Enhancement of critical heat flux in tubes using staged tangential flow injection: (Progress report)

Technical Report · Thu Jan 01 00:00:00 EST 1987

OSTI ID:6768990

Dhir, V K

Experimental studies of the enhancement in single and two phase heat transfer from tubes subjected to tangential flow injection have been continuing. Investigations using water as the test liquid have been focused on: single phase heat transfer coefficients; two phase heat transfer coefficients under subcooled boiling conditions; subcooled critical heat fluxes; and modeling of the enhancement under swirl flow conditions. With tangential injection up to four fold increase in the average heat transfer coefficient has been observed. During subcooled boiling the enhancement is relatively small. However swirl induced centripetal force increases vapor escape velocity and as a result higher critical heat fluxes can be accommodated. In the range of flow parameters studied up to 40% enhancement in critical heat flux has been observed with single stage injection. This enhancement is slightly less than that obtained with Freon-113. The mechanistic reasons for this observation are currently being investigated.

• Research Organization: California Univ., Los Angeles (USA). Dept. of Mechanical, Aerospace and Nuclear Engineering
• DOE Contract Number: FG03-85ER13360
• OSTI ID: 6768990
• Report Number(s): UCLA-ENG-P-5566-C-86; ON: DE87004589
• Resource Relation: Other Information: Paper copy only, copy does not permit microfiche production
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CRITICAL HEAT FLUX
SUBCOOLED BOILING
FLUID INJECTION
HEAT TRANSFER
VORTEX FLOW
CONVECTION
FREONS
SUPERHEATING
TWO-PHASE FLOW
BOILING
ENERGY TRANSFER
FLUID FLOW
HALOGENATED ALIPHATIC HYDROCARBONS
HEAT FLUX
HEATING
MASS TRANSFER
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHASE TRANSFORMATIONS
420400* - Engineering- Heat Transfer & Fluid Flow