Forced Convection Boiling Burnout for Water in Uniformly Heated Tubular Test Sections [Thesis]

Thesis/Dissertation · Tue May 25 04:00:00 EDT 1965

OSTI ID:4556630

Griffel, Jack ^[1]

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1. Columbia Univ., New York, NY (United States)

To thoroughly study the effects of the major variables in forced-convective burnout, 402 high-pressure critical heat flux determinations were made with seven uniformly heated, internally-cooled, tubular test sections using water, subcooled at the inlet, as the coolant. The results indicate the existence of three burnout regimes: nucleate boiling, annular flow, and the still not fully explored "transition" region. An analytical study of annular flow burnout based on observations and dimensional analysis yielded a correlation which relates the critical heat flux to the significant local fluid properties and flow parameters. This equation was used to correlate and study the critical heat flux data obtained in the present work together with a selection of additional data points from the major available sources, including data for Freon-12. The equation contains four dimensionless groups and constants determined by regression analysis with a limited portion of the data. Critical heat fluxes calculated by the correlation are in good agreement with the measured values. Observations of the effects of the parameters In subcooled nucleate boiling burnout enabled the formulation of an empirical equation for this regime. The equation relates the critical heat flux only to the mass flow rate and subcooling. In testing the equation with available data it was found that the correlation holds throughout the 60 to 2000 psia pressure range equally well, thus implying that there is no pressure effect on subcooled burnout over this entire range.

• Research Organization: Columbia Univ., New York, NY (United States)
• Sponsoring Organization: US Atomic Energy Commission (AEC)
• NSA Number: NSA-20-016603
• OSTI ID: 4556630
• Report Number(s): NYO--187-7
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
BOILING
BURNOUT
CONVECTION
HEAT TRANSFER
PRESSURE
TUBES