X-ray Observations of Flow Patterns in a Mercury Boiler |
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Page 21
... nucleation zone . When this streamlet has a sufficiently great tangential velocity in the nucleation zone , it tends to persist ; but in a boiler , the downstream conditions ( e.g. , vapor phase velocity ) are constantly changing with ...
... nucleation zone . When this streamlet has a sufficiently great tangential velocity in the nucleation zone , it tends to persist ; but in a boiler , the downstream conditions ( e.g. , vapor phase velocity ) are constantly changing with ...
Page 23
... nucleation zone could account for the in- crease in metastable fluctuations as the duration of the loop operation increased beyond several hundred hours . Evidence that nucleation occurred in the insert zone is seen in figure 17 , which ...
... nucleation zone could account for the in- crease in metastable fluctuations as the duration of the loop operation increased beyond several hundred hours . Evidence that nucleation occurred in the insert zone is seen in figure 17 , which ...
Page 24
... zone seemed to confirm this . Examination of the deposits farther downstream in the boiler showed considerable evidence that granular particles were eroded from the insert zone . This could account for the cavities ( i.e. , nucleation ...
... zone seemed to confirm this . Examination of the deposits farther downstream in the boiler showed considerable evidence that granular particles were eroded from the insert zone . This could account for the cavities ( i.e. , nucleation ...
Page 26
... nucleation zone of the boiler inlet . Lewis Research Center , National Aeronautics and Space Administration , Cleveland , Ohio , January 3 , 1970 , 120-27 . APPENDIX A LOOP CONDITIONING PROCEDURE Surface contaminants could inhibit mercury ...
... nucleation zone of the boiler inlet . Lewis Research Center , National Aeronautics and Space Administration , Cleveland , Ohio , January 3 , 1970 , 120-27 . APPENDIX A LOOP CONDITIONING PROCEDURE Surface contaminants could inhibit mercury ...
Page 29
Alex Vary. Nucleate boiling Heat Flow Tendency to helical flow CD - 10686-12 Figure 18 - Representation of inception ... nucleation zone , the liquid flow pattern changed progres- sively and tended to form a helical streamlet . The flow ...
Alex Vary. Nucleate boiling Heat Flow Tendency to helical flow CD - 10686-12 Figure 18 - Representation of inception ... nucleation zone , the liquid flow pattern changed progres- sively and tended to form a helical streamlet . The flow ...
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