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RISS 인기검색어
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- 저자 : 오원균(W.K.Oh) (검색결과 2 건)
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[論文] 水平平板에 附着된 핀配列에서의 自然對流 熱傳達에 관한 實驗的 硏究
오원균(W.K.Oh),조진호(J.H.Cho),김선정(S.J.Kim),권순석(S.S.Kwon) 한국자동차공학회 1988 오토저널 Vol.10 No.1
A study has been conducted experimentally on the natural convection heat transfer characteristics of fin arrays on a horizontal flat plate in air. The effects of fin heights and Rayleigh numbers are mainly investigated.<br/> The experimental results are as follows;<br/> 1. The mean fin and mean total Nusselt numbers increase as dimensionless fin heights increase at 0.67≤H/S≤1.67. The mean plate Nusselt numbers increase in case of upward facing fins, but they decrease in case of downward facing fins. <br/> 2. The mean Nusselt numbers increase as Rayleigh numbers increase. 3. The mean fin surface Nusselt numbers has its maximum outside surface (Y₁) where there is no interference from each other fin.<br/> 4. The mean total Nusselt numbers in case of upward facing fins increase by 47% and 26%, respectively at H/S = 0.67 and 1.67 than those in case of downward facing fins for Ra_s = 6.50 X 10³.<br/>
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[論文] 열평형적분법에 의한 3차원 열전달 문제의 해석
오원균(W. K. Oh),조종철(J. C. Jo),조진호(J. H. Cho) 한국자동차공학회 1989 오토저널 Vol.11 No.6
Heat transfer in a three-dimensional straight fin of constant cross-sectional area and perimeter with unequal top, bottom, left, right and tip surface convection coefficients is analyzed by applying the heat balance integral method, and three-dimensional approximate analytical solutions of the temperature distributions within the fin and the total heat flowrates through the fin, which are expressed in the same forms as the one-dimensional approximations except for the differences in definitions and numbers of system parameters introduced in the solutions, are yielded easily.<br/> Thus the numerical evaluation of the approximate solutions by the heat balance integral method are much less laborious than the exact solutions in the forms of multiple infinite series.<br/> As a result of justifying the applicability of the approximate solutions by a comparison with the total heat flowrates through the fin evaluated from the exact solution, the approximate solution is much more accurate than the one-dimensional approXimation in most cases, and enables to take account of the three-dimensional effects.
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