Swirling Cavity Flow of Water through a Straight Circular Pipe. III

Article信州大学工学部紀要 33: 1-7 (1972)departmental bulletin pape

Swirling. Cavity Flow of Water through a Straight Circular Pipe 2

Article信州大学工学部紀要 32: 11-22 (1972)departmental bulletin pape

Swirling Cavity Flow of water through a Straight Circular Pipe 1

Article信州大学工学部紀要 32: 1-10 (1972)departmental bulletin pape

Performance of nano-hydraulic turbine utilizing waterfalls

The aim of this investigation was to develop an environmentally friendly nano-hydraulic turbine utilizing waterfalls. A model of an impulse type hydraulic turbine constructed and tested with an indoor type waterfall to arrive at an optimum installation condition. Effects of an installation parameter, namely distance between the rotor and the waterfall on the power performance were studied. The flow field around the rotor was examined visually to clarify influences of installation conditions on the flow field. The flow visualization showed differences of flow pattern around the rotor by the change of flow rate and rotational speed of the rotor. From this study it was found that the power performances of the rotor were changed with the distance between the rotor and the waterfalls. The maximum power coefficient of this turbine is approximately 60%. Also, to respond to changes in the waterfall flow rate, we placed a flat plate on the upper side of the rotor to control the water flow direction. As a result, we found that the coefficient of this turbine is increased with the flow rate and power could be obtained even when the flow rate changed by 3.5 times if the plate was placed on the upper side of the rotor. Although the power coefficient decreased when the plate was installed, the power coefficient still is from 53 to 58%.ArticleRenewable Energy. 35(1):293-300 (2010)journal articl

An Experimental Study on Vortex Breakdown in Straight and Divergent Pipes

Article信州大学工学部紀要 36: 1-10 (1974)departmental bulletin pape

Influence of Setting Condition on Characteristics of Savonius Hydraulic Turbine with a Shield Plate

The aim of this investigation was to improve power performance of Savonius hydraulic turbine utilizing small stream for electric generation. An attempt was made to increase the power coefficient of runner by the use of flat shield plate placed upstream of the runner. The difference of the power coefficient is discussed in relation to clearance between the runner and the bottom wall and the rotation direction of the runner. The flow field around the runner was also examined visually to clarify influences of setting conditions on the power performance. From this study it was found that the power coefficient is achieved for 0.47 by only using a flat shield plate, the increase is up to 80% over the runner without the plate. Moreover, it is the proper condition that clearance ratio is 0.73 in this study.ArticleJOURNAL OF THERMAL SCIENCE. 20(3):224-228 (2011)journal articl

Performance of a non-contact handling device using swirling flow with various gap height

Vortex levitation can achieve non-contact handling by blowing air into a vortex cup through a tangential nozzle to generate a swirling flow. In this paper, we focused on the relationship between the sucking pressure and the flow dynamics when gap distance from the cup to a work piece changes. Then simultaneous measurement of a pressure and a flow field in the cup was performed. As a result, the mean pressure changes and the pressure fluctuation inside the cup enhances with increasing gap height. Especially, periodic pressure perturbation is observed with wide gap height and it synchronizes with an eccentric rotation of the swirling flow. It is also found that the rotation axis of swirling flow steadily inclines against the central axis of the cup for appropriate gap height.ArticleJOURNAL OF VISUALIZATION. 13(4):319-326 (2010)journal articl

Influence of gas flow on argon microwave plasma jet at atmospheric pressure

Many kinds of an atmospheric-pressure plasma jet have been developed and used for widespread applications such as a surface treatment and modified. This study focused on the argon atmospheric-pressure m jet generated by discharging of RF power of 2.45 GHz microwave. The plasma jet shows sensitivity to surrounding environment: pressure, temperature and gaseous species. It is therefore absolutely imperative that a nature of atmospheric-pressure plasma jet should be understood from a point of fluid dynamics. This study, therefore, focused on the interrelationship between the plasma jet and the working gas. Motion of the plasma jet and the working gas was evaluated by velocity measurement and fast photography. As a result, the unsteady sinusoidal waving motion in the radial direction of a torch was observed. Advection velocity of the plasma in just downstream region of the torch exit increases with the supplying flow rate, and the velocity ratio is in the range of 0.75-0.87.ArticleSURFACE & COATINGS TECHNOLOGY. 206(6):1449-1453 (2011)journal articl

Determination of the isoelectric point value of 3-mercaptopyruvate sulfurtransferase and its shift by treatment with oxidized glutathione.

The isoelectric point (pI) value of 3-mercaptopyruvate sulfurtransferase (MST) from human erythrocytes was determined to be 6.3 at 10 degrees C by isoelectric focusing in horizontal slab polyacrylamide gel containing 2% carrier ampholyte (pH 3-10). The value was determined by comparison with the electrofocused bands of bovine pancreatic ribonuclease A-glutathione mixed disulfides (RNase-SG), which were composed of 8 species containing 1 (RNase-SG1) through 8 (RNase-SG8) moles of glutathione per mole of ribonuclease A with different pI values ranging from 5.3 (RNase-SG8) to 8.8 (RNase-SG1). The pI value of the same enzyme in a 110,000 X g supernatant of rat liver was 5.9, which was the same as that of rat erythrocyte enzyme. Treatments of rat hemolysate with oxidized glutathione or diamide resulted in a shift of the pI of MST to a lower value, 5.7-5.5. This shift was inhibited when these treatments were performed in the presence of dithiothreitol. These results indicate that the treatment of the enzyme with oxidized glutathione results in the formation of enzyme-glutathione mixed disulfide.</p