Language：English   Publisher：Springer Nature  

In this study, a Pd-polymeric porous immobilized catalyst is prepared for the Suzuki–Miyaura coupling reactions by employing a Bayesian optimization method to optimize the catalyst. This research represents the first endeavor to utilize machine learning for the optimization of polymer-immobilized catalysts and provides a novel perspective on utilizing machine learning for the optimization of complex materials.

CiNii Research

Language：Japanese   Publisher：The Imaging Society of Japan  

<p>The dry process of a solution film enclosed with a cylindrical wall is numerically simulated to investigate the effect of solution-derived Marangoni flow on the deformation of the free surface. When no Marangoni flow occurs, drying of the liquid progresses while the free surface keeps a spherical cap. As a result, the free surface firstly reaches the center of the bottom surface, and subsequently forms a solid layer from the center toward the wall. When Marangoni flow occurs, Marangoni forces deform and flatten the free surface on the center. As the volume of the liquid decreases to 20%, cavities are developed near the wall. The cavities at a periphery of the solid layer were experimentally reported in the previous work. The calculations thus reveal the cavities results from Marangoni deformation. Moreover, the mechanism of lateral bulk flows derived by Marangoni deformation is discussed.</p>

DOI： 10.11370/isj.63.20

CiNii Research

Publisher：International Journal of Refrigeration  

This work investigated the generation of high-temperature steam by feeding saturated moist air through a steam generation system containing a zeolite 13X packed bed. The use of moist air was a unique aspect, which demonstrated a novel approach to steam generation system design. The issue with the steam generation system in previously existing published research works is that it needs high regeneration energy. In order to solve this issue, it is desirable to employ moist air as the working medium. In order to better understand the physical processes involved, numerical modeling of zeolite energy storage was also performed in addition to the experimental work. As the result, when the temperature of the moist air was raised from 30 to 95 °C, the maximum temperature of the resulting water vapor reached to about 200 °C. The maximum temperature of the water vapor was not greatly affected by the superficial velocity of the moist air between 0.108 and 0.216 mN/s. In the case that the moist air temperature was high, the maximum temperature of water vapor could be predicted based on correlations between the heat balance and adsorption equilibrium, assuming that temperatures of the moist air and zeolite were identical. The numerical technique also included a comparison between Arrhenius and linear driving force models. At higher temperature input moist air, both models resulted the close tendency.

DOI： 10.1016/j.ijrefrig.2023.04.025

Web of Science

Scopus

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1016/j.ijheatmasstransfer.2022.123798

Language：English   Publishing type：Research paper (scientific journal)  

DOI： https://doi.org/10.1016/j.ijrefrig.2023.04.025

Publisher：International Journal of Heat and Mass Transfer  

Although adsorption heat pump systems consist of adsorption and regeneration processes, almost no reported work has investigated regeneration in detail for a packed bed of zeolite particles. Here, we conducted experimental and theoretical analyses on the effects of temperature, dew point, and the flow velocity of high-temperature moist air on the regeneration rate. Normal superficial velocities of 0.108, 0.216, and 0432 mN/s, and inlet temperatures of 140 and 200 °C with various dew point temperatures were examined. Originally, the purpose was to make saturated steam of 180 °C or higher from factory waste heat of 100°C or lower. Regeneration of the zeolite particle layer with high-temperature moist air was analyzed with respect to the effect of air conditions. Numerical simulations of zeolite energy storage were performed using a one-dimensional adsorbent regeneration model. Practical applications of the numerical model were also examined. A sufficient regeneration rate was obtained by raising the temperature, even when environmental air was used. Significant improvements were obtained at a 0.432-mN/s normal superficial velocity and a 200°C inlet temperature. In the particle layer containing only adsorbed water, dew point effects on the regeneration rate and temperature response were small at high temperatures. In the particle layer containing both adsorbed and free water, the effect of the dew point on the regeneration rate was also small. The heat pump efficiency decreased because of the increased dew point; however, the decrease in efficiency was mitigated by increasing the temperature.

DOI： 10.1016/j.ijheatmasstransfer.2022.123798

Web of Science

Scopus

Language：Japanese   Publisher：Hosokawa Powder Technology Foundation  

<p>This study was conducted to reveal the relationship between properties of porous membrane and process conditions, when membrane is manufactured via wetting process. Membrane in this study was manufactured using two kind of carbon black (XC-72r and Li-100) which have different specific surface area. Time of ultrasonic dispersion to disperse carbon black and heating temperature to evaporate medium were process conditions to be changed. The thickness, permeability and surface roughness were measured for obtained membrane. As a result, permeability increased to the thickness in the case used Li-100. On the contrast, it was almost constant to the thickness for the case of XC-72r. Although the surface roughness did not depend on the thickness obviously, it became larger for the membrane used the slurry of bi-modal particle distribution for carbon black than used the slurry mono-modal. Consequently, it was revealed that the tendency of permeability and surface roughness to the membrane was understood by the morphology and particle distribution in slurry of carbon black.</p>

DOI： 10.14356/hptf.19108

CiNii Research

Language：Japanese   Publishing type：Research paper (scientific journal)  

Contribution of Combustion Air Preheating to Operation of an Industrial Waste Treatment Plant

DOI： https://doi.org/10.1252/kakoronbunshu.47.36

Language：English   Publishing type：Research paper (scientific journal)  

Aggregates of carbon black with various shapes in a suspension were investigated to understand their behavior in fluid flow. At a lower aspect ratio, the particles exhibited tumbling or rotational motion, and the fluid flow was deflected in regions where the density of particles was higher. The contact between the particles promoted partial particle grouping when the aspect ratios of the particles were low. The average transitional motion of the particles was greatest at the lowest aspect ratio case. This led to weaker rearrangement event than those when the particles were nearly spherical. The elongated particles could act as bridges to promote the formation of particle groups. We believe that our study provides insight for suspensions containing particles with various shapes, which can be used to control the suspensions Theologically.

DOI： 10.7317/pk.2019.43.5.741

Language：English   Publishing type：Research paper (scientific journal)  

Language：English   Publishing type：Research paper (other academic)  

A gas-liquid two phase flow is complicated and it has not been understood well thus far, in spite of extensive investigation. Numerical simulation is a potential approach to understand this phenomenon. Although a number of studies have been conducted to understand the behavior of bubbles on the basis of computational fluid dynamics (CFD), it is difficult to completely simulate a complicated three-phase flow, including coalescence and breakup of bubbles. Although the two-fluid model based on the semi-empirical model can well estimate the actual behavior of the system in which the equations are derived, the estimation over the applicable region of equations does not always agree with the actual result. Since the 1960s, various procedures have been proposed to directly track the free surface between two phases, for example, the adaptive mesh method and the particle method. Although each of these methods has certain advantages and disadvantages, the volume of fluid (VOF) method is the most acceptable method for capturing the free surface accurately and clearly. However, a concern related to this method is the maintenance of a constant volume of the fluid. In this study, a simulation code using the VOF method is developed in order to estimate the behavior of bubbles in a vertical pipe. Further, an offset of the volume fraction is introduced to stably calculate and minimize the volume fluctuation. The effect of the surface tension is also built into the program in order to estimate the behavior of the bubbles rising through the liquid medium. The simulations of the collapsed water column and a single rising bubble are conducted with the proposed simulation code. Consequently, we confirm that these results fairly agree with the experimental ones.

DOI： 10.1115/imece2011-63377

Language：Japanese   Publishing type：Research paper (scientific journal)  

抄録

新たなエネルギー資源として注目を集めているメタンハイドレートを深海底から回収する方法として提案されているガスリフト方式の回収管下端近傍に注目し，回収管下端近傍の流動場および回収される粒子の挙動を実験と解析から調べた．回収管下端近傍の海水の流れとハイドレート粒子の挙動をあらわす支配方程式を連成して解析できるように，差分法と離散要素法を用いた．回収管長さ1.5 m，管径0.05 mの実験室スケールでの実験値と解析値は妥当な範囲で一致した．また，実機システムの設計および操作条件を明らかにするために，実機スケールでのシミュレーション計算を行った．管径1 mのガスリフトシステムにおける最適な回収部形状として，かさの角度45°，かさの高さ0.4–0.6 mを得た．また実機システムの操作条件の指針として，ハイドレート層を0.1 m程度まで砕けばガスリフトシステムは経済的に十分成り立つことを示した．

Event date： 2018.5

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：札幌   Country：Japan  

Event date： 2017.10 - 2017.11

Language：English   Presentation type：Oral presentation (general)  

Country：United States  

Event date： 2012.2

Language：Japanese   Presentation type：Symposium, workshop panel (public)  

Venue：福岡   Country：Japan  

Event date： 2011.11

Language：English  

Venue：Denver   Country：United States  

Event date： 2011.10

Language：English  

Venue：kobe   Country：Japan  

Event date： 2010.12

Language：English  

Venue：Fukuoka, Japan   Country：Japan  

Event date： 2010.11

Language：English  

Venue：Fukuoka   Country：Japan  

Event date： 2010.10

Language：English  

Venue：Taipei   Country：Taiwan, Province of China  

Event date： 2010.4

Language：English  

Venue：Perth, Australia   Country：Japan  

Event date： 2009.12

Language：English  

Venue：Shanghai   Country：China  

Event date： 2009.10

Language：English  

Venue：Busang   Country：Korea, Republic of  

Event date： 2008.12

Language：English  

Venue：Saga, Japan   Country：Japan  

Event date： 2008.11

Language：English  

Venue：Taipei   Country：Taiwan, Province of China  

Event date： 2025.5

Language：English   Presentation type：Oral presentation (general)  

Venue：Okinawa Convention Center   Country：Japan  

Event date： 2023.3

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：東京農工大学 小金井キャンパス (E206)   Country：Japan  

Event date： 2022.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：信州大学 長野(工学)キャンパス (AC119)   Country：Japan  

Event date： 2022.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：信州大学 長野(工学)キャンパス (AB207)   Country：Japan  

Event date： 2022.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：信州大学 長野(工学)キャンパス (AB216)   Country：Japan  

Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン (LB103)   Country：Japan  

Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン (LF309)   Country：Japan  

Event date： 2021.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン (LF320)   Country：Japan  

Event date： 2020.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2020.12

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2020.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2020.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：オンライン   Country：Japan  

Event date： 2019.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Sapporo Convention Center   Country：Japan  

Event date： 2019.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Sapporo Convention Center   Country：Japan  

Event date： 2019.9

Language：English   Presentation type：Oral presentation (general)  

Venue：Sapporo Convention Center   Country：Japan  

Event date： 2018.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：鹿児島大学 郡元キャンパス   Country：Japan  

Event date： 2018.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：鹿児島大学 郡元キャンパス   Country：Japan  

Event date： 2017.11

Language：Japanese  

Venue：Busang   Country：Korea, Republic of  

Event date： 2017.9

Language：Japanese   Presentation type：Oral presentation (general)  

Venue：名古屋大学   Country：Japan  

Event date： 2010.3

Language：Japanese  

Venue：福岡   Country：Japan  

Event date： 2010.3

Language：Japanese  

Venue：鹿児島   Country：Japan  

Type：Peer review 

Number of peer-reviewed articles in foreign language journals：0

Number of peer-reviewed articles in Japanese journals：1

Proceedings of International Conference Number of peer-reviewed papers：0

Proceedings of domestic conference Number of peer-reviewed papers：0

Type：Competition, symposium, etc. 

Type：Peer review 

Number of peer-reviewed articles in foreign language journals：2

Number of peer-reviewed articles in Japanese journals：0

Proceedings of International Conference Number of peer-reviewed papers：0

Proceedings of domestic conference Number of peer-reviewed papers：0

Type：Competition, symposium, etc. 

Type：Competition, symposium, etc. 

Type：Peer review 

Number of peer-reviewed articles in foreign language journals：5

Number of peer-reviewed articles in Japanese journals：0

Proceedings of International Conference Number of peer-reviewed papers：0

Proceedings of domestic conference Number of peer-reviewed papers：0

Type：Peer review 

Number of peer-reviewed articles in foreign language journals：1

Number of peer-reviewed articles in Japanese journals：0

Proceedings of International Conference Number of peer-reviewed papers：1

Proceedings of domestic conference Number of peer-reviewed papers：0

Type：Competition, symposium, etc. 

Type：Peer review 

Number of peer-reviewed articles in foreign language journals：1

Number of peer-reviewed articles in Japanese journals：0

Proceedings of International Conference Number of peer-reviewed papers：0

Proceedings of domestic conference Number of peer-reviewed papers：0

Type：Competition, symposium, etc.