Boiling incipience in plane rotating water films

Journal Article · Sun May 01 04:00:00 EDT 1988 · Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States)

DOI:https://doi.org/10.1115/1.3250524· OSTI ID:5365901

Mudawwar, I ^[1]; El-Masri, M A ^[2]

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1. Purdue Univ., Lafayette, IN (USA)
2. Massachusetts Inst. of Tech., Cambridge (USA)

Knowledge of heat transfer in rotating liquid films is of paramount importance for evaluating the thermal efficiency of gas turbines with water-cooled blades. Centrifugal forces constitute the primary driving forces for liquids flowing in radial rotating channels. Coriolis forces, on the other hand, tend to thin out the flow in the form of a film that covers one side of the channel. Fully developed motion of the film is determined by a balance between centrifugal and shear forces. Thus, rotating film motion resembles that of a free-falling gravity-driven film since both are characterized by a balance between shear and body forces. However, Coriolis forces can strongly influence interfacial waves and turbulent velocity fluctuations of rotating films. This is evident from the results of Kirkpatrick (1980), who compared film thickness measurements for the cases of free-falling and rotating films. His data indicate profound waviness at higher Reynolds numbers for the case of gravity-driven films. On the other hand, interfacial waves in rotating films were found to stabilize at Reynolds numbers in excess of 8,000. This paper focuses on the effects of Coriolis forces and wall roughness on the convective heat transfer coefficient and the incipient boiling heat flux in thin rotating films.

• OSTI ID: 5365901
• Journal Information: Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States), Journal Name: Journal of Heat Transfer (Transcations of the ASME (American Society of Mechanical Engineers), Series C); (United States) Vol. 110:2; ISSN 0022-1481; ISSN JHTRA
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330103* -- Internal Combustion Engines-- Turbine
42 ENGINEERING
420400 -- Engineering-- Heat Transfer & Fluid Flow
BOILING
CONVECTION
CORIOLIS FORCE
EFFICIENCY
ENERGY TRANSFER
FILMS
FORCED CONVECTION
GAS TURBINES
HEAT FLUX
HEAT TRANSFER
MACHINERY
MASS TRANSFER
PHASE TRANSFORMATIONS
SURFACE PROPERTIES
THERMAL EFFICIENCY
THIN FILMS
TURBINE BLADES
TURBINES
TURBOMACHINERY