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http://dx.doi.org/10.3795/KSME-B.2002.26.6.779

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

Lee, Pil-Jong (포항산업과학연구원 열유체연구팀)
Choi, Ho (포항산업과학연구원 열유체연구팀)
Lee, Seung-Hong (부산대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.26, no.6, 2002 , pp. 779-787 More about this Journal
Abstract
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.
Keywords
Rotating Roll; Spray Jet; Heat Transfer Coefficient; Specific flow Rate; Finite Difference Method;
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