Two-Phase Pressure Drop in a Twisted Tape Boiler for a Microgravity Rankine Cycle Power System

Details Two-Phase Pressure Drop in a Twisted Tape Boiler for a Microgravity Rankine Cycle Power System Two-Phase Pressure Drop in a Twisted Tape Boiler for a Microgravity Rankine Cycle Power System

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..813...35o&link_type=abstract

SPACE TECH.& APPLIC.INT.FORUM-STAIF 2006: 10th Conf Thermophys Applic Microgravity; 23rd Symp Space Nucl Pwr & Propulsion; 4th C

Physics

Fluid Dynamics

Gas/Liquid Flows, Heat Flow In Multiphase Systems, Pressure And Temperature Measurements, Spaceborne And Space Research Instruments, Apparatus, And Components

Scientific paper

A once-through type boiler with twisted tape inserts has been proposed for a Rankine cycle power system in space since the 1960s. However, information regarding fluid dynamics such as pressure drop in the boiler is not established well. As a fundamental study of the system characteristics, adiabatic two-phase pressure drop is measured over the range of 0 to 175.4 kg/m2s for water and 0 to 25.4 kg/m2s for air and is compared using the Homogeneous model and correlations of two-phase multipliers. The Homogeneous model and the Lockhart-Martinelli correlations predict by 30 % of the experimental results. The Friedel correlation predicts much higher values and the Jensen correlation predicts much lower values. Flow regimes for each test point are observed by a high speed camera. To evaluate the diabatic pressure drop, a heat exchanger with a twisted tape insert is designed. R-11 is used as a working fluid and boiler is heated with hot water. For the diabatic pressure drop, the values predicted by the Homogeneous model are approximately 30% lower than the experimental results.

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