Fluids Engineering

Department of Mechanical Engineering
Faculty of Science and Technology

SOPHIA University

7-1, KIOICHO, CHIYODA-KU, TOKYO, JAPAN

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Research Topics

1 Study on a constant pressure system
 The drive system fed by a constant pressure net is an energy saving new drive technology.   Applications of this technology to linear movement and to hybrid vehicle drive are examined by numerical simulations and experiments.

2 Study on waterhydraulic servo system
 Recently, the demand on using pure tap water as a pressure medium in hydraulic applications has increased due to its availability, low cost, high safety levels against pollution and fire hazard. This study deals with the position control of a water hydraulic cylinder and the phenomena that are accompanied with it.

3 Flow analysis in pneumatic valve
 The flow in pneumatic valve is numerically solved, taking into account the effects of both viscosity and compressibility. Experiments are conducted, and the results are compared with numerical ones.

4 Flow characteristics of high intelligent fluids

 Microscopic behavior of ER (Electro-rheological) fluids is visualized using a high speed video camera and CCD camera, with a microscope viewing system, under the application of electric fields. The effect of electrical change and flow rate on the pressure drop is explained from the results of the flow visualization. A liquid crystal is used as one of the ER fluids.

5 Flow analysis in a hydraulic control valves and a pump
 Flow analysis in a hydraulic control valve and a pump is conducted theoretically and experimentally. Three-dimensional flow in a ball valve for divergent flow is analyzed numerically using the vortex method when a ball is oscillating with cavitation.

6 Flow-induced vibration
 In order to reduce noise, flow near the reed valve in a reciprocating compressor for an automotive air-conditioning is investigated using experimental and numerical flow visualization. The reed valve is improved to prevent the vibration of the valve. Fluid properties are obtained from the visualized results using PIV (Particle-Image Velocimetry) .

7 Flow visualization around a bluff body and in a tornado with particles
 The flow simulation around a bluff body is conducted using the vortex method in order to obtain the streamlines, the critical Reynolds number, the lift force and the drag force. The mechanism of the tornado is also visualized experimentally and theoretically.