Shuji Matsusaka

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Verified

Shuji verified their affiliation via an institutional email.

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• PhD
• Professor Emeritus at Kyoto University

Railway vehicles may experience wheel slip/slide while braking in rainy or snowy conditions. Compressed air and ceramic particles are used and directed toward the wheel-rail contact area to improve wheel adhesion. In this study, bench tests were conducted to determine the effectiveness of continuous and intermittent jetting of ceramic particles. An...

This review article evaluates the powder flowability of nine different samples, focusing on differences in particle diameter distribution. Because the proportion of fine particles that can reduce flowability varies depending on the sample preparation conditions, the use of the median diameter as the representative value for each sample is inappropr...

In past decades, the electrostatics of granules and granular flows has obtained more and more attention due to many industrial problems and the associated development of new technologies. Granule-wall collision causes electrification, where charge transfer can be characterized by work function, electron transfer, ion transfer, and material transfer...

Wheel sliding, which may occur during rainy weather, is a severe problem faced by railways. The re-adhesion control method is an effective countermeasure; however, it cannot entirely prevent wheel sliding. Therefore, an increasing number of rail vehicles are equipped with a device that jets a small amount of ceramic particles toward the contact are...

A continuous particle mixing system using electrostatic forces and vibrations was developed. The system consists of two symmetrically arranged devices. The same or different types of charged particles were continuously fed from each device in a dispersed state and mixed instantaneously in the space between devices. When charged particles with oppos...

The interaction between particles and inclined substrates in a centrifuge was investigated theoretically and experimentally. First, the balance of the force acting on a particle adhering to the substrate, with an inclination angle from 0 to 90° to the horizontal, was formulated separately in the normal and tangential directions. The adhesion force...

Two types of high-performance shear test methods were employed to analyze the mechanical properties of powders. Both tests accurately measured the normal and shear stresses acting on the shear plane. Alumina powders with mass median diameters of 0.67, 4.0, 9.9, and 49 µm were used as samples. The effects of repeated shearing on the void fraction, s...

Electrostatic forces can be used to control the motion of charged particles. In this article, particle charging and motion in an electric field under ultraviolet (UV) irradiation were investigated. When the particle layers deposited on an insulating substrate were irradiated with UV light in a downward electric field, photoelectrons were emitted, a...

A centrifugal method was used to analyze and evaluate particle–surface interactions. Particles with count median diameters of 9.7, 14.5, and 32.8 μm were removed from horizontally and vertically mounted metal substrates. A point-mass model is conventionally used to analyze the forces exerted on particles during centrifugation. Conversely, in this s...

Particle charging is a typical underlying phenomenon in powder-handling processes. Charged particles rapidly deposit and accumulate on the surface, resulting in a loss of operability and productivity. The particles can be effectively removed from the surfaces using external electric fields because the electrostatic forces allow the particles to mov...

The charging and levitation of particles using UV irradiation in an upward electric field were investigated. Glass beads with a mass median diameter of 61 m were used for the experiments. The particle layers formed on a glass plate were irradiated by UV light with wavelengths ranging from 240 to 400 nm. The particles in the top layer were positivel...

Electrostatic forces cause spontaneous movement of charged particles; subsequently, electrostatic technology is attracting attention because of its application in powder handling processes, such as separation, classification, dispersion, and collection. Dielectric and conductive particles are charged by induction in a strong electric field and move...

When manufacturing pharmaceutical tablets by direct compression, the relationship between powder flowability and packing fraction must be evaluated to ensure that an appropriate excipient is selected. In this study, three types of microcrystalline cellulose with different particle sizes and shapes were evaluated by using the vibration shear tube me...

This research study focuses on wall fouling and electrostatic charging in gas–solid fluidized beds. Experiments were conducted with glass bead particles with different mass median diameters in an acrylic column at different humidity levels. The coverage ratio of particles on a wall was measured with two different methods. To obtain the local covera...

Nanoparticles have advantageous small-size and surface effects that impart them with unique mechanical properties. To evaluate these properties, a constant-volume shear tester that can precisely measure stresses on the shear plane was used. Six samples, namely, hydrophilic and hydrophobic silica, alumina, and titania nanoparticles, were prepared fo...

When a container filled with granular material is shaken, the solid content is fluidized due to the loss of force balance acting on each solid. This vibration-induced fluidization technique is useful for creating ordered mixtures as well as preventing particles from clogging. In addition, improving powder flowability enables new applications such a...

Atmospheric pressure plasma jets (APPJs) have more advantages regarding flexibility of operation than low pressure plasmas. Because the ions and/or electrons in the APPJ can be arbitrarily extracted to a gas-phase space by changing the DC bias voltage and efficiently deposited onto particle surfaces in an external electric field, this operating tec...

The flowability of powders used in tableting significantly affects tablet weight and content uniformity of active pharmaceutical ingredients. Use of granulated materials instead of powdered materials can improve flowability. In this study, the effect of particle size distribution on flowability of granulated lactose was quantitatively analyzed. Thr...

The electrification, agglomeration, and levitation of particles in a strong electric field were analyzed experimentally and theoretically. Particle layers of glass, alumina, and ferrite were formed on a plate electrode and an external voltage was applied. Microscopic observations of the agglomerates levitated from the particle layers revealed that...

The mechanism of disintegration of agglomerates in a non-uniform electric field was studied experimentally and numerically. An external electric field was formed between an upper electrode made of wire mesh and a lower electrode comprising a metal plate. The dielectric particle layers on the lower electrode were charged by induction, and straight-c...

This is an article translated from the original version published in the Journal of the Society of Powder Technology, Japan. A new method for evaluating powder flowability is developed using a constant-volume shear tester; this tester measures the upper and lower normal stresses and the shear stress acting on a powder bed. A single shear test provi...

Electrification and levitation of particles in a continuous particle feed and dispersion system have been studied both theoretically and experimentally. This system consisted of a vibrator and inclined parallel electrodes. A mesh and a vibrating plate were used for the upper and lower electrodes, respectively. A dc voltage was applied to one of the...

This study demonstrates a new constant-volume shear test configuration to analyze the stresses in powder beds and evaluate powder flowability. A novel cylindrical shear cell geometry and load cell arrangement allowed precise measurement of the normal stress acting on the shear planes of the powder beds. The stress transmission ratio between the top...

The control of powder flowability with fine particles is important for tablets prepared by direct compaction. In the present study, the addition ratio of two types of fine particles of silicic acid compounds that can be used as glidants was examined to improve powder flowability. The powder sample, lactose, with a count median diameter (DP50) of 10...

Applying an external electric field enables electrostatically charged particles to move without any external mechanical forces. As a result, electrostatic-based techniques have attracted considerable attention in the field of particle handling. In this experiment, a plate electrode and a mesh electrode were used for lower and upper electrodes, resp...

In this study, vibration-induced convection was studied experimentally using a fine powder with a mass median particle diameter of 8 μm. A cylindrical rod arranged vertically in a powder container was vibrated horizontally with simple harmonic motion at a frequency of 300 Hz using a piezoelectric vibrator. For a vibration amplitude of 10 μm, partic...

The effect of surface modification on powder flowability was experimentally investigated in the present study. The powder sample was granulated lactose with 147 ‍μm mass median diameter, which is used as an excipient for direct compression. The surface of the granulated lactose was modified by mechanical dry coating with silicon compound glidants,...

A new method for evaluating powder flowability is developed using a constant volume shear tester; this tester measures the upper and lower normal stresses and the shear stress acting on a powder bed. A single shear test provides a series of characteristics, such as powder yield locus (PYL), consolidation yield locus (CYL), critical state line (CSL)...

Experiments were carried out on the electric charging of particles continuously fed on a dielectric plate using charges generated by an atmospheric pressure plasma jet. The jet was generated by supplying 1 SLM (standard liter per minute) of helium gas and by applying AC voltage (6 kHz, 5 kV) and DC bias voltage (range: −5 to +5 kV). By varying the...

Experiments were carried out on the electric charging of particles in a powder bed with positive ions and/or electrons, which were generated by an atmospheric pressure plasma jet. Here, the effective electric charging area was set to be approximately 0.01 m² by supplying 1 SLM (standard liter per minute) of helium gas. The upper layer particles of...

The electrostatics of charged particles are utilized for various applications. This paper presents an analysis of the electric field and electrostatic adhesive force on a charged dielectric particle lying on a conducting plane under an externally applied electric field. The purpose of the analysis is to quantitatively investigate the force variatio...

A method for controlling electrostatic charge on particles with positive ions and/or electrons generated by an atmospheric pressure plasma jet was studied experimentally. The atmospheric pressure plasma jet was generated by applying AC voltage and DC bias voltage to a cylindrical electrode in a quartz glass tube with helium gas flow. By changing th...

The saltation of fine particles on an obliquely oscillating plate was simulated using a mass-point model that considered the gravity, fluid resistance, restitution, and friction. To examine the effects of the restitution and fluid resistance on the horizontal transport velocity, the two-dimensional movements of three particles with different coeffi...

The vibrating conveyor is a machine with an obliquely oscillating trough that induces the saltation of particles. It is widely used for the transport of solid materials in industry. However, basic studies on the adhesive forces and fluid resistance that act on the particles have been neglected, and there have been few reports detailing the vibrator...

The collision of particles having diameter ranging from 20 to 300 μm in a gas with a wall was studied both experimentally and theoretically. The effect of the particle diameter on the incident and rebound velocities was quantitatively examined by using images captured by a high-speed microscope camera. The incident velocities calculated using a mod...

Particle deposition and resuspension during turbulent flow were investigated using a rectangular channel with glass side walls. Micrometer-sized alumina particles were used in the experiments. Particle behavior in the rectangular channel was observed through a high-speed microscope camera with a resolution of 0.3 μm and a speed of 87,600 fps, and p...

Particle detachment from an obliquely oscillating plate was studied experimentally and theoretically. The plate was placed in a horizontal position, and vibrations were applied in the horizontal and vertical directions by piezoelectric vibrators. The frequency of vibration was constant at 280 Hz. The amplitude of vibration increased with time and a...

In this study, we propose a new method to effectively characterize particle tribocharging caused by repeated contact with a wall in an external electric field. We perform experiments using a two-stage system consisting of two inclined vibrating plates and electrodes. The mass flow rate and charge of particles were controlled at the first vibrating...

An improved airflow method to measure the distribution of adhesive strength between charged particles and a metal substrate in an external electric field is presented. In this study, toner particles were negatively charged with a corona charger and deposited on the substrate. The substrate with the particles on the surface was mounted in a rectangu...

Particle saltation on an obliquely oscillating plate is simulated using a mass-point model that considers gravity, fluid resistance, restitution, and friction. The calculated results are in good agreement with results obtained experimentally for particles with different diameters and restitutions. A large particle with high restitution bounces forw...

This paper presents a microscopic analysis of the saltation of particles on an obliquely oscillating plate driven by sine waves with an amplitude on the order of tens of micrometers and a frequency on the order of hundreds of hertz. To examine the effect of the diameter of a particle on its motion, the trajectories and velocities of different-sized...

Powder flowability of microcrystalline cellulose particles having different particle shapes, whose aspect ratios ranged from 1.8 to 6.4, was measured using the vibration shear tube method. Particles lubricated with magnesium stearate were also investigated in order to evaluate the effect of surface modification on powder flowability. Particles were...

A new method for characterizing particles triboelectrically charged through repeated contact with a wall has been studied both theoretically and experimentally. A two-stage system consisting of inclined vibrating plates with electrodes was used in this experiment. The first stage possessed functions to control the initial charge and flow rate of th...

A device for evaluating particle-wall contact charging has been developed. The device consists of a circular metal plate placed horizontally on the top of a stand and vibrators that enable the plate to oscillate vertically and rotationally. Spherical particles several tens of micrometers in diameter were sparsely distributed on the plate and their...

The dynamic behavior of a bubbling fluidized bed that requires only vibration and not the use of an external air supply system as a driving source was analyzed in detail. Alumina particles of 8 µm in diameter were placed into a cylindrical glass tube with a bottom plate, and a small horizontal vibration of 300 Hz was applied using a piezoelectric v...

The use of vibrations and an external electric field for triboelectrically charging particles has been studied both theoretically and experimentally. The condenser model was applied to formulate particle charging caused by repeated contact with a surface. In this experiment, particles were fed from the top of an inclined vibration plate. The partic...

The movement of particles in the range from 0.5 to 500 μm in mass median diameter on a two-dimensional vibrating plate is observed through a high-speed digital camera with a zoom lens. The results show that larger particles saltate higher, while smaller particles easily agglomerate and slightly saltate because of the low restitution of their loosel...

When particles are transported in pipelines, they acquire electrostatic charges as they come into contact with the pipe wall. Charged particles can cause problems such as particle agglomeration, blockage, and explosion. Understanding the particle charge can help to prevent these issues. This study investigates a technique for predicting the particl...

Rapid expansion of liquid carbon dioxide through a nozzle can result in the production of dry ice particles by the Joule Thomson effect. Dry ice jets formed by this method are employed in various industrial fields because of their advantageous properties such as lower temperature and sublimated dry ice particles. However, fundamental knowledge on t...

We demonstrate that a vibration-induced air inflow can cause vigorous bubbling in a bed of fine particles and report the mechanism by which this phenomenon occurs. When convective flow occurs in a powder bed as a result of vibrations, the upper powder layer with a high void ratio moves downward and is compressed. This process forces the air in the...

Supplementary video S1

Supplementary video S2

A novel system for characterizing particle charging as a function of the distance traveled has been designed and manufactured on the basis of the particle charging induced by repeated contacts with a wall. A vibration of several hundred hertz is applied for effective contact of the particles with the wall. In addition, an electric field is applied...

A novel micro-feeder for fine powders is developed using a vibration shear flow mechanism. This feeder consists of a cylindrical tube and a bottom, which are vibrated by piezoelectric vibrators. Particles in the tube are discharged through a narrow gap between the lower edge of the tube and the bottom surface. The frequency and maximum amplitude of...

This paper presents the detailed study of particle behavior in the vibration shear flow. Micron, submicron, and nanoparticles were discharged through a narrow gap whose walls were vibrated by two piezoelectric vibrators in a tangential direction at in-phase and anti-phase. The mass flow rates of the discharged particles were measured to evaluate th...

Background: The evaluation of lubricity or flowability of pharmaceutical powders is important for consistent production and quality control of drug products. However, there have been only a few studies on quantitative measurements of the properties of lubricated powders. Method: Magnesium stearate (MgSt) and sodium stearyl fumarate (SSF) were us...

The formation of dry ice particles in a jet flow has been studied experimentally. The particles were produced by rapid expansion of liquid carbon dioxide through a nozzle, based on the Joule–Thomson effect. Their size distribution was measured by a laser diffraction method. The experimental results showed that the primary dry ice particles ejected...

The flowability of powders with different mass median diameters ranging from micrometers to nanometers was measured using the vibration shear tube method. In the measurement system used in this study, the powder was discharged through a narrow gap between a vibrating tube edge and a flat bottom surface, where each particle could experience high she...

The characteristics of dry ice particles produced by expanding liquid carbon dioxide and its application for surface cleaning have been studied experimentally. The production of the dry ice particles was based on the Joule-Thomson effect. The ejected dry ice particles were observed using a high-speed microscope camera. Through digital image process...

In this study, we have investigated the application of dry ice blasting to remove fine particles adhering to surfaces and examined the removal process. The removal efficiency, area, and frequency have been analyzed using images captured with a high-speed microscope camera. In addition, the temperature of the dry ice jet has been measured in order t...

The formation of dry ice particles in a jet flow has been studied experimentally. The particles were produced by rapid expansion of liquid carbon dioxide through a nozzle, based on the Joule–Thomson effect. Their size distribution was measured by a laser diffraction method. The experimental results showed that the primary dry ice particles ejec...

When two different materials are brought into contact and separated, an electric charge is transferred from one to the other. This phenomenon is called contact electrification, contact charging, tribocharging, etc. Charged particles in powder processing cause various secondary phenomena, such as deposition, adhesion, and electrostatic discharge. On...

A new method for evaluating powder flowability, named vibration shear tube method has been developed. In this measurement system, the powder was discharged through a narrow gap between a vibrating tube edge and a flat bottom surface, where the particles experienced high shear forces to overcome the adhesion and friction forces. The vibration amplit...

A new monitoring system has been developed to observe the state of a particle-jetting device which is used to prevent wheel slip in a railway vehicle. The particle-jetting detection ability of the proposed monitoring system was examined by conducting bench tests and vehicle running tests. The result of experimental study shows that the proposed sys...

The removal of particulate contaminants adhering to a surface has been investigated using a dry ice blasting system. Monosized spherical latex particles of micron and submicron sizes were used as particulate contaminants, while the dry ice jet was produced by the thermal expansion of liquid carbon dioxide (CO2). Removal of the contaminants was obse...

To reduce the sample amount required for the measurement and evaluation of particle flowability, a simple method has been developed through experimental research. The principle of this measurement is based on the vibrating tube method. The sample particles used in the experiment were pulverized ZrO2 and granulated WO3 with different concentration o...

To develop a method for measuring the flowability of MOX (mixed oxide of uranium and plutonium) particles used in the simplified MOX pellet fabrication process, the flowability of model particles has been investigated by the vibrating tube method. As model particles, pulverized ZrO2 and granulated WO3 were used. To prepare a variety of samples, coa...

Large amount of particles are used in the industrial systems. Numerical analyses of these systems are expected to reduce designing cost. However the numerical analysis of powder is not used practically, because it requires high calculation cost which grows up with the number of particles. Besides, there are memory consumption problem which is requi...

Formation of dry ice particles and their agglomeration process have been studied experimentally. The dry ice particles were produced by expanding liquid carbon dioxide at room temperature and pressure, and then introduced into an additional tube acting as an agglomeration chamber. In the experiments, the temperatures of the jet flow and the tube wa...

Formation of dry ice particles and their agglomeration process have been studied experimentally. The dry ice particles were produced by expanding liquid carbon dioxide at room temperature and pressure, and then introduced into an additional tube acting as an agglomeration chamber. In the experiments, the temperatures of the jet flow and the tube wa...

Particles are often electrostatically charged by frictional contact during powder-handling operations. This phenomenon is called ‘triboelectric charging’ or ‘contact electrification’. The charged particles cause problems such as particle deposition and adhesion. In addition, if particles are excessively charged, an electrostatic discharge may occur...

Powder flowability is affected by many factors, such as particle diameter, shape, adhesion, and friction ; thus, it is difficult to theoretically estimate the flowability. To accurately estimate the flowability, powders should be tested. In this review, the test methods are categorized based on the mechanism of measurement, and their systems and pr...

A new wheel slide detection and control system is developed for the railway vehicles. Recently, the number of new model vehicles where the anti-lock braking system (ABS) was installed is increasing to prevent the wheel slide that causes increase in the braking distance and damage to the wheel. The ratio of the number of vehicles in which ABS is ins...

Most aerosols found naturally in the ambient environment or those dispersed from artificial devices such as dry powder inhalers, are electrically charged. It is known that a strong electrostatic charge on aerosols can result in transport behavior dramatically different from that of uncharged aerosols, even in the absence of an external electric fie...

The flowability of coarse particles has been experimentally investigated using the vibrating tube method, to evaluate the applicability of this method to MOX (mixed oxide of PuO2 and UO2) particles which are nuclear fuel used for electric power production. Five sizes of non-radioactive model particles, smaller than 850 μm, made of ZrO2 were prepare...

Matcha, powdered green tea, is difficult to handle in the factory or manufacturing facilities due to its small particle size and low density. In the present study, the powder flowability properties of various matcha samples were investigated using a dynamic powder flow tester with high detection sensitivity to facilitate machine handling during mat...

An automatic measurement system for evaluating powder flowability based on the vibrating capillary method has been studied experimentally. The vibration amplitude was controlled by a computer, and the vibration acceleration and the mass of particles discharged from the capillary were obtained by digital processing. The measurement time was 2 min an...