Critical heat flux for SiC- and Cr-coated plates under atmospheric condition

Kam, Dong Gun; Lee, Jong Hyuk; Lee, Taeseung; Jeong, Yong Hoon

doi:10.1016/j.anucene.2014.09.046

Cited by 56 publications

(10 citation statements)

References 18 publications

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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

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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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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

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“…The pool boiling experiments in Reference 22 indicate that CHF is enhanced with SiC coating and this enhancement increases with increasing thickness of the SiC layer. This is due to the hydrophilic properties of SiC [22]. CHF was enhanced with SiC even though the surface roughness was similar for all of the plates in the experiment, which included Cr-coated Zircaloy, Zircaloy, and stainless steel plates.…”

Section: Pool Boiling Chf On Silicon Carbide and Chromium Coated Zircmentioning

confidence: 93%

“…One set of recent experiments from the literature includes pool-boiling experiments with SiCand Cr-coated Zircaloy plates [22]. The SiC-coated plates were produced using physical vapor deposition sputtering and the Cr-coated plates were produced using an electroplating process on the surface of the Zircaloy cladding.…”

Section: Pool Boiling Chf On Silicon Carbide and Chromium Coated Zircmentioning

confidence: 99%

Survey of Thermal-Fluids Evaluation and Confirmatory Experimental Validation Requirements of Accident Tolerant Cladding Concepts with Focus on Boiling Heat Transfer Characteristics

Brown

Wysocki

Terrani

et al. 2016

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The U.S. Department of Energy Office of Nuclear Energy (DOE-NE) Advanced Fuels Campaign (AFC) is working closely with the nuclear industry to develop fuel and cladding candidates with potentially enhanced accident tolerance, also known as accident tolerant fuel (ATF). Thermal-fluids characteristics are a vital element of a holistic engineering evaluation of ATF concepts. One vital characteristic related to boiling heat transfer is the critical heat flux (CHF). CHF plays a vital role in determining safety margins during normal operation and also in the progression of potential transient or accident scenarios. This deliverable is a scoping survey of thermal-fluids evaluation and confirmatory experimental validation requirements of accident tolerant cladding concepts with a focus on boiling heat transfer characteristics. The key takeaway messages of this report are: 1. CHF prediction accuracy is important and the correlations may have significant uncertainty. 2. Surface conditions are important factors for CHF, primarily the wettability that is characterized by contact angle. Smaller contact angle indicates greater wettability, which increases the CHF. Surface roughness also impacts wettability. Results in the literature for pool boiling experiments indicate changes in CHF by up to 60% for several ATF cladding candidates. 3. The measured wettability of FeCrAl (i.e., contact angle and roughness) indicates that CHF should be investigated further through pool boiling and flow boiling experiments. 4. Initial measurements of static advancing contact angle and surface roughness indicate that FeCrAl is expected to have a higher CHF than Zircaloy. The measured contact angle of different FeCrAl alloy samples depends on oxide layer thickness and composition. The static advancing contact angle tends to decrease as the oxide layer thickness increases.

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“…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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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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Critical heat flux for SiC- and Cr-coated plates under atmospheric condition

Cited by 56 publications

References 18 publications

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

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

Survey of Thermal-Fluids Evaluation and Confirmatory Experimental Validation Requirements of Accident Tolerant Cladding Concepts with Focus on Boiling Heat Transfer Characteristics

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

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