On the performance limit of closed two-phase thermosiphons
- Kogakuin Univ., Tokyo (Japan)
This paper discusses an experiment conducted to investigate the performance limit of closed two-phase thermosiphons, together with visual observations of the flow state in the adiabatic section. The working fluids were R-113, methanol, and water. The flow state at the performance limit conditions was a violently disturbed slug type, in which the vapor plugs held up the liquid slugs periodically to a high level, causing a local circulation of liquid in the adiabatic section. This phenomenon is somewhat different from the flooding observed in open systems. An equation correlating the vapor velocity at the performance limit to the rising velocity of vapor plugs in stagnant liquid columns is proposed. This correlation compares satisfactorily with the performance limit data covering a wide range of parameters.
- OSTI ID:
- 7038657
- Journal Information:
- Heat Transfer - Japanese Research; (United States), Journal Name: Heat Transfer - Japanese Research; (United States) Vol. 20:6; ISSN 0096-0802; ISSN HTJPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420400* -- Engineering-- Heat Transfer & Fluid Flow
661300 -- Other Aspects of Physical Science-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALCOHOLS
DIFFERENTIAL EQUATIONS
ENERGY TRANSFER
EQUATIONS
EQUATIONS OF MOTION
FLOW VISUALIZATION
FLUID FLOW
FLUIDS
GASES
HEAT TRANSFER
HYDROGEN COMPOUNDS
HYDROXY COMPOUNDS
METHANOL
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PARAMETRIC ANALYSIS
PARTIAL DIFFERENTIAL EQUATIONS
PERFORMANCE TESTING
REFRIGERANTS
TESTING
THERMODYNAMICS
THERMOSYPHONS
TWO-PHASE FLOW
VAPORS
VELOCITY
WATER
WORKING FLUIDS