대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제26권6호
  • /
  • Pages.779-787
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  • 2002
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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회전 실린더의 스프레이 분사 냉각에 관한 열전달 연구

Cooling Heat Transfer from a Rotating Roll by Impinging Water Spray Jets

  • 이필종 (포항산업과학연구원 열유체연구팀) ;
  • 최호 (포항산업과학연구원 열유체연구팀) ;
  • 이승홍 (부산대학교 기계공학부)
  • 발행 : 2002.06.01
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초록

The cooling heat transfer by impinging water spray jets on a rotating roll with a relatively large diameter has been investigated under various experimental conditions with 3 different sizes of flat type nozzle. The local heat transfer coefficients were calculated by finite difference method using measured surface temperatures of the circular cylinder as boundary conditions. Results show that a peak value of the heat transfer coefficient is located at the center of sprayed area and there may be a secondary peak at the downstream. The average heat transfer coefficients on the sprayed area were found to be 10 to 22 ㎾/$m^2$$^{\circ}C$, and were not related to spraying pressure, but approximately linearly to flow rate of sprayed water. Also it is found that increasing the distance from roll to nozzle could improve the cooling efficiency by increasing the sprayed area.

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참고문헌

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