Pool film boiling from spheres to saturated and subcooled liquids of Freon-12 and Freon-22

Tso, C.P.; Low, H.G.; Ng, Sor-Tho

doi:10.1016/0142-727x(90)90010-9

Cited by 15 publications

(4 citation statements)

References 9 publications

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“…E.A.6 in the Electronic Annex). We calculated the vapor film thickness around the sphere during film boiling using the analytical model of Tso et al (1990), and found that the film thickness at the bottom of the sphere is quite comparable with the length scale of the nanoparticle deposits. Therefore, the thin vapor film could be disturbed by such deposits.…”

Section: Data Interpretationmentioning

confidence: 98%

On the quenching of steel and zircaloy spheres in water-based nanofluids with alumina, silica and diamond nanoparticles

Kim

Dewitt

McKrell

et al. 2009

International Journal of Multiphase Flow

179

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Section: Data Interpretationmentioning

confidence: 98%

On the quenching of steel and zircaloy spheres in water-based nanofluids with alumina, silica and diamond nanoparticles

Kim

Dewitt

McKrell

et al. 2009

International Journal of Multiphase Flow

179

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“…As a result, they are provided with a levitation force by the generated vapor layer. This solid-liquid film boiling (or liquid-liquid film boiling) is usually caused by a huge temperature distinction between adjacent substances (3)(4)(5)(6)(7). Film boiling, also referred to as the Leidenfrost effect, generally impedes the heat transfer between neighboring materials due to the big thermal resistance induced by evaporated vapor layer (8,9).…”

mentioning

confidence: 99%

Vitrification and levitation of a liquid droplet on liquid nitrogen

Song

Adler

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

127

117

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The vitrification of a liquid occurs when ice crystal formation is prevented in the cryogenic environment through ultrarapid cooling. In general, vitrification entails a large temperature difference between the liquid and its surrounding medium. In our droplet vitrification experiments, we observed that such vitrification events are accompanied by a Leidenfrost phenomenon, which impedes the heat transfer to cool the liquid, when the liquid droplet comes into direct contact with liquid nitrogen. This is distinct from the more generally observed Leidenfrost phenomenon that occurs when a liquid droplet is self-vaporized on a hot plate. In the case of rapid cooling, the phase transition from liquid to vitrified solid (i.e., vitrification) and the levitation of droplets on liquid nitrogen (i.e., Leidenfrost phenomenon) take place simultaneously. Here, we investigate these two simultaneous physical events by using a theoretical model containing three dimensionless parameters (i.e., Stefan, Biot, and Fourier numbers). We explain theoretically and observe experimentally a threshold droplet radius during the vitrification of a cryoprotectant droplet in the presence of the Leidenfrost effect.

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“…The authors tentatively propose this method for film boiling around a vertical finite-length cylinder with a convex hemispherical bottom as the effect of diameter and length of the test cylinder are not included in the correction. Incidentally, Tso et al [4] have reported that it is necessary to multiply the analytical solution by a Fig. 10.…”

Section: Comparison Of Predicted With Experimental Resultsmentioning

confidence: 98%

“…where both h A1 is given by Tso et al [4] for the saturated and subcooled film boiling from a sphere where the two-phase boundary layer theory is adopted and the average heat transfer coefficient on the side surface h _ A2 is given by Nishikawa et al [5] based on the two-phase boundary layer theory. The heat transfer coefficient for the wavy vapor-liquid interface on the part of the upper end h _ B is estimated by referring to a vapor-film-unit model proposed by Nishio and Ohtake [3] and h _ C by the Hamill-Baumeister correlation [6] using the method proposed by the authors [2].…”

Section: Estimation Of Wall Heat Fluxmentioning

confidence: 99%

Film boiling heat transfer around a vertical finite‐length cylinder with a convex hemispherical bottom

Yamada

Toyoda

Shigechi

et al. 2010

Heat Trans. Asian Res.

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The film boiling heat transfer around a vertical silver cylinder with a convex hemispherical bottom was investigated experimentally in quiescent water at atmospheric pressure. The experiments have been carried out using a quenching method. The diameter and length of the test cylinder are 32 mm and 48 mm, respectively. The test cylinder was heated to about 600 °C in an electric furnace and then cooled in saturated or subcooled water with an immersion depth of about 100 mm. The degree of liquid subcooling was varied from 0 K to 30 K. The analytical solutions for saturated and subcooled boiling are obtained by applying a two-phase boundary layer theory for vapor film with a smooth interface. The experimental data correlates within ±15% based on the proposed prediction method. Also, the lower limit of film boiling was examined in terms of wall heat flux and degree of superheating.

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Pool film boiling from spheres to saturated and subcooled liquids of Freon-12 and Freon-22

Cited by 15 publications

References 9 publications

On the quenching of steel and zircaloy spheres in water-based nanofluids with alumina, silica and diamond nanoparticles

On the quenching of steel and zircaloy spheres in water-based nanofluids with alumina, silica and diamond nanoparticles

Vitrification and levitation of a liquid droplet on liquid nitrogen

Film boiling heat transfer around a vertical finite‐length cylinder with a convex hemispherical bottom

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