Ōsaka, Japan
Ōsaka, Japan

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Yoshida Y.,Kansai Wire Netting Co. | Yoshida Y.,Doshisha University | Inoue Y.,University of Electro - Communications | Shimosaka A.,Doshisha University | And 2 more authors.
Journal of Chemical Engineering of Japan | Year: 2015

Plain Dutch weave and twilled Dutch weave meshes are superior filter media in terms of their high mechanical strength and tiny apertures. However, because they have high flow resistivity due to their complex flow paths, it is crucial to predict the pressure drop with high accuracy for a filtration process. We, therefore, investigated the effect of the aperture structure of a Dutch weave mesh on the flow resistivity. First, we proposed a calculation model for estimating the aperture size of a twilled Dutch weave mesh to thoroughly understand the aperture structure; whereas, the aperture structure of a plain Dutch weave mesh has already been clarified. Next, numerical simulations were performed using a combination of the lattice Boltzmann and immersed boundary methods. It was found that the drag force of the Dutch weave mesh increased at the inside aperture where the volume fraction increased, and in the twilled Dutch weave mesh, the drag force at the center also varied with the local torsion of the low path. Based on these findings, we derived an equation for estimating the pressure drop across the Dutch weave mesh, and experimentally verified its validity. This enables a rational and highly accurate prediction of the pressure drop. © 2015 The Society of Chemical Engineers, Japan.


Yoshida Y.,Kansai Wire Netting Co | Yoshida Y.,Doshisha University | Inoue Y.,University of Electro - Communications | Shimosaka A.,Doshisha University | And 2 more authors.
Journal of Chemical Engineering of Japan | Year: 2015

The accurate estimation of the pressure drop across a metal woven mesh is crucial for a filtration process. We therefore investigated the effect of the geometrical characteristics, namely, the weave type (plain weave and twilled weave), wire diameter, and number of meshes (number of wires per inch), on the flow resistivity. This was done by hybrid simulation using a combination of the lattice Boltzmann and immersed boundary methods (IB-LBM). It was found that, for a given aperture size of the woven mesh, the volume fraction increased with increasing wire diameter, with a consequent increase in the drag force. The volume fraction of the twilled weave mesh was bimodally distributed in the thickness direction, with the drag force at the second peak of the distribution lower than that at the first peak owing to the resistive loss at the first peak. This tendency became more pronounced with increasing Reynolds number. Based on these findings, we derived an equation for estimating the pressure drop, wherein the drag coefficient is expressed as a function of the volume fraction and Reynolds number. Based on the proposed equation, the relationship among the drag coefficient, volume fraction, and Reynolds number calculated from the experimentally determined pressure drop across the woven mesh was plotted as a single curve for each weave type. This enabled rational and highly accurate prediction of the pressure drop across the plain weave and twilled weave meshes. © 2015 The Society of Chemical Engineers, Japan.


Yoshida Y.,Kansai Wire Netting Co. | Yoshida Y.,Doshisha University | Ishikawa S.,Kansai Wire Netting Co. | Shimosaka A.,Doshisha University | And 2 more authors.
Journal of Chemical Engineering of Japan | Year: 2013

To predict the sieving rate with high accuracy, passage probability models were proposed for undersized particles passing through (1) the vibrated particle bed, (2) the boundary between the oversized particles and the sieve surface, and (3) the sieve openings. The probability of undersized particles passing through a vibrated particle bed depends on the porosity of the bed; the probability was determined by considering the estimated porosity of the bed and the diameter of the particles constituting the bed. The sieve openings were partly covered by oversized particles, and undersized particles could reach these openings only when the gap between the oversized particles and the sieve surface (the boundary) became larger than the undersized particle diameter; the probability of undersized particles passing through the boundary was also derived. Gaudin's probability was applied to the probability of undersized particles passing through sieve openings without a boundary. The sieving rate calculated by using the proposed estimation equation based on the three probability models corresponded closely to the experimental results, and thus, the sieving rate was predicted with high accuracy. © 2013 The Society of Chemical Engineers, Japan.


Hamada K.-I.,Doshisha University | Yoshida Y.,Doshisha University | Yoshida Y.,Kansai Wire Netting Co. | Shimosaka A.,Doshisha University | And 2 more authors.
Journal of Chemical Engineering of Japan | Year: 2013

A mechanism is proposed to explain the generation of convection in vibrating powder beds based on powder mechanics. Convection induced in the vibrating powder beds was observed and the influences of the vibration amplitude and frequency on the convection were investigated experimentally. The flow behavior of the vibrating powder beds was simulated using the discrete element method (DEM) to obtain the state variables of convection, such as bulk density and velocity. A mechanical model of convection is proposed based on the microscopic observation of the flow behavior of particles and formation of convection cells in the bed by DEM simulation. Triangular and V-shaped compressed particle zones of particles were formed in alternating fashion in the vibrating powder bed, and the generation of these compressed zones repeated every two vibration cycles leads to particle convection in the bed. The number of convective rolls in the vibrating powder bed increases with an increase in the centrifugal effect. The number of isosceles-triangle-shaped compressed zones formed at the bottom of the container increased with an increase in the centrifugal effect, leading to an increase in the number of convective rolls in the vibrating powder bed. © 2013 The Society of Chemical Engineers, Japan.

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