Accession Number:

ADA159646

Title:

Liquid-Vapor Flow Regime Transitions for Use in Design of Heat Transfer Loops in Spacecraft - An Investigation of Two-Phase Flow in Zero Gravity Conditions

Descriptive Note:

Final rept. 21 Sep 1984-21 Mar 1985

Corporate Author:

AIR FORCE WRIGHT AERONAUTICAL LABS WRIGHT-PATTERSON AFB OH

Personal Author(s):

• Lovell, T. W.

Report Date:

1985-05-01

Pagination or Media Count:

125.0

Abstract:

The behavior of viscous or low velocity two-phase vapor-liquid flow under zero gravity was simulated in the laboratory by using two immiscible fluids of equal density flowing together in a one inch diameter glass tube. The fluids used were Polypropylene Glycol PPG which simulated the liquid phase and water which simulated the vapor phase. Various tests were conducted varying flow rates and entrance conditions. Four existing flow regime models were analyzed, modeled on a computer, and extrapolated to predict zero-gravity conditions. The flow regimes were the Horizontal Dukler-Taitel, Vertical Dukler-Taitel, Vertical Weisman and Horizontal Weisman. None of these models when extrapolated to zero-g conditions agreed well with the lab data, and some of the observed flow regimes were not predicted at all.

Descriptors:

• *HEAT TRANSFER
• *TWO PHASE FLOW
• COMPUTERIZED SIMULATION
• SIMULATION
• LABORATORY TESTS
• SPACECRAFT
• VAPORS
• WATER
• TEST METHODS
• GLASS
• VAPOR PHASES
• LOW VELOCITY
• POLYPROPYLENE
• FLOW RATE
• MATHEMATICAL PREDICTION
• LIQUID PHASES
• MODEL TESTS
• FLUIDS
• TRANSITIONS
• WEIGHTLESSNESS
• LOOPS
• VISCOSITY
• TUBES
• EXTRAPOLATION
• GLYCOLS

Subject Categories:

• Test Facilities, Equipment and Methods
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE