Flow Boiling Critical Heat Fluxes for Water in a Vertical Annulus at Low Pressure and Velocities

Rogers, J. T.; Salcudean, M.; Tahir, A.

doi:10.1615/ihtc7.1180

Cited by 23 publications

(7 citation statements)

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“…Much research has been done which is only applied to investigating the mass flow velocity on CHF in internally heated annuli and found that the CHF monotonically increased with the increase of mass flow velocity remarkably (Chun et al, 2001a;Roger et al, 1982;El-Genk et al, 1988;El-Genk and Rao, 1991). In this study, the variation of the CHF with mass flow velocity is shown in Fig.…”

Section: The Effect Of the Mass Flow Velocity On Chfmentioning

confidence: 82%

Experimental study on critical heat flux in bilaterally heated narrow annuli

Qiu

et al. 2009

International Journal of Multiphase Flow

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Section: The Effect Of the Mass Flow Velocity On Chfmentioning

confidence: 82%

Experimental study on critical heat flux in bilaterally heated narrow annuli

Qiu

et al. 2009

International Journal of Multiphase Flow

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“…The CHF occurrence does not need to be only at the top end axial position in accordance with a simplified physical model, which takes into account smaller fluid quality, greater enthalpy together with lower pressure. Although the vast amount of experiments support this model i.e., Rogers et al [13], El-Genk [14] and Haas [9] using small annulus, however, there are several examples of exceptions, where the CHF occurred in lower positions. Schoesse [15], Fiori [12], Mayer [17] and Haas [9] with large annulus spotted minor number of CHF at lower axial positions.…”

Section: Axial Position Of Critical Heat Fluxmentioning

confidence: 93%

“…Fiori and Bergles [12] investigated CHF in annular geometry at low pressures of 148-600 kPa and using an outer glass tube, they observed flow regimes during experiments. Rogers [13], El-Genk [14] and Schoesse [15] investigated CHF at constant pressures of 156, 118 and 128 kPa at different mass fluxes. Mishima and Nushihara [16] focused on very low subcooling of inlet water at a pressure of 100 kPa.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Critical Heat Flux on Different Surfaces at Low Pressure and Low Flow

et al. 2020

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Steady state flow boiling experiments were carried out on several heated tubes with outer diameter 9.14 mm at outlet pressures 120, 200 and 300 kPa, inlet temperatures 64, 78 and 91 °C and approximately 400, 500, 600 and 800 kg/(m2·s) mass flux entering the vertically aligned test annulus until critical heat flux (CHF) was reached. The tubes were made of Inconel 625 with a length of 400 mm. The Inconel tubes were tested in three different modifications as smooth, abraded with 150 grit sandpaper and bead blasted. Multiple experiments were repeated on the same specimen to investigate the effect of surface characteristic changes (i.e., wettability, roughness and oxide layer morphology) on the occurrence of CHF. Despite the changes in initial wettability, the CHF dependency was not clearly observed, however, the changes in roughness led to an increase in CHF. The total number of 115 experimental runs were collected and the results were also compared with other literature experimental data.

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“…Another investigation was done by Fiori and Bergles [9] who researched CHF in annular geometry at low pressures of 148-600 kPa. Experiments at pressures slightly above atmospheric pressure were done by El-Genk [10], Schoesse [11] and Rogers [12]. Each experiment at different mass fluxes but constant pressures of 118, 128 and 156 kPa, respectively.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Critical Heat Flux on Abraded Inconel 625 Tube

Suk

Števanka

Petrosyan

et al. 2020

APP

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Aim of this work was to study flow boiling in an annular channel at low pressure and low flow on a tube with modified surface roughness. The tube with the outer diameter of 9.14 mm and the heated length of 380 mm was made of Inconel 625 and was manually modified using 150 grit sandpaper. The tube was placed in a glass tube with an inner diameter of 14.8 mm. Outlet pressure was set to 120, 200 and 300 kPa with varying mass flow from 400 to 600 kg/(m2.s). A high speed camera was used to record several experiments to fully understand ongoing phenomena. Surface roughness was analysed using a confocal laser microscope and the effects of different mass flux and pressure on the CHF value were observed. Above all, the optimization of the flow parameters was done from the collected data and from the observed behaviour of the experimental loop.

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Flow Boiling Critical Heat Fluxes for Water in a Vertical Annulus at Low Pressure and Velocities

Cited by 23 publications

References 0 publications

Experimental study on critical heat flux in bilaterally heated narrow annuli

Experimental study on critical heat flux in bilaterally heated narrow annuli

Experimental Investigation of Critical Heat Flux on Different Surfaces at Low Pressure and Low Flow

Investigation of Critical Heat Flux on Abraded Inconel 625 Tube

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