수평원통관에서 선회유동의 공기동 발생에 관한 실험적 연구
An Experimental Study on the Generation of Air-core with Swirl Flow in a Horizontal Circular Tube
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Abstract
An experimental investigation was performed to study on the generation of air bubble and air core with swirling flow in a horizontal cicular tube. To determine some characteristics of the flow, 2D PIV technique is employed for velocity measurement in water. The experimental rig is manufactured from an acryl tube. The test tube diameter of 80mm, and a length of 3000mm. The used algorithm is the gray leve cross-correlation method(Kimura et al. 1986). An Ar-ion laser is used and the light from the laser(500mW) passes through a probe to make two-dimensional light sheet. In order to make coded images of the tracer particles on one frame, an AOM(Acoustic-Optical Modulator) is used.The maximum axial velocities showed near the test tube wall at y/D = 0.1 and y/D = 0.9 along the test tube. The higher Reynolds number increase, the lower axial velocities are showed in the center of the test tube.The air bubbles are generated from Re = 10,000 and developed into air core from the recirculating water pump rpm equal 30Hz. The pressure and temperature are measured across the test tube at X/D=3.33.
참고문헌 (14)
- John B. Nuttall, "Axial Flow in a Vortex", 26, pp.582~583 (1953)
- Talbot L, "laminar Swirling Pipe", asme(21), pp.1 1954~7
- Binne A. M, "Experimental Measurement of Flow Swirling Water Through a Pressure Nozzle and Open Trumpet", 235a, pp.78~88 (1955)
- Robert C. Chand, "Observations of Oscillatory Motion in Certain Swirl Flows", 21 part 1, pp.111~127 (1965)
- Alfred H. Nissan, "Swirling Flow in Cylinders", 7 no. 4, pp.543~547 (1961)
- Hay, "Heat Transfer on Free Swirling Flow in a Pipe", 97, pp.411~416 (1975)
- T-H Chang, "An Experimenta Investigation of Swirl Angle in a Horizontal Round Tube by Flow Visualiztion", 27(7), pp.897 2003~886 (2003)
- Rose, "A Swirling round turbulent jet-mean flow measurements", 29, pp.615~625 (1962)
- Robert C. Chand, "Observations of Oscillatory Motion in Certain Swirl Flows", 21 part 1, pp.111~127 (1965)
- Wolf, "Measurement of the Decay of Swirl in Turbulent Flow J. of AIAA", 7, pp.971~973 (1969)
- Medwell, "A Study of Swirling Flow in a Cylindrical Tube", 4, pp.265~275 (1989)
- Chang T. H, "An Investigation of Swirling Flow in a Cylindrical Tube", 15(13), pp.1892~1899 (2001)
- Kimura I.,Takamori T, "Image Using Processing Instrumentation of Flow", 6 no. 22, pp.105~108 (1986)
- T, "A Cross correlation technique for velocity field extraction from paticulate visualization Experiments in Fluids", 10, pp.213~2231991 (1991)