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Newsletter Nagare2025.2.27 Update
― Theme : "The Conference of Fluid Engineering Division (Part 1)" ―
- Preface
Hyun Jin PARK, Shoichi MATSUDA, Chungpyo HONG - Present to Future of Rocket Propulsion -JAXA Kakuda Space Center Initiatives-
Takeo TOMITA (JAXA) - The 21st Dream contest of the flow Moment of healing
Shoma HIJIKATA (Meisei University) - Thinking about the SDGs from another point of view
Yui YAMADA, Taichi WATANABE and Haruto KAWATA (Nihon University) - Report of The Dream of Flow Contest
Masashi KAMBE and Taro MATSUSHIMA (Kanazawa University)
Enjoy Fluid Experiments Lab.2025.2.24 Update
| Pressure, outflow velocity | Pistons and cylinders |  |
Water is drained out through a piston that utilizes a plastic cup. |
| Pressure, outflow velocity | Narrow and wide cylinders |  |
When pushing with a piston, is it better to use a thin cylinder or a thick cylinder? |
| Pressure, outflow velocity | Ejection due to the weight of the weight |  |
We allow the weight of the piston to increase the momentum of the water outflow |
| Water depth and pressure, Water height and energy |
Continuous production of bubbles |  |
We bend the flow of water coming out of the faucet with static electricity! |
| Water depth and pressure, Water height and energy |
Timer using water runoff |  |
Let the water flow out of the plastic bottle and measure the time it takes. |
| Static electricity | Static electricity bending the flow |  |
We bend the flow of water coming out of the faucet using static electricity! |
| Static electricity | Propelling water far away with static electricity |  |
We use static electricity to propel the stream jetting out from the side of the plastic bottle over a great distance! |
| Drag, water resistance, terminal velocity | Don't let COVID get the better of you 5 (submerge small particles in water) |  |
As a countermeasure against the new coronavirus, let's measure the velocity at which small objects fall by experiment. We try to submerge small particles in water. |
| Drag, aerodynamic drag | Don't let COVID get the better of you 6 (drop small objects) |  |
Drop small and large styrofoam objects and compare how fast they fall. |
| Drag, aerodynamic drag | Don't let COVID get the better of you 7 (drop small pieces of paper) |  |
We drop small pieces of paper and compare how fast they fall |
| Ventilation, separation | Don't let COVID get the better of you 1 (room with one window) |  |
Experiment with room ventilation to prevent the COVID virus. We begin with the case of a room with one window. |
| Ventilation, separation | Don't let COVID get the better of you 2 (room with two windows) |  |
Experiment with ventilation in a room with two windows. |
| Ventilation, separation | Don't let COVID get the better of you 3 (two windows on alternate sides) |  |
Experiment with ventilation in a room with two windows on alternate sides. |
| Ventilation, separation | Don't let COVID get the better of you 4 (room with four windows) |  |
Experiment with ventilation in a room with four windows. |
| Vortex | Bubbles in a vortex |  |
We create a vortex in the tank and generate air bubbles in it |
| Vortex, secondary flow | Vortex generated by a swirl at the bottom |  |
We apply a swirl near the bottom of the tank to create a vortex and observe the flow! |
| Vortex, secondary flow | Vortex generated by a swirl at the top |  |
We give it a swirl at the top of the tank to create a vortex and observe the flow! |
| Separation vortex | They don't fall where intended. |  |
If you drop a marble in the water, it will not fall where you aim. |
| Separation vortex, density, Reynolds number |
Drop on intended target 1 |  |
We sink the plastic ball in the intended area! |
Separation vortex, Reynolds number |
Drop on intended target 2 |  |
We sink a small object in the intended target area! |
| Separation vortex, viscosity, Reynolds number |
Drop on intended target 3 |  |
We thicken the water and sink the sphere in the intended area. |
| Buoyancy, Cartesian diver, Rotor blade | Rotating Cartesian diver |  |
Cartesian diver that floats and sinks while rotating |
| Buoyancy, Cartesian diver, momentum theory | Cartesian diver moving sideways |  |
Cartesian divers that move while jumping up and down |
| Buoyancy, Cartesian diver | Seahorse |  |
Seahorse shaped cartesian diver was created |
| Pressure, negative pressure | Balloon in a plastic bottle |  |
When you pull the rubber balloon, the balloon inside puffs up. |
| Buoyancy, Cartesian diver, negative pressure | Cartesian diver that float when force is applied |  |
When a balloon attached to the mouth of the jug is pulled, the cartesian divers inside rise to the surface. |
| Buoyancy, Cartesian diver, negative pressure | Garden Eel 2 |  |
When a balloon attached to the mouth of the jug is pulled, a spotted garden eel comes out of the hole. |
| Pressure, negative pressure | Fountain in a Bottle |  |
Pulling a balloon attached to the mouth of the jug creates a fountain in the bottle. |
The hot topic on study, technological development and R&D in fluids engineering fields2024.9.5 Update
| Performance prediction model of contra-rotating axial flow pump with separate rotational speed of front and rear rotors and its application for energy saving operation De ZHANG（Torishima Pump Mfg. Co., Ltd.）， |
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| Mechanism of aerodynamic force generation concerning train vibration in tunnel (LES of large-scale flow structure around simplified train model) Koji NAKADE（Railway Technical Research Institute）， Yutaka SAKUMA（Railway Technical Research Institute, currently Tokushima Bunri University）， Takeo KAJISHIMA（Osaka University, currently Shikoku Polytechnic College） |
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Let's explore lab! (Introduction of laboratories)2022.10.17 Update
The New Carbon-neutral Fuel Engineering Laboratory! （Yamaguchi University）
Ryoya Shiraishi, Associate professor Carbon-neutral Fuel Engineering Laboratory, |
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