Critical heat flux through curved, downward facing, thick walls

Theofanous, T.G.; Syri, Sanna; Salmassi, T.; Kymäläinen, Olli; Tuomisto, H.

doi:10.1016/0029-5493(94)90046-9

Cited by 70 publications

(13 citation statements)

References 3 publications

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“…8, the prediction of CHF for the hemisphere of large diameter by Eq. (15) describes well the experimental results (3) both qualitatively and quantitatively. In the hemisphere with medium-size diameter, the predicted CHF values by Eq.…”

Section: Extension To Hemispherical Surfacesupporting

confidence: 73%

“…6. As an example of the experimental condition reported by Theofanous et al (3) , the length of the arc along the hemisphere per 1 degree is 30.7 mm on a hemispherical heater with a radius of 1.76 m. Thus, the local CHF at θ on the hemisphere is given by:…”

Section: Extension To Hemispherical Surfacementioning

confidence: 92%

“…(16) for the hemisphere with medium-size diameter are represented by two horizontal dashed lines for an organic liquid. In this figure, the experimental results reported by Theofanous et al (3) , Haddad and Cheung (5) and Howard and Mudawar (6) are shown for comparison. The prediction by the correlation presented by Guo and El-Genk (13) for saturated water is also shown in Fig.…”

Section: Extension To Hemispherical Surfacementioning

confidence: 95%

“…8. The CHF data presented by Theofanous et al (3) were conducted by using a downward-facing hemispherical surface with a radius of 1.76 m. Those by Haddad and Cheung (5) were obtained for a hemispherical heater with a radius of 0.153 m. The CHF data obtained by Howard and Mudawar (6) were for a convex surface with a radius of 0.1026 mm. As seen from Fig.…”

Section: Extension To Hemispherical Surfacementioning

confidence: 99%

“…Howard and Mudawar (2) examined CHF trigger mechanisms through experiments and visualizations, and proposed the CHF model based on Kelvin-Helmholtz instability for an inclined plate. Theofanous et al (3) reported the experimental data of CHF distribution on a hemispherical surface with a radius of 1.76 m and presented the correlation of the CHF distribution on the hemispherical surface with the surface orientation. Furthermore, Theofanous et al (4) pointed out through numerical simulations that a vapor lens, i.e., a vapor dome, formed on the hemispherical surface was important for attaining CHF.…”

Section: Introductionmentioning

confidence: 99%

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Study on Ex-Vessel Cooling of Reactor Pressure Vessel (Model Analysis of Critical Heat Flux on Inclined Plate and Hemisphere Facing Downward)

Ohtake

Koizumi

2004

JSME international journal. Ser. B, Fluids and thermal engineer

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Critical heat fluxes (CHFs) on inclined plates and hemispheres in the case of saturated pool boiling were investigated analytically. In the present model, the most dangerous wavelength and propagation velocity in the Kelvin-Helmholtz instability on the liquid-vapor interface were calculated to determine the length and the velocity of the coalesced bubbles at CHF. The time period for which the coalesced bubble covered the heated surface was calculated as the length divided by the velocity. In close to the surface oriented downward, the characteristic length was provided by the length of the heater; the characteristic velocity was given by the correlation of the rising velocity of a spherical cap bubble with 17 to 40 mm the equivalent diameter. The predictions agreed well with previous experimental data obtained for an inclined plate in overall inclination angle. The model given as a function of the inclination angle was developed for the CHF on a hemisphere. The extended model well represented the experimental data on hemispheres.

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Section: Extension To Hemispherical Surfacesupporting

confidence: 73%

Section: Extension To Hemispherical Surfacementioning

confidence: 92%