminal liquid mercury liquid phase liquid streamlet mass flow rate mercury loop metastable intervals metastable oscillations motion picture N/m² abs NASA NASA TN nucleation zone observed flow patterns oscillations and excursions phase separation pounds per hour Preheater psia pump radial acceleration saturation pressure shown in figure Slug stratified flow superheater surface tension swirling device tangential velocity thermocouples two-phase flow two-phase inception vapor quality vapor throttle wall contact wave X-ray image system X-ray system