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首页> 外文期刊>International Journal of Heat and Mass Transfer >Single-phase heat transfer, friction, and fouling characteristics of three-dimensional cone roughness in tube flow
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Single-phase heat transfer, friction, and fouling characteristics of three-dimensional cone roughness in tube flow

机译：管流中三维锥面粗糙度的单相传热，摩擦和结垢特性

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摘要

This paper reports heat transfer and friction characteristics of three tubes having a conical, three-dimensional roughness on the inner tube surface with water flow in the tube. The TC3 truncated cone tube has twice the cone area density as TC2 and provides a Nusselt number 3.74 times that of a plain tube. The h-value is 36% higher than TC2, but it has it has nearly 60% higher pressure drop. The three-dimensional roughness offers potential for considerably higher heat transfer enhancement (e.g., 50% higher) than is given by helical ridged tubes, such as the Turbo-B type. The two truncated cone tubes provide 14-20% higher h-value than the commercial Wolverine Turbo BIII tube. Further, they have both have approximately 5% higher efficiency index than Turbo BUI. Accelerated particular fouling data are also provided for 3-D tube TC3, and for helical-ribbed tubes. The results show that although the 3-D tube provided the highest heat transfer coefficient, relative to a plain tube (h/h_p), it also had the highest asymptotic fouling resistance, relative to a plain tube (R_f~*/R_p~*). Significant long-term fouling would not be expected in applications using relatively clean water.
机译：本文介绍了三个内表面呈圆锥形，三维粗糙度的管的传热和摩擦特性，其中水在管中流动。 TC3截头圆锥管的圆锥面密度是TC2的两倍，提供的努塞尔数是普通管的3.74倍。 h值比TC2高36％，但它的压降高出近60％。三维粗糙度提供了比诸如Turbo-B类型的螺旋脊管所赋予的显着更高的传热增强（例如，高50％）的潜力。与商用Wolverine Turbo BIII管相比，两个截锥形管的h值高14-20％。此外，它们的效率指数都比Turbo BUI高约5％。还为3-D管TC3和螺旋肋管提供了加速的特殊结垢数据。结果表明，尽管3-D管相对于普通管（h / h_p）提供了最高的传热系数，但相对于普通管（R_f〜* / R_p〜* ）。在使用相对清洁的水的应用中，预计不会造成长期的严重污垢。

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