Accession Number : AD0666618

Title :   TWO-PHASE GAS-LIQUID FLOW DYNAMICS: PART I. FLOW OSCILLATIONS IN TRANSPARENT, PARALLEL, VERTICAL, HEATED CHANNELS. PART II. ACOUSTIC VELOCITY IN TWO-PHASE FLOW.

Descriptive Note : Tropical rept. 1 Feb 65-30 Nov 67,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE ENGINEERING PROJECTS LAB

Personal Author(s) : Gouse,S. William , Jr. ; Evans,Rowland G. ; Deane,Charles W. ; Crowley,John C.

Report Date : NOV 1967

Pagination or Media Count : 121

Abstract : A natural and forced convection closed loop with three, parallel, vertical, transparent, heated channels with a constant pressure drop maintained across the heated channels, employing refrigerant 113 as the test fluid, was constructed and operated. Regions of uniform and oscillating flow were mapped for the following range of variables: (a) pressure level at the heated section inlet, 10-20 psig; (b) inlet subcooling to 90F; (c) mass flow rate per test section to 1200 1bm/hr; (d) uniform heat flux to 16,000 BTU/hr-sq ft. The state of the art in the measurement and prediction of the acoustic velocity in one and two-components two-phase mixtures and flows was reviewed and summarized. As the void fraction of a two-phase gas-liquid mixture increases continuously from zero to approximately 60 per cent, the propagation velocity of a pressure wave in the two-phase mixture decreases from its value in the liquid phase to a minimum and begins to rise. At the point where the liquid phase ceases to be continuous there can be a rapid rise in propagation velocity to a value approaching that in the gas phase alone. However, it was observed that in the range of void fractions, from 0.6 to 1.0, there is a range of propagation speeds which depends on the frequency of the propagating signal, the size distribution of discontinuous phase, the nature of the continuous phase, and the strength of the disturbance. (Author)

Descriptors :   (*TWO PHASE FLOW, PHYSICAL PROPERTIES), ACOUSTIC PROPERTIES, OSCILLATION, GAS FLOW, LIQUIDS, THERMODYNAMICS, VELOCITY, LAMINAR FLOW, BUBBLES, WAVE PROPAGATION, PROPAGATION, HEAT TRANSFER

Subject Categories : Aerodynamics
      Acoustics
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE