Experimental study of the enhancement of critical heat flux using tangential flow injection
In this study, the critical heat flux (CHF) condition in subcooled flow of Freon-113 through short vertical tubes has been investigated. In addition, the concept of local tangential flow injection as a means of CHF enhancement has been studied. This concept utilizes injectors which enter the tube tangentially and at an angle to the tube axis, at several positions along the tube. For a tube without tangential injection (axial flow), data were taken with heated lengths ranging from 8.7 to 45.7 cm, mass velocities from 2107 to 6322 kg/ m/sup 2/ s, and negative values of inlet quality from 0.15 to 0.34. The data indicate that there is an interacting effect between mass velocity and tube length. A correlation has been developed to obtain the functional dependence of CHF on mass velocity, tube length and inlet subcooling. The correlation is shown to be successful in predicting the present data as well as existing CHF data obtained with water under high velocity, subcooled flow conditions through short tubes. With tangential injection (non-axial flow), data have been obtained with a total mass velocity of 2107 kg/ m/sup 2/ s. The CHF is found to increase by as much as 67% over the axial flow CHF. In addition, it has been shown that local tangential injection can be used to shift the location of CHF occurrence. This feature could be utilized in application of the method to fusion components subjected to non-uniform heat flux distributions.
- Research Organization:
- School of Engineering and Applied Science, University of California, Los Angeles, Los Angeles, California
- OSTI ID:
- 5324698
- Report Number(s):
- CONF-830702-
- Journal Information:
- HTD (Publ.) (Am. Soc. Mech. Eng.); (United States), Journal Name: HTD (Publ.) (Am. Soc. Mech. Eng.); (United States) Vol. HTD-VOL. 24; ISSN ASMHD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
420400 -- Engineering-- Heat Transfer & Fluid Flow
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700204* -- Fusion Power Plant Technology-- Cooling Systems
COOLING
CORRELATIONS
CRITICAL HEAT FLUX
DIMENSIONS
FLUID FLOW
FLUID INJECTION
FORECASTING
FREONS
HALOGENATED ALIPHATIC HYDROCARBONS
HEAT FLUX
HYDROGEN COMPOUNDS
LENGTH
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
REACTOR COMPONENTS
SUBCOOLING
THERMONUCLEAR REACTORS
TUBES
VELOCITY
WATER