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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental evaluation of pressure drop in round tubes provided with physically separated, multiple, short-length twisted tapes
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Experimental evaluation of pressure drop in round tubes provided with physically separated, multiple, short-length twisted tapes

机译：配有物理分离的多条短长度扭曲带的圆管中压降的实验评估

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摘要

Isothermal pressure drop tests were performed on horizontal round tubes each containing identical, physically separated, equally spaced, short-length twisted tapes (TTs). The tests investigated the dependence of the Darcy friction factor, f, on the empty tube Reynolds number Re, TT twist ratio y, and TT spacing s. The variation of f across TTs belonging to the same test section was also examined. Ranges of the experimental variables examined were: 10,000 ≤ Re≤ 90,000, 1.5 ≤ y≤6, and s=30, 40 and 50. The number of 360° revolutions was held constant for all the tapes and equal to 1.5. Tap water at room temperature and nearly atmospheric pressure was used as the working fluid. A correlation for the Darcy friction factor, in the form f=f (Re, y, s), was developed from the collected experimental data, with excellent accuracy.
机译：在水平圆管上进行等温压降测试，每个圆管包含相同的，物理上分开的，等距的短长度扭曲带（TT）。测试研究了达西摩擦系数f对空管雷诺数Re，TT扭曲比y和TT间距s的依赖性。还检查了属于同一测试部分的各个TT之间的f的变化。检查的实验变量范围为：10,000≤Re≤90,000、1.5≤y≤6，并且s = 30、40和50。所有磁带的360°转数保持恒定，等于1.5。使用室温和接近大气压的自来水作为工作流体。根据收集的实验数据，以精确度确定了达西摩擦因数的相关关系，形式为f = f（Re，y，s）。

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