ALIAS  AZRI BIN

AZRI BIN, ALIAS

アズリ ビン, アリアス

AROUS Academic Repository of Okayama University of Science / 岡山理科大学学術リポジトリ

                               ｱｽﾞﾘ ﾋﾞﾝ ｱﾘｱｽ 氏 名 ・ ( 本 籍 )      AZRI BIN ALIAS  (マレーシア)  学 位 の 種 類      博士 (工学)  学 位 記 番 号      甲第工３８号      学位授与の日付   平成２５年９月１０日  学位授与の要件      学位規程第４条第３項該当(課程博士)  学位論文題目   Evaluation of Various Estimation Equations for  Particle-Fluid Interaction Forces and Modeling of Heat Transfer between Particles for DEM Simulation (DEM(離散要素法)シミュレーションのための各種粒子－ 流体間相互作用力推算式の検討と粒子間伝熱のモデル化)  論文審査委員   主査  准教授 桑木 賢也               副査  教授   高見 敏弘                            教授   丸山 祐一                               教授   平野 博之                               教授   柳瀬 眞一郎 (岡山大学)                －7－論 文 内 容 の 要 旨                           申請者氏名   AZRI BIN ALIAS     論文題目 EVALUATION OF VARIOUS ESTIMATION EQUATIONS FOR PARTICLE-FLUID INTERACTION FORCES AND MODELING OF HEAT TRANSFER BETWEEN PARTICLES FOR DEM SIMULATIONS The gas-solid two-phase flow takes a very important role in various industries such as medicine manufacturing, food processing, and combustion or gasification of coal.  Although these wide applications of the gas-solid two-phase flow have led to extensive researches, this phenomenon is very complicated and difficult to implement an experimental investigation of the flow characteristics.  On the other hand, not only the abilities of computers, but also the numerical algorithms to solve the phenomena coupled of fluid and particles have been developed.  As a result, numerical approaches have been introduced to design the powder processing industries.  The numerical simulations methods for two-phase flow are basically divided into three kinds of methods, which are the Two-Fluid Model (TFM), the Discrete Element Method (DEM) and Computational Fluid Dynamics (CFD) coupling model that is simply called as the DEM, and the Direct Numerical Simulation (DNS).  In the TFM, both gas phase and solid phase are treated as a fluid and solved by Eulerian method. The number of particles is not limited and it is also possible to analyze larger reactor relatively, as TFM can be incorporated into a lot of commercial code.  However, the particle adherence and the applicability to simulate various small scale phenomena in powder industry problem are difficult.  On the other hand, in the DEM-CFD coupling model.  The original DEM concept based was derived by Cundall and Strack in the field of geo-mechanics.  DEM was developed by Tsuji et al. by incorporating the CFD into the DEM. To distinguish the DEM from the original, they referred it as DEM + CFD model, but as write above, we will simply expressed it as DEM.  In the DEM, the motion of each particle is solved with Lagrangian method, and the motion equation for all particles needs to be solved.  Accordingly, the computational time of the DEM depends on the number of particles, and the computational load caused by the large number of particles sometimes brings serious problem.  In these two methods, some constitution equations for particle-gas interaction forces are also required. In addition, these two methods also cannot directly determine the small scale phenomena occurred around the particles such as drag, lift forces, viscous torque and also lubrication force. In such small scale phenomena in fluidized bed, it would be a necessary to use other method such as the DNS. The DNS method does not basically require any constitution equations for the particle-gas interaction forces.   So far, various methods for the DNS have been derived, e.g. the finite element method (FEM), the boundary-fitted coordinates systems (BFC), the volume of fraction method (VOF), and the Immersed －8－Boundary Method (IBM).   In this research, a study has been done in order to incorporate the equations for small scale phenomena in particle fluid interaction forces such as, drag, lift force, viscous torque, and also the heat transfer between the contacting particles with DEM.  In order to do that, we had utilized IBM that was proposed by Kajishima et. al. in our research.  At first, in order to validate whether IBM can calculate small scale phenomena, a study to calculate lift force (Saffman force and Magnus force) and viscous torque of a particle in a various gas-solid two-phase flow systems has been done.   An examination of various estimation equations for drag force also has been done. In a DEM simulation, for drag force calculations, Wen and Yu equation is often used when the particles are dilute, while the Ergun equation is adopted when particles are dense.  In a DEM simulation, these two equations are used interchangeably. However, there often exists a discontinuity between the two equations.  In this sections, the drag force acting on both dilute and dense particle are also studied.  In order to examine the effect of particle arrays and the relationship between the drag force and flow in a simple manner, particles were also arranged in a two–dimensional pattern.  In order to analyze the heat transfer in a fluidized bed using the DEM, we need to know (1) the particle-particle contact heat transfer, (2) the particle-gas heat transfer and (3) the particle-wall surface heat transfer.  For the particle-gas heat transfer (2), Ranz and Marshall equations is often used. In the other hands, as for particle-particle contact heat transfer (1) and particle-wall surface heat transfer (3), Rong and Horio assumed a gas membrane between contact planes and calculated with the heat conduction equation, i.e. Fourier‘s law. However, the actual contact area i.e. the particle surface has surface roughness. Accordingly, the major problem in modeling the contact heat transfer model is how to consider the surface roughness on surface of particle.  For the contact heat transfer between particles, the thermal contact resistance model was applied and the thermal resistance was modeled by placing a small solid block between the two contacting spheres in the simulation. In this research study, the applicability of this model was then examined by comparing with the experiments.                －9－発 表 論 文 ： 投稿論文題目  1. Examination of Various Estimation Equations for Drag Force by Using Immersed Boundary Method Kenya KUWAGI, Yu SHIMOYAMA, Azri BIN ALIAS, Hiroyuki HIRANO and Toshihiro TAKAMI  Journal of Chemical Engineering of Japan, 45(1-3), 107-113, 2012-03  2. An Attempt of Immersed Boundary Method to Calculate Lift Force and Viscous Torque of a Particle Azri BIN ALIAS, Kenya KUWAGI, Yu SHIMOYAMA, Hiroyuki HIRANO and Toshihiro TAKAMI INFORMATION- An International Interdisciplinary Journal (Accepted)    国際学会参加・発表  1. Numerical Simulation of Heat and Flow around Two Contacting Particles Kuwagi, K., Bin Alias, A., Bin Mokhtar, M.A. and Takami, T. The 7th JSME-KSME Thermal and Fluids Engineering Conference (2008), E223, p.136  2. Effect of surface roughness on heat and flow around two contacting particles using numerical simulation Azri bin Alias, Kenya Kuwagi, M. Arif bin Mokhtar and Toshihiro Takami  22nd International Symposium on Chemical Engineering (2009) OE-10  4. Numerical Experiment on the Effect of Surface Roughness for Heat and Flow Around Two Contacting Particles Bin Alias A., Kuwagi K., Bin Mokhtar M. A., Takami T. and Horio M. Fluidization XIII (2010), pp. 591 – 598  5. Modelling of Thermal Contact Resistance Model for Two Contacting Particles Bin Alias A., Bin Mokhtar, M. A., Kuwagi, K., Hirano H. and Takami, T. The 21th International Symposium on Transport Phenomena, ISTP-21, (2010), Paper No. 219  6. Comparison of Fluidization Simulations Using Immersed Boundary Method and Discrete Element Method Kuwagi K., Bin Mokhtar M. A., Shimoyama Y., Bin Alias A., and Takami T. The 2nd Asian Conference on Innovative Energy & Environmental Chemical Engineering －10－(ASCON-IEECE), (2010), pp. 57-62  7. Numerical Study of Drag Foce Acting on Dense Particles with Immersed Boundary (IB) Method Kuwagi K., Shimoyama Y., Shima T., Bin Mokhtar M. A., Bin Alias A., and Hirano H. The 2nd Asian Conference on Innovative Energy & Environmental Chemical Engineering (ASCON-IEECE), (2010), pp. 47-52  8.  Study on Effects of Geldart’s Powder Classification on Lateral Force Using IB Method Bin Alias A., Shimoyama Y., Kuwagi K., Hirano H., and Takami T. The 23rd International Symposium on Transport Phenomena, ISTP-23, (2012), Paper No. 190  9.  Study on Relationship between Fluidization Characteristics and Lateral Force Acting on Two Contacting Particles Azri Bin Alias, Kenya Kuwagi, Hiroyuki Hirano, Toshihiro Takami and Jonathan Seville Fluidization XIV (2013),   国内学会参加・発表  2008 年      第 27 回混相流学会年会講演会       接触二粒子周りおよび内部の熱と流れの数値シミュレーション    Heat and Flow Simulation in and around Two Contacting Particles KUWAGI Kenya, Bin ALIAS Azri, Bin MOKHTAR Muhammad Arif, TAKAMI Toshihiro 2011 年      第 30 回混相流学会年会講演会    シミュレーションと実験による流動層内の流れの可視化          Visualizations of flow in a fluidized bed by simulation and experiment                 Azri bin Alias, Kenya Kuwagi, Yu Shimoyama, Toshihiro Takami, Hiroyuki Hirano  2012 年   第 18 回流動化・粒子プロセッシングシンポジウム         接触二粒子に働く横方向力と粉体流動特性の関係に関する検討               Study on Effects of Geldart’s Powder Classification on Lateral Force Using IB Method                 Azri bin Alias, Kenya Kuwagi, Hiroyuki Hirano, Toshihiro Takami,   －11－－12－

Evaluation of Various Estimation Equations for Particle-Fluid Interaction Forces and Modeling of Heat Transfer between Particles for DEM Simulation

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Evaluation of Various Estimation Equations for Particle-Fluid Interaction Forces and Modeling of Heat Transfer between Particles for DEM Simulation

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