Steam bubbling regimes and direct contact condensation heat transfer in highly subcooled water

Analysis of flow pattern and heat transfer in direct contact condensation

“…Furthermore, most of these studies (Simpson and Chan, 1982;Jeje et al, 1990;Aya and Nariai, 1991;Liang and Grifffith, 1994;Chun et al, 1996;Seong et al, 2000;Kim et al, 2001Kim et al, , 2004Gulawani et al, 2006;Wu et al, 2007) have proposed semiempirical correlations for the calculation of average condensation HTC near the vicinity of plume (vapor-liquid) interface. Simpson and Chan (1982) studied the dynamic behavior of subsonic jets by studying the condensation process and hydrodynamic pressure oscillations, when the steam was discharged into a subcooled water pool.…”

“…They proposed a semi-empirical correlation for the heat transfer coefficient based on nozzle diameter. A rational correlation was also developed for the estimation of interfacial area expressed Condensation rate during necking is governed by the heat transfer in the steam region Average heat transfer for subsonic jets is about one-fifth to one-tenth of the sonic jet values Jeje et al (1990) High speed photographyh…”

“…The average heat transfer for subsonic jets was reported to be one-fifth to one-tenth of the sonic jet values. Jeje et al (1990) carried out experiments using the high speed photography and frequency measurements on the growth of vapor-liquid interfaces dominated by both inertial and thermal effects. Convective HTCs at the evolving vapor-liquid interfaces varied with the bubbling regime and with the stage of interface growth, and were as high as 2.4 MW/m 2 K without the pool of water being agitated.…”

Effect of Flow Structures on Heat Transfer in Single and Multiphase Jet Reactors

“…Much of the published work focuses on evaluating the plume dimensions, condensation flow regime maps, and temperature profiles in reactors for various geometric and operating conditions (nozzle diameter, nozzle upstream pressure, initial reactor temperature, reactor volume, etc). Semiempirical correlations ,− have also been proposed for the calculation of average condensation HTC in the vicinity of plume (i.e., VL interface). The average HTC reported in literature is in the range of 0.1−4 MW/(m 2 K).…”