Researcher Database

（Last updated : 2025-05-03 17:05:20）　

YOSHIOKA Shuya

Department / Course College of Science and Engineering Department of Mechanical Engineering

Title / Position Associate Professor

Other Affiliations
1.	Graduate School of Science and Engineering
2.	Research Organization of Open Innovation & Collaboration Research Center for Sustainability Science
3.	Research Organization of Science and Technology Ecological Technology & Management Research Center for the Energy and Environment Field
4.	Research Organization of Science and Technology Research Center of Advanced Materials
5.	Research Organization of Science and Technology Research Center for Lake BIWA & Environmental innovation

Academic background
1.	2002/03 Degree Acquisition	│ Keio University Ph.D. (Engineering)
2.	～1993/03	Department of Mechanical Engineering │ Department of Mechanical Engineering, Faculty of Science and Technology │ Keio University │ Graduated
3.	～2002/03	Doctoral Program (2nd Semester) │ Mechanical Engineering Major │ Department of Mechanical Engineering, Graduate School of Science and Technology │ Keio University │ Completed

Business career
1.	2002/04 ～ 2004/03	│ │ （スウェーデン王立工科大学）

Research activities
1.		The Japan Society of Mechanical Engineers
2.		The Japan Society for Aeronautical and Space Sciences

Subject of research
1.	Application of diamond coated surface to levitation technology
2.	Control of unsteady turbulent flow
3.	Formation of nano-micro scale bubble and its application

Research summary
(1) A microbubble generation technology and its applied research (2) An applied research on floating technology using diamond thin film surface (3) A research on an unsteady turbulent flow control technology (1) A microbubble generation technology and its applied research. ......A research on microbubble generation technology: Because the microbubble has a quite large area of the interface between a gas and a liquid, it is able to rapidly dissolve gas in the liquid. I am engaged in the research on the smaller nano millimeter scale microbubble generation technology to increase the capability. ...... A research on gas dissolution and water purification technologies: I am engaged in the research to detoxify the water consisting poisonous metals, etc. by rapidly dissolving oxygen and ozone using microbubbles. I will perform not only the purification experiments in the laboratory but the large-scale field experiments in water sources and lakes and marshes. ...... A research on an image instrumentation technology: To optically measure fluid, it is necessary to mix particles and/or droplets called tracers with the measuring objects. However, because this tracer often has a bad influence on the fluid machine of the measuring objects, the measuring objects are limited. I will eliminate this bad influence by using the microbubbles as tracers and challenge myself to expand the scope of target objects for optical measurement. (2) An applied research on floating technology using diamond thin film surface ...... A research on diamond thin film chassis for a floating transport device: The surface on which diamond thin film is deposited have a quite small coefficient of friction. It is hydrodynamically considered that the object is floating at a micro height. I apply this phenomenon to the floating technology for the next generation floating devices and develop the chassis by which the devices can stably travel. ...... A research on linear motor driving on a diamond thin film surface: Because the chassis that floats by diamond thin film floats at a micro height, it is possible to perform drive control with a linear motor and execute noncontact power feeding at high efficiency. Then, I research the intelligent platform driven by a linear motor that can freely travel on a 2-dimensional plane. (3) A research on a unsteady turbulent flow control technology ...... A research on air flow around a motorcar body and running stability: Many researches are performed to reduce air resistance of automobile. I will challenge myself to increase the running stability on high speed traveling by controlling the air flow around the motorcar body. Here, I regard the air flow around the motorcar body as a suspension that exists in the air and integrate it with the motion of the motorcar body. ...... Wall turbulence: A research on active control of separated shear turbulent flow: To reduce air resistance arising in high-speed transport devices, the shape optimization of the body is often performed. Here, I perform uniform active control from the surface of the body and research a technology to more actively reduce the air resistance, in addition. Based on this, I contribute to the realization of the eco-friendly transport devices.

Present specialized field
Environmental Technology/Environmental Material, Fluid Engineering, Aerospace Engineering (Keyword：nano-bubble, micro-bubble, gas dissolution, water purification, porous media, diamond coating, separated flow, turbulent flow control, underbody flow, image velocimetry)

Papers
1.	2024/06/25	Manipulation of Oil Droplets Containing Magnetic Particles of S/O/W Emulsion by Magnetic Field │ Journal of the Japanese Society for Experimental Mechanics │ ,pp.68-75
2.	2023/09	Improvement of Cross Section of Magatama Type VAWT Blade by Reinforcement Learning │ Journal of the Japanese Society for Experimental Mechanics │ ,pp.220-228
3.	2023/03	Manipulation of Oil Droplets in O/W Emulsion Flow in Bifurcating Channel by Electric Field │ Journal of the Japanese Society for Experimental Mechanics │ ,pp.75-81
4.	2022/06	Velocity Measurement of Moving Oil Droplets Driven by Electric Field in O/W Emulsion │ Journal of the Japanese Society for Experimental Mechanics │ ,pp.134-141
5.	2021/12	Development of Magatama Type Vertical Axis Wind Turbine Blade by Genetic Algorithm │ Journal of the Japanese Society for Experimental Mechanics │ ,pp.322-330
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Academic conference presentation
1.	2025/03/19	Oscillatory flow measurement near the wall in a bronchial model
2.	2025/03/19	Manipulation of oil droplets in O/W emulsion by electric Field
3.	2025/03/19	Manipulation of oil droplets in A/O/W emulsion by electric field
4.	2025/03/19	Manipulation of microbubbles by electric field
5.	2025/03/18	Effect of ultrasonic waves frequency and sound pressure on microbubble aggregation
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