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首页> 美国政府科技报告 >Experimental Heat Transfer Coefficients for the Cooling of Oil in Horizontal Internal Forced Convective Transitional Flow
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Experimental Heat Transfer Coefficients for the Cooling of Oil in Horizontal Internal Forced Convective Transitional Flow

机译：水平内强迫对流过渡流中冷却油的实验传热系数

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The heat transfer coefficients for the cooling of a Newtonian oil were determined for the ranges 550 less than Re less than 2800 and 132 less than Pr less than 642. The Reynolds number alone proved to be an insufficient criterion for the division of transfer regimes, in line with the view of Eckert. In each of three of the transfer regimes recognized heat transfer was correlated by a Hausen-type equation. The values found for A and B were 0,0184 and 213,9 for the mixed turbulent regime, 0,0277 and 272,5 for the upper transitional regime, 0,0176 and 106,1 for the middle transitional regime. In all these regimes the Stanton number increases with Reynolds number, while in true turbulent or laminar flow it decreases. In the lower transitional regime, characterized by low wall Reynolds numbers, the Stanton number fluctuated with Reynolds number and no good correlation was found.

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