CHF data from Freon-11 flow for scaling CHF in water

Journal Article · Sat Jan 01 04:00:00 EST 1972 · Progr. Heat Mass Transfer, v. 6, pp. 137-153

DOI:https://doi.org/10.1016/B978-0-08-017035-0.50013-6· OSTI ID:4371082

Motley, F E; Cadek, F F; Cermak, J O; Tong, L S; Gouse, Jr, S W; Paul, F; Purcupile, C

From international symposium on two-phase systems; Haifa, Israel (29 Aug 1971). See CONF-710836-. Freon-11 CHF (critical heat flux) data are presented which models water at high pressure in the subcooled region. These data were obtained from a sixteen-rod non-uniform heat-flux bundle. The heater rods were 8 ft in length and had a u sine u or cosine heat-flux shape. The data range reported includes: pressure from 160 to 515 psia, mass velocity from 1.5 to 4.0 x 10/sup 6/ lb/hr/ft/sup 2/, inlet temperature from 220 to 33O deg F, CHF from 0.4 to 1.2 x 10/sup 5/ Btu/hr/ft/sup 2/. The above pressure range is equivalent to water pressures between 1000 and 2700 psia in the subcooled region. In order to establish the scaling relationships, water CHF data was obtained using the same rod bundle and . grid geometry over the following range of parameters: pressure from 1500 to 2400 psia, mass velocity from 2.0 to 3.5 x 10/sup 6/lb/hr/ ft/sup 2/, inlet temperature from 480 to 600 deg F, CHF from 0.5to 1 x 10/sup 6/ port grid, mixing vane grid A, and mixing vane grid B. The Freon and water CHF results exhibit the same trends with respect to the above parameters. The axial location of CHF agreed in both Freon11 and water in the majority of comparable runs. The results of these two series of tests were used to determine scaling factors to relate water and Freon-11. A scaling technique of matching CHF quality was used. The scaling factors were found to be a function of pressure. These scaling factors were then used to scale the Freon CHF results to equivalent water CHF. There is good agreement with the W-3 correlation predictions for various types of grids. (auth)

• Research Organization: Originating Research Org. not identified
• Sponsoring Organization: USDOE
• NSA Number: NSA-29-018282
• OSTI ID: 4371082
• Journal Information: Progr. Heat Mass Transfer, v. 6, pp. 137-153, Journal Name: Progr. Heat Mass Transfer, v. 6, pp. 137-153; ISSN PGHMB
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

*CRITICAL HEAT FLUX-- WATER
*FREONS-- CRITICAL HEAT FLUX
DATA
DEPARTURE NUCLEATE BOILING
FLOW RATE
FUEL ELEMENT CLUSTERS
HIGH PRESSURE
N42300* --Engineering--Heat Transfer & Fluid Flow
PRESSURE DEPENDENCE
SIMULATION
SUBCOOLING
TEMPERATURE DEPENDENCE