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化工学报  2012 

不锈钢微细圆管中去离子水流动特性

DOI: 10.3969/j.issn.0438-1157.2012.10.016, PP. 3119-3124

Keywords: 微圆管,去离子水,粗糙度,摩擦阻力系数

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Abstract:

实验研究了去离子水流过不锈钢微圆管时的阻力特性,微圆管直径为543.3、654.4、737.2μm,对应的壁面相对粗糙度分别为0.31%、0.16%、0.1%。实验中,采用长短管比较法消除实验段进、出口的局部阻力影响,通过测量得到了不同管径的压力梯度随Re的变化关系,及摩擦阻力系数f和Poiseuille数随Re的变化关系。结果表明,压力梯度随管径减小快速增加;管径较小时(d=543.3μm)壁面相对粗糙度ε=0.31%时影响管内流动,使得摩擦阻力系数及Poiseuille数增加,转捩点提前(Rec≈1500),当管径大于650μm时,较小的壁面相对粗糙度不影响管内层流流动。

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