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NUMERICAL STUDY ON COMBINED HEAT TRANSFER IN NIR HEATING CHAMBER  

Choi, H.K. (국립창원대학교 기계설계공학과)
Yoo, G.J. (국립창원대학교 기계설계공학과)
Kim, I.H. ((주)신택)
Publication Information
Journal of computational fluids engineering / v.12, no.4, 2007 , pp. 7-13 More about this Journal
Abstract
Numerical analysis is carried out for combined heat transfer in an indirected NIR(Near Infrared Ray) heating chamber. Reynolds number and shapes of absorbed cylinder are known as important parameters on the combined heat transfer effects. Reynolds number based on the outer diameter of the cylinder is varied from $10^3$ to $3{\times}10^5$. Four difference heat transfer regimes are observed: forced convection and radiative heat transfer on the outer surface of the cylinder, pure conduction in the cylinder body, pure natural convection and radiation between lamp surface and inner surface of the cylinder, and radiation from the lamp. Flow and temperature characteristics are presented with iso-contour lines for the absorbed circular and elliptic cylinders to compare their differences. The convective and radiative heat transfer fluxes are also compared with different Reynolds numbers. As usual, Reynolds number is an important factor to estimate increasing convective heat transfer as it increases. The shape of absorbed cylinder results overall heat transfer rates remain unchanged.
Keywords
Combined Heat Transfer; Reynolds Number; Convective Heat Flux; Radiative Heat Flux; NIR Heating Chamber;
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