Flow Pattern Phenomena in Two-Phase Flow in Microchannels

Keska, Jerry K.; Simon, William E.
February 2004
AIP Conference Proceedings;2004, Vol. 699 Issue 1, p3
Academic Journal
Space transportation systems require high-performance thermal protection and fluid management techniques for systems ranging from cryogenic fluid management devices to primary structures and propulsion systems exposed to extremely high temperatures, as well as for other space systems such as cooling or environment control for advanced space suits and integrated circuits. Although considerable developmental effort is being expended to bring potentially applicable technologies to a readiness level for practical use, new and innovative methods are still needed. One such method is the concept of Advanced Micro Cooling Modules (AMCMs), which are essentially compact two-phase heat exchangers constructed of microchannels and designed to remove large amounts of heat rapidly from critical systems by incorporating phase transition. The development of AMCMs requires fundamental technological advancement in many areas, including: (1) development of measurement methods/systems for flow-pattern measurement/identification for two-phase mixtures in microchannels; (2) development of a phenomenological model for two-phase flow which includes the quantitative measure of flow patterns; and (3) database development for multiphase heat transfer/fluid dynamics flows in microchannels. This paper focuses on the results of experimental research in the phenomena of two-phase flow in microchannels. The work encompasses both an experimental and an analytical approach to incorporating flow patterns for air-water mixtures flowing in a microchannel, which are necessary tools for the optimal design of AMCMs. Specifically, the following topics are addressed: (1) design and construction of a sensitive test system for two-phase flow in microchannels, one which measures ac and dc components of in-situ physical mixture parameters including spatial concentration using concomitant methods; (2) data acquisition and analysis in the amplitude, time, and frequency domains; and (3) analysis of results including evaluation of data acquisition techniques and their validity for application in flow pattern determination. © 2004 American Institute of Physics


Related Articles

  • A Cryogenic Mass Flow Sensor. Kocak, D. M.; Justak, J. F.; Caimi, F. M.; Van Sciver, S. W. // AIP Conference Proceedings;2006, Vol. 823 Issue 1, p281 

    A sensor for determining mass flow of cryogens in spacecraft propellant management is desired by vehicle designers. Current point sensor technology is incapable of determining high pressure, high flow rate cryogenic fluid quality and mass flow rate, and has proven to be inaccurate in attempting...

  • Vinci hot-firing tests reach 60-second mark.  // Interavia Business & Technology;Autumn2005, Issue 681, p41 

    This article reports on the status of the hot-firing tests of Europe's Vinci cryogenic upper-stage engine. Vinci achieved a successful test lasting 60 seconds, the longest-duration test since trials began and the first carried out under full test conditions. To meet these conditions, the...

  • Earning Its 'O'. Dornheim, Michael A. // Aviation Week & Space Technology;3/20/2006, Vol. 164 Issue 12, p32 

    The article reports that the Mars Reconnaissance Orbiter (MRO) brings new propulsion design and more redundancy to Mars. MRO is to begin a two-year science mission in November, 2006, followed by two years of relaying data from surface craft that will likely be augmented by more science...

  • Tapered Screened Channel PMD for Cryogenic Liquids. Dodge, Franklin T.; Green, Steve T.; Walter, David B. // AIP Conference Proceedings;2004, Vol. 699 Issue 1, p76 

    If a conventional spacecraft propellant management device (PMD) of the screened channel type were employed with a cryogenic liquid, vapor bubbles generated within the channel by heat transfer could “dry out” the channel screens and thereby cause the channels to admit large amounts of...

  • Experimental Flight of a Spacecraft with Solar Sail. Bobylev, A. V.; Yaroshevskii, V. A.; Zashchirinskii, A. M.; Pichkhadze, K. M. // Cosmic Research;Nov/Dec2003, Vol. 41 Issue 6, p612 

    We analyze the prospects of launching an experimental spacecraft with a solar sail. The problems hindering the implementation of this task are discussed. The ways to solve these problems are pointed out. The feasibility of organization of a system of controlling this spacecraft with a small...

  • RETOOLING ROCKETRY. Covault, Craig // Aviation Week & Space Technology;7/19/2004, Vol. 161 Issue 3, p58 

    The space propulsion industry considers more consolidation as another Apollo 11 anniversary dawns, but this time with some promise on the horizon. The new move toward consolidation of U.S. rocket propulsion companies comes as NASA on July 20 marks the 35th anniversary of the first manned lunar...

  • Going for a spin. Crystall, Ben // New Scientist;01/30/99, Vol. 161 Issue 2171, p16 

    Focuses on the spacecraft design called Roton. Its use of a rotating rocket engine; Its similarity to a helicopter; Detailing of plans for testing the prototype, the atmospheric test vehicle (ATV); Projected orbital launch date; Design innovations and projected costs.

  • Saving Old Satellites. Taverna, Michael A. // Aviation Week & Space Technology;12/1/2003, Vol. 159 Issue 22, p33 

    Orbital Recovery Ltd. has concluded a prime contract with Dutch Space, moving forward its plans for a space tug to rescue stranded telecom satellites another notch. Supported by MirCorp investor Walt Anderson, Orbital Recovery originally unveiled the space tug, called the Spacecraft Life...

  • Liquid-fueled, Laser-powered, N-class thrust Space Engine with Variable Specific Impulse. Phipps, Claude R.; Luke, James R.; Helgeson, Wesley // AIP Conference Proceedings;4/28/2008, Vol. 997 Issue 1, p222 

    We discuss the requirements for developing a lightweight laser-powered space engine with specific impulse range 200


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics