Authors have disclosed the mechanics and correlations of the flow phenomena in two intersecting ducts with the same angles of confluent and branching flows. In this study, experiments in two intersecting ducts with different confluent and branching angles are performed to investigate the vortex formation in the intersecting ducts. Also it investigates the flow rates in the left and right ducts when changing the condition of the upper water levels. The flow pattern in the intersecting ducts is visualized by the particle tracing method using ion exchange resin. The distribution in the intersecting region is measured by the LDV method. The flow characteristics are clarified in the intersecting ducts with different confluent and branching angles. It is also disclosed that the fluid control in the intersecting ducts with the confluent angle of 60°and the branching angle of 30°is easier than those with other angles.
Topographic measurement of water surface is essential to study wave motion. In order to measure simultaniously the whole area of wave surface, the inclined grid method of moire topography discriminating between rise and fall of water surface with high sensitivity is the most suitable technique. As the results of experiments, the inclined grid method proved adequately fit for practical use with accuracy better than ±1%. The digital image processing techniques of the moiré fringes data was developed to determine the quantities of the ups and downs of water surface, then the three-dimensional color image of the contour variation was obtained by using computer graphic techniques. The topographic measurement and visualization system was applied to the wave motion in a wave generation device utilizing a resonant duct and the three-dimensional color images of its contour variation were obtained.
IC boards are widely used to operate and control the electronic components. The Semiconductor, resistor, condenser and so on are installed on the surface of bare board plates of the P.C.B.. Generated heat of those elements on the board is transferred to the air coolant flowing through the vertical parallel channel. Heat removal performance is so complicated by flow pattern of the coolant and heat generation rate of the electronic component. The heat transfer rate of the mounted board is enhanced by the tunnel effect with the gap between the vertical parallel plates as a parameter. This paper represents to determine the optimum width of the vertical channel in respect of the heat removal performance. The infrared radiometer was used to measure the isotherm pattern of the IC board through the transparent polypropylane plate. The heat transfer characteristic was measured and analyzed using the visualized isotherm pattern displayed on the CRT of the infrared radiometer.
An experimental study is conducted to visualize and analyze thermal and wear phenomena of the reciprocating friction interface under dry condition. Temperature distribution of the friction interface, which is composed of plastic plane materials, is observed by means of the infrared radiometer. Transient temperature distribution of the reciprocating interface is continuously measured and recorded. It is revealed from a series of experiments that the excess temperature zone of the both side surface is alternatively changed according to the generation of wear powder.