A STUDY OF SLIP RATIOS FOR THE FLOW OF STEAM-WATER MIXTURES AT HIGH VOID FRACTIONS (thesis)

Technical Report · Sat Oct 31 00:00:00 EST 1964

OSTI ID:4153521

Vance, W H

Data were obtained on the ratio of the average vapor velocity to the average liquid velocity (slip ratio) for steam-water mixtures flowing adiabaticaliy in a horizontal 1/2in. ID tube. The slip ratios were computed from data taken on a specially constructed apparatus which employed the impulse plate principle to measure the forward momentum. The experimental conditions, which were all within the dispersed flow regime according to Baker's flow pattern correlation, covered a pressure range from 30 to 80 psia, flow rates of 200 to 800 lbm/ft/sup 2/-sec, and qualities from 0.02 to 0.8. The experimental slip ratios ranged between 1 and 3.5 and were observed to decrease with increasing quality and pressure and increase with increasing mass velocity and pressure gradient. The slip ratios were empirically correlated with an average e ror of 8% as a function of the quality and the ratio of the mass velocity to the critical mass velocity at the same pressure and quality. A theoretical analysis of the differential equations of motion for dispersed two-phase flow showed that a significant portion of the observed average slip ratios could be accounted for by local slip between the vapor and entrained droplets, the remainder being due to a higher concentration of liquid in the low velocity region near the conduit wall. The pressure gradient was shown to be the major factor causing local slip, and very high slip ratios may be achieved at critical flow conditions due to this effect. The total pressure gradients computed by adding the acceleration pressure gradients, calculated from the empirical slip ratio correlation, to the frictional pressure gradients, predicted by the Martinelli-Nelson correlation, deviated from the experimental pressure gradients by an average of only 14%. (auth)

• Research Organization: Washington. Univ., Seattle
• NSA Number: NSA-18-001848
• OSTI ID: 4153521
• Report Number(s): TID-19493(Sect.2)
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-64
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ENGINEERING
ACTIVATED CARBON
ADIABATIC PROCESSES
ALUMINUM
AMMONIA
BERYLLIUM
BERYLLIUM CHLORIDES
BERYLLIUM OXIDES
BERYLLIUM SULFATES
BRAZIL
BRICKS
BUILDING MATERIALS
CALCINATION
CALCIUM CARBONATES
CALCIUM OXIDES
CARBON
CASTING
CHLORINATION
CHLORINE
CLEANING
CONFIGURATION
CRUCIBLES
DIFFERENTIAL EQUATIONS
DISPERSIONS
DISSERTATION
DISTILLATION
ELECTRODES
ELECTROLYSIS
EQUATIONS
ERRORS
FILTERS
FLUID FLOW
FRICTION
GRAPHITE
HIGH TEMPERATURE
HYDROGEN
IMPURITIES
IRON
IRON SULFATES
LIME
MEASURED VALUES
MELTING
MIXING
MOMENTUM
NICKEL
NITRIC ACID
ORES
PLATES
PRECIPITATION
PRESSURE
PRODUCTION
PULSES
PYROLYSIS
RODS
S