Film boiling heat transfer from a sphere in natural and forced convection of freon-113

Journal Article · Mon Jan 01 00:00:00 EST 1990 · Experimental Heat Transfer; (USA)

DOI:https://doi.org/10.1080/08916159008946382· OSTI ID:6874687

Dix, D; Orozco, J ^[1]

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1. Illinois Univ., Chicago, IL (USA)

Boiling heat transfer fluxes were measured on a 3.84-cm hollow copper sphere, in both forced convection and pool boiling, as a function of angular position in Freon 113. This paper reports on forced-convection tests run at speeds of 0.5 to 1.9 m/s. These tests were conducted in the stable film boiling region of the boiling curve. Significant heat transfer rates were measured in the vapor wake region of the sphere for flow film boiling. Video observations of the boiling process revealed that the flow film boiling vapor removal mechanism consisted of periodic formation and detachment of a vapor wake in the rear of the sphere. For pool boiling it was found that the heated surface had a uniform rate of energy dissipation in the stable film boiling regime, whereas in forced convection the film boiling rate was dependent on angular position. Pool film boiling tests also showed multiple humps (more than one maximum heat flux) in the boiling curve when the liquid was subcooled.

• OSTI ID: 6874687
• Journal Information: Experimental Heat Transfer; (USA), Vol. 3:2; ISSN 0891-6152
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
COPPER
HEAT TRANSFER
FORCED CONVECTION
FREONS
NATURAL CONVECTION
POOL BOILING
SPHERES
SUBCOOLED BOILING
BOILING
CONVECTION
ELEMENTS
ENERGY TRANSFER
HALOGENATED ALIPHATIC HYDROCARBONS
MASS TRANSFER
METALS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHASE TRANSFORMATIONS
TRANSITION ELEMENTS
420400* - Engineering- Heat Transfer & Fluid Flow