Surface wettability and pool boiling Critical Heat Flux of Accident Tolerant Fuel cladding-FeCrAl alloys

Ali, Amir F.; Gorton, Jacob P.; Brown, Nicholas R.; Terrani, Kurt A.; Jensen, Colby; Lee, Youho; Blandford, Edward D.

doi:10.1016/j.nucengdes.2018.08.024

Cited by 39 publications

(5 citation statements)

References 33 publications

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“…The wettability and roughness can have an impact on CHF occurrence. Although in the flow boiling studies from Haas [20] and Lee [21] no dependencies of wettability on CHF have been found, a positive impact was observed during pool boiling experiments by O'Hanley [1], Ali [4] and Son [3]. In this work the differences in wettability were characterized by contact angle and summarized in Table 6.…”

Section: The Effect Of Wettability and Roughnessmentioning

confidence: 72%

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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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Section: The Effect Of Wettability and Roughnessmentioning

confidence: 72%

“…Pool boiling studies showed a strong agreement on the impact of surface morphology on CHF. It can be seen in the work of O'Hanley et al [1], Seo et al [2], Son et al [3], Ali et al [4], Kam et al [5] and Liang et al [6].…”

Section: Introductionmentioning

confidence: 91%

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

et al. 2020

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“…The experimental facilities can be usually easily maintained and therefore they have been carried out on lots of different materials. The results of pool boiling experiments show strong agreement on the impact of surface morphology on CHF [1], [2], [3], [4]. The flow boiling experiment traditionally considers pressure, mass flow and inlet subcooling as major factors assuming that the impact of the material is limited [5].…”

Section: Introductionmentioning

confidence: 83%

Experimental Investigation of Critical Heat Flux in Annulus at Low Pressure and Low Flow Parameters

Vlček

Suk

Števanka

et al. 2020

APP

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Steady state flow boiling experiments were conducted on a technically smooth Inconel 625 tube with outer diameter 9.1 mm at inlet pressures 131, 220 and 323 kPa, inlet temperatures 62, 78 and 94 °C and approximately 400, 600 and 1000 kg/(m2.s) mass flow. Water of these parameters was entering into the vertically aligned annulus, where the uniformly heated tube was placed until the critical heat flux (CHF) appeared. The experimental data were compared to estimations of CHF by local PGT tube correlation and Groeneveld’s look-up tables for tubes. The results imply that in the region of low pressure and low mass flux, the differences between calculations and experiments are substantial (more than 50 % of CHF). The calculations further imply that look-up tables and tube correlations should be corrected to the annulus geometry. Here, the Doerffer’s approach was chosen and led to a substantial enhancement of CHF estimation. Yet, a new correlation for the region of low pressure and flow is needed.

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“…As Equation (2) to Equation (6) show, the growth of the oxide scale requires the continuous diffusion of Al and O. It is generally believed that the elements are more likely to diffuse in defects (vacancies and cracks) and grain boundaries [ 25 , 26 , 27 ]. As Figure 2 and Figure 4 show, the oxide scale of the Fe-Cr-Al specimen was more dense and thicker, and there were more cracks and porosity than in the Fe-Cr-Al ODS specimen.…”

Section: Discussionmentioning

confidence: 99%

High-Temperature Oxidation Properties and Microstructural Evolution of Nanostructure Fe-Cr-Al ODS Alloys

Chen

Zhang

et al. 2021

Materials

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The oxidation behavior and microstructural evolution of the nanostructure of Fe-Cr-Al oxide dispersion strengthened (ODS) alloys prepared by spark plasma sintering were investigated by high-temperature oxidation experiments in air at 1200 °C for 100 h. The formation of Al2O3 scale was observed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDS) line scans. The oxidation rate of Fe-Cr-Al ODS alloys is lower than that of conventional Fe-Cr-Al alloys, and the oxide layer formed on the Fe-Cr-Al alloy appeared loose and cracked, whereas the oxide layer formed on the Fe-Cr-Al ODS alloys was adherent and flat. This is due to the high density of dispersed nano-oxides hindering the diffusion of Al element and the formation of vacancies caused by them. In addition, the nano-oxides could also adhere to the oxide layer. Besides, the microstructure of the Fe-Cr-Al ODS alloy had excellent stability during high-temperature oxidation.

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Surface wettability and pool boiling Critical Heat Flux of Accident Tolerant Fuel cladding-FeCrAl alloys

Cited by 39 publications

References 33 publications

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

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

Experimental Investigation of Critical Heat Flux in Annulus at Low Pressure and Low Flow Parameters

High-Temperature Oxidation Properties and Microstructural Evolution of Nanostructure Fe-Cr-Al ODS Alloys

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