start-ver=1.4
cd-journal=joma
no-vol=65
cd-vols=
no-issue=13
article-no=
start-page=2097
end-page=2104
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=20251215
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Heat Transfer Enhancement by Forming Bridges among Reactive Particles in a Packed Bed Reactor of a Solid-gas Chemical Heat Storage System
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=In this study, the enhancement of the thermal output of solid-gas chemical heat storage systems was investigated. Bridges made of high-thermal conductivity materials were formed among reactive particles by drying a slurry which contained graphite powder as a thermal additive and dispersant in a packed-bed reactor. First, the effect of the volume ratio of the dispersant on effective thermal conductivity was investigated. The optimum volume ratio of dispersant to graphite powder was determined. Furthermore, repetitive bridge formation increased the effective thermal conductivity. Based on these results, we investigated the thermal response of the energy-discharge process. Consequently, the temperature distribution in the radial direction of the reactor decreased owing to the formation of bridges. In addition, the thermal energy generated by the adsorption of water vapor onto the adsorbent was effectively transferred to the reactor wall. The thermal output was estimated based on the experimental results. The thermal output was increased by the formation of bridges.
en-copyright=
kn-copyright=

en-aut-name=NakasoKoichi
en-aut-sei=Nakaso
en-aut-mei=Koichi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=ShimadaKenji
en-aut-sei=Shimada
en-aut-mei=Kenji
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=MinoYasushi
en-aut-sei=Mino
en-aut-mei=Yasushi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=GotohKuniaki
en-aut-sei=Gotoh
en-aut-mei=Kuniaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=Faculty of Environmental, Life Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=3
en-affil=Faculty of Environmental, Life Natural Science and Technology, Okayama University
kn-affil=

affil-num=4
en-affil=Faculty of Environmental, Life Natural Science and Technology, Okayama University
kn-affil=
en-keyword=chemical heat storage
kn-keyword=chemical heat storage
en-keyword=packed bed
kn-keyword=packed bed
en-keyword=bridge among particles
kn-keyword=bridge among particles
en-keyword=heat transfer enhancement
kn-keyword=heat transfer enhancement
en-keyword=effective energy utilization
kn-keyword=effective energy utilization
END

start-ver=1.4
cd-journal=joma
no-vol=40
cd-vols=
no-issue=2
article-no=
start-page=99
end-page=108
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=20250620
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=Evaluation of Drying Process of a Slurry Droplet Containing Water-soluble Polymer
kn-title=水溶性高分子含有スラリー液滴乾燥過程の評価
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The granulation process of a slurry droplet containing a water-soluble polymer in a spray dryer is investigated. Although there have been many studies on the drying behavior of a single-component slurry droplet, there have been few reports for a multicomponent slurry droplet. This is due to the complexity and difficulty in evaluating the drying behavior of a multicomponent slurry droplet. Therefore, for the production of granules from multicomponent materials by a spray dryer, its operating conditions are usually determined by trial and error. To optimize the practical granule production process, the drying behavior of multicomponent slurry droplets should be studied. In this study, the drying behavior of a silica slurry droplet containing polyvinyl alcohol (PVA) is investigated. The drying behavior of a droplet suspended on the tip of a needle was observed. The effect of the volume fraction of PVA on the drying behavior and the morphology of a dried granule is studied. The effect of drying condition on the granule formation process is also investigated. As a result, the structure of dried granules was strongly influenced by PVA concentration. Segregation of PVA in the dried granules was observed. Based on the results, the drying process diagram is presented.
en-copyright=
kn-copyright=

en-aut-name=NakasoKoichi
en-aut-sei=Nakaso
en-aut-mei=Koichi
kn-aut-name=中曽浩一
kn-aut-sei=中曽
kn-aut-mei=浩一
aut-affil-num=1
ORCID=

en-aut-name=YamashitaDaichi
en-aut-sei=Yamashita
en-aut-mei=Daichi
kn-aut-name=山下大智
kn-aut-sei=山下
kn-aut-mei=大智
aut-affil-num=2
ORCID=

en-aut-name=AoyamaYutaro
en-aut-sei=Aoyama
en-aut-mei=Yutaro
kn-aut-name=青山祐太郎
kn-aut-sei=青山
kn-aut-mei=祐太郎
aut-affil-num=3
ORCID=

en-aut-name=MinoYasushi
en-aut-sei=Mino
en-aut-mei=Yasushi
kn-aut-name=三野泰志
kn-aut-sei=三野
kn-aut-mei=泰志
aut-affil-num=4
ORCID=

en-aut-name=GotohKuniaki
en-aut-sei=Gotoh
en-aut-mei=Kuniaki
kn-aut-name=後藤邦彰
kn-aut-sei=後藤
kn-aut-mei=邦彰
aut-affil-num=5
ORCID=

affil-num=1
en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=岡山大学学術研究院環境生命自然科学学域

affil-num=2
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=岡山大学大学院自然科学研究科

affil-num=3
en-affil=Graduate School of Natural Science and Technology, Okayama University
kn-affil=岡山大学大学院自然科学研究科

affil-num=4
en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=岡山大学学術研究院環境生命自然科学学域

affil-num=5
en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University
kn-affil=岡山大学学術研究院環境生命自然科学学域
en-keyword=Spray Dryer
kn-keyword=Spray Dryer
en-keyword=Drying
kn-keyword=Drying
en-keyword=Droplet
kn-keyword=Droplet
en-keyword=Slurry
kn-keyword=Slurry
en-keyword=Water-Soluble Polymer
kn-keyword=Water-Soluble Polymer
END

start-ver=1.4
cd-journal=joma
no-vol=105
cd-vols=
no-issue=4
article-no=
start-page=045316
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2022
dt-pub=2022425
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Lattice Boltzmann model for capillary interactions between particles at a liquid-vapor interface under gravity
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=A computational technique based on the lattice Boltzmann method (LBM) is developed to simulate the wettable particles adsorbed to a liquid-vapor interface under gravity. The proposed technique combines the improved smoothed-profile LBM for the treatment of moving solid particles in a fluid and the free-energy LBM for the description of a liquid-vapor system. Five benchmark two-dimensional problems are examined: (A) a stationary liquid drop in the vapor phase; a wettable particle adsorbed to a liquid-vapor interface in (B) the absence and (C) the presence of gravity; (D) two freely moving particles at a liquid-vapor interface in the presence of gravity (i.e., capillary flotation forces); and (E) two vertically constrained particles at a liquid-vapor interface (i.e., capillary immersion forces). The simulation results are in good quantitative agreement with theoretical estimations, demonstrating that the proposed technique can reproduce the capillary interactions between wettable particles at a liquid-vapor interface under gravity.
en-copyright=
kn-copyright=

en-aut-name=MinoYasushi
en-aut-sei=Mino
en-aut-mei=Yasushi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=TanakaHazuki
en-aut-sei=Tanaka
en-aut-mei=Hazuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=NakasoKoichi
en-aut-sei=Nakaso
en-aut-mei=Koichi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=GotohKuniaki
en-aut-sei=Gotoh
en-aut-mei=Kuniaki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

en-aut-name=ShintoHiroyuki
en-aut-sei=Shinto
en-aut-mei=Hiroyuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=

affil-num=1
en-affil=Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=3
en-affil=Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=4
en-affil=Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=5
en-affil=Department of Chemical Engineering, Fukuoka University
kn-affil=
END

start-ver=1.4
cd-journal=joma
no-vol=101
cd-vols=
no-issue=3
article-no=
start-page=033304
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2020
dt-pub=20200313
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Lattice Boltzmann method for simulation of wettable particles at a fluid-fluid interface under gravity
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= A computational technique was developed to simulate wettable particles trapped at a fluid-fluid interface under gravity. The proposed technique combines the improved smoothed profile-lattice Boltzmann method (iSP-LBM) for the treatment of moving solid-fluid boundaries and the free-energy LBM for the description of isodensity immiscible two-phase flows. We considered five benchmark problems in two-dimensional systems, including a stationary drop, a wettable particle trapped at a fluid-fluid interface in the absence or presence of gravity, two freely moving particles at a fluid-fluid interface in the presence of gravity (i.e., capillary floatation forces), and two vertically constrained particles at a fluid-fluid interface (i.e., capillary immersion forces). The simulation results agreed well with theoretical estimations, demonstrating the efficacy of the proposed technique.
en-copyright=
kn-copyright=

en-aut-name=MinoYasushi
en-aut-sei=Mino
en-aut-mei=Yasushi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=ShintoHiroyuki
en-aut-sei=Shinto
en-aut-mei=Hiroyuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

affil-num=1
en-affil=Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Department of Chemical Engineering, Fukuoka University
kn-affil=
END

start-ver=1.4
cd-journal=joma
no-vol=95
cd-vols=
no-issue=4
article-no=
start-page=043309
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2017
dt-pub=20170425
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Effect of internal mass in the lattice Boltzmann simulation of moving solid bodies by the smoothed-profile method
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract= A computational method for the simulation of particulate flows that can efficiently treat the particle-fluid boundary in systems containing many particles was developed based on the smoothed-profile lattice Boltzmann method (SPLBM). In our proposed method, which we call the improved SPLBM (iSPLBM), for an accurate and stable simulation of particulate flows, the hydrodynamic force on a moving solid particle is exactly formulated with consideration of the effect of internal fluid mass. To validate the accuracy and stability of iSPLBM, we conducted numerical simulations of several particulate flow systems and compared our results with those of other simulations and some experiments. In addition, we performed simulations on flotation of many lightweight particles with a wide range of particle size distribution, the results of which demonstrated the effectiveness of iSPLBM. Our proposed model is a promising method to accurately and stably simulate extensive particulate flows.
en-copyright=
kn-copyright=

en-aut-name=MinoYasushi
en-aut-sei=Mino
en-aut-mei=Yasushi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=

en-aut-name=ShintoHiroyuki
en-aut-sei=Shinto
en-aut-mei=Hiroyuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=SakaiShohei
en-aut-sei=Sakai
en-aut-mei=Shohei
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=MatsuyamaHideto
en-aut-sei=Matsuyama
en-aut-mei=Hideto
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=Division of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University
kn-affil=

affil-num=2
en-affil=Department of Chemical Engineering, Fukuoka University
kn-affil=

affil-num=3
en-affil=Center for Membrane and Film Technology, Department of Chemical Science and Engineering, Kobe University
kn-affil=

affil-num=4
en-affil=Center for Membrane and Film Technology, Department of Chemical Science and Engineering, Kobe University
kn-affil=
END