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3 edition of Prediction of gas-liquid two-phase flow regime in microgravity found in the catalog.

Prediction of gas-liquid two-phase flow regime in microgravity

Prediction of gas-liquid two-phase flow regime in microgravity

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  • 17 Currently reading

Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Two-phase flow.,
  • Reduced gravity environments.

  • Edition Notes

    Other titlesPrediction of gas liquid two phase flow regime in microgravity.
    StatementJinho Lee and Jonathan A. Platt.
    SeriesNASA technical memorandum -- 106274.
    ContributionsPlatt, Jonathan A., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL18068837M

    Two-phase pipe flow in microgravity without and with phase change: Recent progress and future prospects, Inte rfacial Phenomena and Heat transfer, Vol. 3, , pp. 1- The nature of the interaction between the flowing phases in a cocurrent gas‐liquid downflow through packed beds depends on the type of the flow regime. The interaction is poor and geometric in nature in gas‐continuous flow and becomes high and dynamic in pulse flow due to gas dispersion, acceleration, and mixing of the liquid in the pulses.

    Get this from a library! Studies of two-phase gas-liquid flow in microgravity. [William Scott Bousman; United States. National Aeronautics and Space Administration.].   Firstly, an appropriate validated numerical simulation scheme for two phase gas-liquid flow using ANSYS Fluent has been used to simulate possible flow regime transitions in vertical pipe. The scheme could predict the various flow regimes spanning bubbly to annular flow without prior knowledge of the flow : David Alaita, Mamdud Hossain, Sheikh Zahidul Islam.

    The capillary driven seepage in porous media under microgravity conditions is investigated. Experiments on the flow of a liquid in an inhomogeneous artificial porous medium are presented. A scaling analysis of gas-liquid two-phase flow pattern in microgravity, based on the dominant physical mechanism, was carried out with the goal of predicting the gas-liquid two-phase flow regime.


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Prediction of gas-liquid two-phase flow regime in microgravity Download PDF EPUB FB2

An attempt is made to predict gas-liquid two-phase flow regime in a pipe in a microgravity environ-ment through scaling analysis based on dominant physical mechanisms. Simple inlet geometry is adopted in the analysis to see the effect of inlet configuration on flow regime transitions.

Microgravity two phase flow features. From reduced gravity experiments that have been conducted, typically aboard aircraft, the following general features of two-phase flow have been observed.

• Two phase flow in pipes exhibit the axisymmetric flow regimes of bubble. Get this from a library. Prediction of gas-liquid two-phase flow regime in microgravity. [Jinho Lee; Jonathan A Platt; United States. National Aeronautics and Space Administration.].

Experimental data Prediction of gas-liquid two-phase flow regime in microgravity book flow pattern transitions, pressure drop, and flow characteristics for cocurrent gas–liquid flow through packed columns in microgravity is analyzed. The pulse flow regime exists o Cited by:   The flow regime data are compared to the widely used Talmor map and a new transition criterion between bubble and pulse flow in microgravity is proposed.

The pressure‐drop data clearly show that interfacial effects can increase the pressure drop by as much as % compared to those predicted by the single‐phase Ergun by: A reduced gravity environment (or "microgravity"), provides an excellent tool to study the flow without the masking effects of gravity.

This book presents for the first time a comprehensive coverage of all aspects of two-phase flow behaviour in the virtual absence of gravity. Gas–liquid two‐phase flow through packed beds in microgravity.

Brian J. Motil. Corresponding Author. NASA Glenn Research Center, Cleveland, OH NASA Glenn Research Center, Cleveland, OH Search for more papers by this author. Vemuri Balakotaiah. It is to be noted that when the Revellin () sub-regimes are combined into the primary two-phase flow regimes, of the data points fall in the Bubble regime, in the Slug, and in the Annular flow by: Two-phase air-water flow pattern data are reported at microgravity conditions during a series of parabolic trajectories flown on the NASA KC aircraft.

The liquid superficial velocity ranges from to m/s, and the gas superficial velocity from to m/s. A series of two-phase gas-liquid flow experiments were developed to study annular flows in microgravity using the NASA Lewis Learjet. A test section was built to measure the liquid film thickness around the perimeter of the tube permitting the three dimensional nature of the gas-liquid interface to be observed.

Gas-Liquid Two-Phase Flows Through Packed Bed Reactors in Microgravity The simultaneous flow of gas and liquid through a fixed bed of particles occurs in many unit operations of interest to the designers of space-based as well as terrestrial equipment.

Examples include separation columns, gas-liquid reactors, humidification, drying. A concave parallel plate capacitance sensor has been developed to measure the two-phase flow void fraction for the purpose of objectively identifying flow regimes.

The sensor has been used in conjunction with a two-phase flow loop onboard the NASA Lewis DC-9 microgravity aircraft, and data was recently by: A rotating gas-liquid separator is located at the outlet of the two-phase flow line. It consists of an external cylinder of 25 cm i.d.

x 40 cm high, in which an inner cylinder of 17 cm dia rotates at by: Depending on the flow orientation and the phase velocities, gravitational forces could significantly alter the flow regime, and hence the pressure-drop and heat-transfer coefficients associated with the flow.

A reduced gravity environment (or "microgravity"), provides an excellent tool to study the flow without the masking effects of gravity. Gas-liquid flow experiments have been performed in small tubes of 19 mm, 10 mm and 6 mm diameter, during parabolic flights, for a range of superficial liquid velocities from Author: Catherine Colin.

Bengt Sundén, Juan Fu, in Heat Transfer in Aerospace Applications, Two-Phase Flow Measurements. Two-phase flows under microgravity conditions appear in a large number of important applications in fluid handling and storage and in spacecraft thermal and power systems (e.g., condensers, evaporators, piping system).

The physics of this ubiquitous flow is. Microgravity two-phase flow transition. Modeling in prediction of microgravity two-phase slug–annular flow pattern transition.

Acta Astronautica, Vol. 69, No. Microgravity gas–liquid flow through packed beds. Acta Astronautica, Vol. 68, No. Two-phase slug-to-annular flow pattern transition in microgravity. The two-phase flow in these experiments was in either the bubbly or annular flow regime.

Values of the two-phase multiplier and void fraction obtained from the measured data were found to. The opinion of the author is that which definition of two-phase viscosity to use depends much on the two-phase flow regime and less on the physical structure of the two-phase viscosity itself.

As a matter of fact, till today some water-tube boiler design methods still use single-phase water viscosity in the homogeneous model with good by: 9. The determination of flow patterns is a fundamental problem in two-phase flow analysis, and an accurate model for gas-liquid flow pattern prediction is critical for any multiphase flow characterization as the model is used in many applications in petroleum : Gene Mask, Xingru Wu, Kegang Ling.

An attempt is made to predict gas-liquid two-phase flow regime in a pipe in a microgravity environment through scaling analysis based on dominant physical mechanisms. Simple inlet geometry is adopted in the analysis to see the effect of inlet configuration on flow regime.

The flow regimes and pressure drop in a slit microchannel with a height of  μm and width of 10 mm are studied experimentally. The boundaries between the regimes are precisely determined using the developed procedure. The homogeneous flow model and the separated flow model are considered for determining the frictional pressure drop.

Author: F. V. Ronshin, F. V. Ronshin, Yu. A. Dementyev, Yu. A. Dementyev, E. A. Chinnov, E. A. Chinnov, V. V.Two-Phase Flow Regime Map Predictions Under Microgravity AIChEJ.,34, {}. Rcinarts, T. R. Adiabatic two phase /tow reqime data .