Nuclear Materials and Energy
·
2021
·
IF 2.32
S. Krat,Yu. Gasparyan,Ya. Vasina,A. Prishvitsyn,G.De Temmerman,A. Pisarev
Available literature data for beryllium content in D-Be co-deposited layers was modeled using newly developed model. It was shown that the model adequately describes the experimental results. An empirical scaling for the available trap concentrations as a function of deuteron energy was introduced in order to improve the agreement between the experimental data and model predictions. The limited recombination rate describes the co-deposition better than the unlimited one. Assuming two types of traps in the film with detrapping energies of 0.8–0.9 and 1.2–1.3 eV and trap concentrations of 10 at. % and 1 at. %, respectively, and the deuterium implantation energy of 15.6 eV, the average relative deviation between experimental and predicted D/Be values of 1.9 was observed, which is better than the empirical D/Be scalings.
研究领域:
核物理学
·
材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
·
2022
·
IF 4.779
Tao Wen,Jielin Luo,Kai Jiao,Lin Lu
Enhancing heat transfer performance of pool boiling is attractive in practical applications, while the utilization of nanofluid is regarded as an effective approach. However, existing knowledge of boiling enhancement with nanofluid is still limited in terms of the influences of its type, concentration, deposition and boiling time. In this paper, the pool boiling performance of a highly self-dispersion TiO 2 nanofluid with mass concentration from 0.0001% to 0.1% was experimentally investigated and compared with Al 2 O 3 and ZnO nanofluid. The effect of boiling-induced deposition layer was studied by means of repeatability test, wettability test and macro/micro morphology test. Results indicated that a super-hydrophilic micro-porous deposition layer formed on nanofluid boiling surface and led to nearly twice higher CHF than distilled water, and nanofluid itself had negligible influence on CHF enhancement. Increasing concentration of nanofluid led to occasional falling off of the deposition on surface and resulted in complicated and unpredictable boiling performance. Nanofluid type and concentration had limited influence on CHF, whose value kept around 1800 kW/m 2 . 0.0001% TiO 2 and Al 2 O 3 nanofluids had similar boiling curves, but ZnO nanofluid exhibited lower heat transfer coefficient . Finally, a novel criterion to predict the occurrence of film boiling in advance was proposed based on wall superheat change rate threshold. The present study will contribute to design guidance and security control of nanofluid-based pool boiling device.
研究领域:
工程热物理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Yisheng Hu,Zheng Liu,Fei Zhao,Dongdong Ji,Bailing Jiang,Mingyang Hu,Bo Ma,Ziyang Yan
The positive deposit layer is passivated to seriously affect the service life of soluble lead flow batteries . Based on the oxidation reaction of high valence Cobalt ions in the electrocatalytic OER process, Pb 2+ can be oxidized to form Pb 4+ that reduces the formation of the passivation layer. The hydroxyl radical adsorbed by Co 3/4+ is disaffiliated from the active site. It is conducive to the formation of lead dioxide . In this work, a dense and flat sedimentary layer is obtained on the carbon fiber by adding 5 mmol·L −1 of Co 2+ . The tartaric acid with a delocalized structure is used to improve the conductivity and reduce the impedance of the sediment layer. As a result, the average coulomb efficiency of the flow cell reaches 97.8 %, and its average energy efficiency is 80.9 % in 100 cycles. It would provide a theoretical basis for improving the cycle life of soluble lead flow batteries .
研究领域:
电化学
·
能源材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
·
2025
·
IF 4.4
Peng Feng,Donghai Xu,Gang Yin,Kunkun Song,Ruibo Wang,Zhiyuan Li,Pan Wang
This study investigated the corrosion behavior of 316 L (316LSS) and 304 (304SS) stainless steels under a Na 2 SO 4 deposition layer in supercritical water (SCW). The salt layer reduced oxide film densification versus pure SCW, with 304SS exhibiting more severe corrosion (e.g., pitting) due to the absence of Mo which resists pitting corrosion. Without the salt layer, oxide film thicknesses were 6.50 µm (316LSS) and 1.60 µm (304SS); in contrast, 6.52 µm and 9.33 µm, respectively, indicating thicker in SCW with the salt layer. At 723 K and 25 MPa, higher water density increased Ni/Fe ion solubilities, while the salt layer trapped these ions in the microenvironment between the layer and oxide film, generating a locally acidic and oxidizing environment via hydrolysis of Ni/Fe ions. This process accelerated metal ion leaching and oxide dissolution, further enhanced in the presence of SO 4 2- . Na 2 SO 4 deposition layer and SCW synergistically intensified corrosion in both alloys.
研究领域:
材料科学
·
腐蚀工程
✓ 已验证
产品关联
DOI
高影响因子
Nuclear Materials and Energy
·
2020
·
IF 2.213
S.A. Krat,A.S. Prishvitsyn,Ya.A. Vasina,Yu.M. Gasparyan,A.A. Pisarev
An improved diffusion based model for prediction of the hydrogen content in co-deposited layers depending on the deposition conditions (the properties of the material which is co-deposited with hydrogen, rate of deposition, hydrogen flux and particle energy, substrate temperature) is presented. The model is validated using experimental data for W, Mo and Al, and is compared to empirical scaling equations currently in use. It is shown that a good agreement is observed in regards to hydrogen content vs substrate temperature experimental data, and no disagreement with scaling equations can be seen in regards to the role of hydrogen flux and the rate of deposition. It is shown that the influence of hydrogen particle energy on the hydrogen content requires further investigation. In addition to hydrogen, models for other mobile impurities both in co-deposited layers and in layers under steady-state net erosion conditions are given.
研究领域:
材料科学
·
表面科学
·
核聚变技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）