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Improvement of solidification model and analysis of 3D channel blockage with MPS method

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Frontiers in Energy 2021年第4期15卷 946-958页

作者： Reo KAWAKAMI Xin LI Guangtao DUAN Akifumi YAMAJI Isamu SATO tohru suzuki Cooperative Major in Nuclear Energy Graduate School and Advanced Science and EngineeringFaculty of Science and EngineeringWaseda University3-4-1 OkuboShinjuku-kuTokyo169-8555Japan Department of Nuclear Engineering and Management The University of Tokyo7-3-1 HongoBunkyo-kuTokyo113-8656Japan Department of Nuclear Safety Engineering Faculty of EngineeringTokyo City University1-28-1 TamazutsumiSetagaya-kuTokyo158-0087Japan

In a severe accident of a nuclear power reactor,coolant channel blockage by solidified molten core debris may significantly influence the core degradations that follow.The moving particle semi-implicit(MPS)method is one of the Lagrangian-based particle methods for analyzing incompressible flows.In the study described in this paper,a novel solidification model for analyzing melt flowing channel blockage with the MPS method has been developed,which is suitable to attain a sufficient numerical accuracy with a reasonable calculation cost.The prompt velocity diffusion by viscosity is prioritized over the prompt velocity correction by the pressure term(for assuring incompressibility)within each time step over the“mushy zone”(between the solidus and liquidus temperature)for accurate modeling of solidification before fixing the coordinates of the completely solidified particles.To sustain the numerical accuracy and stability,the corrective matrix and particle shifting techniques have been applied to correct the discretization errors from irregular particle arrangements and to recover the regular particle arrangements,respectively.To validate the newly developed algorithm,2-D benchmark analyses are conducted for steady-state freezing of the water in a laminar flow between two parallel plates.Furthermore,3-D channel blockage analyses of a boiling water reactor(BWR)fuel support piece have been performed.The results show that a partial channel blockage develops from the vicinity of the speed limiter,which does not fully develop into a complete channel blockage,but still diverts the incoming melt flow that follows to the orifice region.

关键词： boiling water reactor(BWR) severe accident channel blockage moving particle semi-implicit(MPS)method solidification*

Enhanced hydrogen production from aqueous methanol solution using TiO2/Cu as photocatalysts

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Frontiers of Chemical Science and Engineering 2014年第2期8卷 197-202页

作者： Paramasivan GOMATHISANKAR Tomoko NODA Hideyuki KATSUMATA tohru suzuki Satoshi KANECO Department of Chemistry for Materials Graduate School of Engineering Mie University Mie 514-8507 Japan Environmental Preservation Center Mie University Mie 514-8507 Japan

The photocatalytic hydrogen production from aqueous methanol solution using titanium dioxide （TiO2） was investigated in the addition of metal particles including copper, lead, tin, and zinc. The results show that only the addition of copper particles enhances the hydrogen production. The copper usage and reaction temperature were further optimized for TiO2/Cu photocatalyts. Under the optimal conditions, the hydrogen production using TiO2/Cu as photocatalysts is approxi- mately 68 times higher than that obtained with only TiO2.

关键词： photocatalytic hydrogen generation metha-nol copper particles TiO2 metal-semiconductor interface

Indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with TiO_2 in the presence of hole scavengers

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Chinese Journal of Chemical Engineering 2018年第3期26卷 529-533页

作者： Abdus Samad Shamim Ahsan Ikki Tateishi Mai Furukawa Hideyuki Katsumata tohru suzuki Satoshi Kaneco Department of Chemistry Jagannath University Department of Earth and Atmospheric Sciences Metropolitan State University of Denver Department of Chemistry for Materials Graduate School of Engineering Mie University Mie Global Environment Center for Education & Research Mie University

The indirect photocatalytic reduction of arsenate to arsenite in aqueous solution with titanium dioxide(TiO_2)was investigated with various hole scavengers such as methanol, ethanol, 2-propanol, formaldehyde, acetone,formic acid and acetic acid. Although the direct photocatalytic reduction of arsenate to arsenite with TiO_2 was impossible, an indirect reduction of As(V) was possible in the presence of sacrificial electron donors to form strongly reductive radicals. The addition of ethanol was very effective for indirect photocatalytic reduction of As(V) in aqueous solution with TiO_2 photocatalyst. The indirect photocatalytic reduction rate of As(V) may be related with both the reaction rate constants of reaction of hydroxyl radicals with hole scavenger and the reactivities for the radicals M· which are produced by the reaction of ·OH with hole scavenger.

关键词：亚砷酸盐 TiO2 间接水反应率二氧化物光催化剂分子

Determination of aniline derivatives in water samples after preconcentration with oxidized multiwalled carbon nanotubes as solid-phase extraction disk

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Frontiers of Chemical Science and Engineering 2012年第3期6卷 270-275页

作者： Hideyuki KATSUMATA Yuta ODA Satoshi KANECO tohru suzuki Kiyohisa OHTA Department of Chemistry for Materials Graduate School of Engineering Mie University Tsu 514-8507 Japan Environmental Preservation Center Mie University Tsu 514-8507 Japan

A sensitive and selective preconcentration method using solid-phase extraction （SPE） disk made from oxidized multiwalled carbon nanotubes （OMWCNTs）, has been developed for the determination of aniline derivatives, such as 2-nitroaniline （2-NA）, 4- nitroaniline （4-NA）, and 2,4-dichloroaniline （2,4-DCA） in water samples. Anilines were extracted onto OMWCNT disk and then determined by high performance liquid chromatography （HPLC） with UV detector. Several parameters on the recovery of the analytes were investigated. The experimental results showed that it was possible to obtain quantitative analysis when the solution pH was 8 using 200 mL of validation solution containing 2 ug of anilines and 10 mL of acetonitrile/ethanol （8/2, v/v） as an eluent. Relative standard deviations for five determinations were 7.5% （2-NA）, 6.5% （4-NA） and 3.8% （2,4-DCA） under optimum conditions. The linear range of calibration curves were 0.5 ng.mL 1 to 15 ng.mL-1 for each analyte with good correlation coefficients. The detection limits （3S/N） of 2-NA, 4-NA and 31 pg.mL -1 and 26 pg.mL-1 was successfully applied to 2,4-DCA were 30pg.mL -1, respectively. Our method the determination of aniline compounds in fiver water sample with high precision and accuracy.

关键词： aniline determination solid-phase extraction,oxidized multiwalled carbon nanotubes water sample,HPLC-UV

Simultaneous removal of trihalomethanes by bimetallic Ag/Zn:kinetics study

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Frontiers of Chemical Science and Engineering 2010年第3期4卷 322-327页

作者： Ahmed H A DABWAN Satoshi KANECO Hideyuki KATSUMATA tohru suzuki Kiyoyuki EGUSA Kiyohisa OHTA Faculty of Chemical Engineering Technology Tati University CollegeJalan PanchorTeluk Kalong24000 KemamanTerengganuMalaysia Department of Chemistry for Materials Graduate School of EngineeringMie UniversityMie 514-8507Japan Environmental Preservation Center Mie UniversityMie 514-8507Japan

In the present work,bimetallic silver/zinc was applied into the degradation of trihalomethanes,THMs:CHCl_(3),CHBrCl_(2),CHBr_(2)Cl,and CHBr_(3).The kinetics reaction rates and removal efficiencies of the THM compound mixtures,in the aqueous solutions,were investigated.Batch experiments were conducted under mild conditions,ambient temperature,and pressure.The primary degradation reaction followed a pseudo-first-order kinetic law.The first-order rate constants and the degradation efficiencies followed the decreasing order of CHBr_(3)>CHBr_(2)Cl>CHBrCl_(2)>CHCl_(3).The bond dissociation energy and hydrophilic/hydrophobic characteristics of the THM compounds may become the most important parameters affecting the degradation kinetics and efficiency by bimetallic Ag/Zn.

关键词： degradation trihalomethanes bimetallic silver/zinc halogenated pollutants kinetics

Occurrence of Two Distinct types of Tissue Inhibitors of Metallo-proteinases-2 in Fugu rubripes

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Journal of Ocean University of China 2005年第3期4卷 214-218页

作者： Yoshihiro Yokoyama Hiroshi Tsukamoto tohru suzuki Shohshi Mizuta Reiji Yoshinaka Faculty of Biotechnology Fukui Prefectural University JapanFaculty of Biotechnology Fukui Prefectural University JapanGraduate School of Agricultural Science Tohoku University JapanFaculty of Biotechnology Fukui Prefectural University JapanFaculty of Biotechnology Fukui Prefectural University Japan

In this study, genes of two distinct tissue inhibitors of metalloproteinases-2 (TIMP-2) from Japanese puffer fishFugu rubripes, Fugu TIMP-2a and TIMP-2b, were cloned. The open reading frames of Fugu TIMP-2a and TIMP-2b cDNAsare composed of 660 and 657 nucleotides and 220 and 219 amino acids, respectively. Both Fugu TIMP-2s contain 12 cysteineresidues, which might form six disulfide bonds as in other animals’ TIMP-2s. Reverse-transcribed polymerase chain reactionanalysis showed the mRNAs of Fugu TIMP-2a and TIMP-2b to be expressed in some tissues examined with different expres-sion patterns. These findings suggest that the two distinct Fugu TIMP-2s might perform different functions in Fugu tissues.

关键词：河豚蛋白酶抑制剂稳定性多样性

Optimization of Conditions for the Photocatalytic Degradation of EDTA in Aqueous Solution with Fe-Doped Titanium Dioxide

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Open Journal of Inorganic Non 2014年第3期4卷 28-34页

作者： Tomoki Sugiyama Ahmed H. A. Dabwan Hideyuki Katsumata tohru suzuki Satoshi Kaneco Department of Chemistry for Materials Graduate School of Engineering Mie University Mie Japan Mie Global Environment Center for Education & Research Mie University Mie Japan Research Center of Process for Environmental Load Reduction Mie University Mie Japan Department of Chemistry for Materials Graduate School of Engineering Mie University Mie Japan Research Center of Process for Environmental Load Reduction Mie University Mie Japan Gifu University Gifu Japan Mie Global Environment Center for Education & Research Mie University Mie Japan Research Center of Process for Environmental Load Reduction Mie University Mie Japan Research Management Center Tati University College Kemaman Terengganu Malaysia

The conditions for photocatalytic degradation of ethylenediaminetetraacetic acid (EDTA) in aqueous solution with Fe-doped titanium dioxide (TiO2) were optimized. The degradation efficiencies with Fe-doped TiO2 were better, compared with those obtained with bare TiO2 and Pt-doped TiO2. The effect of various experimental factors, such as photocatalytic dosage, temperature, solution pH and light intensity on the photocatalytic degradation of EDTA by Fe-doped TiO2 was investigated. The photocatalytic degradation treatment for the wastewater containing EDTA is simple, easy handling and low cost.

关键词： EDTA Fe-Doped TioEDTA Fe-Doped TiO2 Photocatalytic Degradation Wastewater Treatment Radioactive Liquid Waste

Evaluation of Reaction Mechanism for Photocatalytic Degradation of Dye with Self-Sensitized TiO<sub>2</sub>under Visible Light Irradiation

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Open Journal of Inorganic Non 2017年第1期7卷 1-7页

作者： Md. Ashraful Islam Molla Ikki Tateishi Mai Furukawa Hideyuki Katsumata tohru suzuki Satoshi Kaneco Department of Chemistry for Materials Mie University Mie Japan Mie Global Environment Center for Education and Research Mie University Mie Japan

The dye-sensitized TiO2 method is one of the most promising methods for the visible-light-induced detoxification of pollutants. The reaction mechanism for photocatalytic degradation of orange II (OII) and rhodamine B (RhB) with self-sensitized TiO2 under visible light irradiation (λ > 400 nm) has been evaluated. Radical scavenger studies were carried out to investigate the active species involved in the photodegradation of 5 mg/L of initial concentration of OII and RhB at room temperature. The trapping effects of different scavengers results proved that the oxidation of OII and RhB mainly occurred by the direct oxidization of h+ and ·O2- radicals, while the ·OH radicals played only a relatively minor role in the direct oxidization process.

关键词： TiO2 Photocatalytic Degradation Visible Light Dye-Sensitization Reaction Mechanism

Enhanced Photocatalytic Degradation of Bisphenol A in Aqueous Solution by Ag-Doping ZnO

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Open Journal of Inorganic Non 2016年第3期6卷 13-17页

作者： Nobuyuki Hoshiyama Ahmed H. A. Dabwan Hideyuki Katsumata tohru suzuki Mai Furukawa Satoshi Kaneco Department of Chemistry for Materials Graduate School of Engineering Mie University Mie Japan Faculty of Chemical Engineering Technology Tati University College Kemaman Malaysia Mie Global Environment Center for Education & Research Mie University Mie Japan

The metal-doping into the photocatalyst was evaluated for the photocatalytic degradation of bisphenol A in aqueous solution with ZnO powder. Au/ZnO, Ag/ZnO and Cu/ZnO were tested in the present work. Ag-doping ZnO was effective for the improvement of efficiency for the photocatalytic degradation of bisphenol A in water. The optimum doping concentration of silver was found to be 3 wt%. The pseudo first-order rate constant with 3 wt% Ag/ZnO was 1.3 times better compared with bare ZnO. The photocatalytic degradation of treatment for the wastewater containing bisphenol A is simple, easy handling and low cost.

关键词： ZnO Ag-Doping Bisphenol A Wastewater Treatment Photocatalytic Degradation