A Statistical Comparison of Various Fluids for a Drift Flux Model in Reduced Gravity Two-Phase Slug Flow Conference Paper uri icon

abstract

  • The desire to utilize enabling, two-phase (gas-liquid) systems for advanced life support and thermal management are driven by NASA's exploration initiative and the early development of commercial space interests. Two-phase flow heat transfer is highly advantageous over single-phase systems. Two-phase fluid loops provide significant thermal transport advantages over their single-phase counterparts and are able to carry more energy per unit mass than single-phase systems at reduced pumping power per unit mass. These advantages alone offer great reductions in both mass and volume, as well as power requirements; unfortunately, the ability to predict two-phase phenomena such as flow regime transitions and void fraction at microgravity conditions is greatly limited and its development will facilitate the utilization of two-phase systems. The drift flux model is a useful tool to predict the void fraction and thus, the pressure drop. Results of a statistical analysis indicate that for water/air and water-Zonyl/air fluids, the drift velocity, Ugj, is -0.070 and the distribution parameter, C0, is 1.269. These results indicate that the surfactant used had little effect on the model compared to the liquid density difference from the water-glycerin mixture as well as the liquid density and vapor density differences from the refrigerants R12 and R134a. 2005 American Institute of Physics.

name of conference

  • SPACE TECHNOLOGY AND APPLICATIONS INT.FORUM-STAIF 2005: Conf.Thermophys in Micrograv;Conf Comm/Civil Next Gen.Space Transp; 22nd Symp Space Nucl.Powr Propuls.;Conf.Human/Robotic Techn.Nat'l Vision Space Expl.; 3rd Symp Space Colon.; 2nd Symp.New Frontiers

published proceedings

  • AIP Conference Proceedings

author list (cited authors)

  • Kurwitz, C.

citation count

  • 0

complete list of authors

  • Kurwitz, Cable

publication date

  • December 2005

publisher

  • AIP  Publisher