巻号一覧
15 巻 (2001)
- 4 号 p. 349-
- 3 号 p. 245-
- 2 号 p. 113-
- 1 号 p. 4-
前身誌
15 巻, 1 号
選択された号の論文の7件中1～7を表示しています
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特集：混相流と数値解析・シミュレーション（１）
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片岡 勲原稿種別: 特集
専門分野: その他
2001 年 15 巻 1 号 p. 4-13
発行日: 2001年
公開日: 2003/05/30
ジャーナル フリーBasic equations and constitutive equations of gas-liquid two-phase flow were explained based on the various modeling. The local instantaneous formulation and averaged formulation of basic equations were described based on typical models such as homogeneous model, drift flux model and two-fluid model. The constitutive equations for these averaged basic equations were discussed. The modeling of turbulence in gas-liquid two-phase flow were also explained and basic equations and constitutive equations of turbulence were described.抄録全体を表示PDF形式でダウンロード (584K) -
濱荻 健司原稿種別: 特集
専門分野: その他
2001 年 15 巻 1 号 p. 14-22
発行日: 2001年
公開日: 2003/05/30
ジャーナル フリーThe methods to simulate gas-liquid two-phase flow have developed due to the progress of the computer technology and computational fluid dynamics. Then, the simulation methods lead the useful information in the industrial field and the detailed results that could not be obtained by the experimental methods. In this review, these methods are classified into the Eulerian method and the Lagrangian method. This report focuses on the interface capturing technique of each method. Detailed capturing procedure, the typical results and advantage/disadvantage of each method are disscussed.抄録全体を表示PDF形式でダウンロード (1627K) -
高田 尚樹原稿種別: 特集
専門分野: その他
2001 年 15 巻 1 号 p. 23-30
発行日: 2001年
公開日: 2003/05/30
ジャーナル フリーThis paper describes a review of the numerical simulations of multiphase fluid flow by the lattice Boltzmann method (LBM), in which a macroscopic fluid consists of mesoscopic particles repeating collisions and translations. One of the advantages is that an interface can be reproduced in a self-organizing way by repulsive interaction between particles. Two- and three-dimensional LBM simulation results are presented, spontaneous phase separation, deformation of bubble due to shear stress, and single- and two-bubble motions in a tube under gravity.抄録全体を表示PDF形式でダウンロード (1306K) -
杉山 和靖, 高木 周, 松本 洋一郎原稿種別: 特集
専門分野: その他
2001 年 15 巻 1 号 p. 31-38
発行日: 2001年
公開日: 2003/05/30
ジャーナル フリーWe survey some numerical simulation methods for dispersed flows and point out that the vorticity generation mechanism due to the horizontal gradient of the void fraction is regarded in the conventional bubbly flow simulation based on the averaged equation, while one due to the boundary condition on the bubble-liquid interface is disregarded. In order to make clear the local structure of the pseudo turbulence in the bubbly flow, the direct numerical simulation of the Multi-bubble system is carried out. The simulation based on the averaged equation is also carried out. Constitutive equations, where not only SGS stresses but also boundary conditions of the pressure and the vorticity on the interface are taken into account, are derived for the averaged equations.抄録全体を表示PDF形式でダウンロード (947K) -
丸山 茂夫原稿種別: 特集
専門分野: その他
2001 年 15 巻 1 号 p. 39-46
発行日: 2001年
公開日: 2003/05/30
ジャーナル フリーA heterogeneous nucleation of liquid droplets on a solid surface from vapor and a heterogeneous nucleation of vapor bubbles on a solid surface from liquid were simulated by the molecular dynamics method. Argon liquid or vapor was represented by Lennard-Jones molecules and a solid surface was represented by harmonic molecules with the constant temperature heat bath model using the phantom molecules outside of harmonic molecules. Nucleation of liquid droplet was realized by suddenly cooling a solid surface in contact with dense argon vapor. From the number distribution of clusters appeared on solid surface, heterogeneous nucleation rate and free energy of clusters dependent on the cluster size were measured. On the other hand, liquid argon between parallel solid surfaces was expanded in order to simulate the vapor bubble nucleation on the solid surface. With visualizations of the void patterns, molecular-level nucleation dynamics were explored for slowly and rapidly expanding systems. For both systems, the heterogeneous nucleation rate and the critical radius were not far from the prediction of the classical theory.抄録全体を表示PDF形式でダウンロード (1036K)
論文
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高橋 弘, 松井 二郎, 田村 克己原稿種別: 論文
専門分野: その他
2001 年 15 巻 1 号 p. 47-62
発行日: 2001年
公開日: 2003/05/30
ジャーナル フリーIn order to apply the vertical shield machine for the construction of the large diameter vertical shaft, a new mechanism to carry the excavated particles on the excavated surface is necessary because the direction of excavation is equal to the one of gravity. In this study, a new method to carry the excavated particles by the rotating wall-jet from the initial position to the bottom center of the vertical shaft was proposed. A small experimental apparatus was made based on the similarity law and some experiments were carried out. It was confirmed that excavated particles were carried by the rotating wall-jet, and the proposed method by using the rotating wall-jet worked well. Furthermore, it was found that the cutter spoke should have the low inclination angle and water jet should be the one in air to achieve the high discharge efficiency.抄録全体を表示PDF形式でダウンロード (1768K) -
張 蓉生, 葉山 真治, 藤川 重雄, 彭 国義原稿種別: 論文
専門分野: その他
2001 年 15 巻 1 号 p. 63-73
発行日: 2001年
公開日: 2003/05/30
ジャーナル フリーIn order to get improved bubbly water containing greater number of bubbles with smaller diameters than conventional ones, a new microbubble generation device has been developed, where a rotating porous plate is applied to the air intake unit of the device and compressed air is taken into the device through the rotating porous plate. The theoretical analysis shows that the bubble diameter detaching from the rotating porous plate decreases with the increase of the rotational speed, which results in the increase of air dissolution into working water in the mixing box. The experimental results obtained by the new device with a rotating porous plate show that the smallest mean diameter of bubbles is 11μm, the highest number density is 6.5×102/mm3 and the bubble generation rate reaches 1.5×107 number/s. It is also proved that the mean diameter is smaller and the number density is higher than those of bubbly waters generated by conventional devices, and that the bubble diameter and the number density could be effectively controlled by the rotational speed of the porous plate.抄録全体を表示PDF形式でダウンロード (1135K)
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