Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Effect of the Orifice Area Ratio on the Exit Flow of a Multi-Perforated Tube

다공튜브 오리피스 면적비 변화가 출구유동에 미치는 영향

  • Lee, Sang-Kyoo (Advanced Engineering Design Team, Ssangyong Motor Co.) ;
  • Lee, Jee-Keun (Department of Mechanical System Engineering, Chonbuk National University)
  • Received : 2013.03.08
  • Published : 2013.06.10
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Abstract

A multi-perforated tube indicates the existence of multiple holes of various shapes on the surface of a long cylinder-type or rectangular tube, and a hole installed on the surface is called an orifice, as it is relatively small in size, compared with the surface area of the tube. In this study, the flow characteristics of a circular multi-perforated tube with many orifices on the surface were investigated experimentally and numerically. The volume flowrate issuing from each orifice, discharge angle, effective flow area ratio, and the flow fields around the orifices were measured and visualized, with the variation of the orifice area ratio, at the same blockage ratio. The volume flowrate distributions along the flow direction of the multi-perforated tube tends to be more uniform, as larger orifices were positioned at the inlet side of the multi-perforated tube, compared with no orifice area change along the flow direction.

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