管内单相流体沿程摩阻系数分析

以莫迪图线和鲁克－怀特方程为基准，从众多关系中筛选出单相流体的圆管内各流动区沿程摩阻系数的一整套计算公式以及各区域之间的区分界限。按单相流体沿程摩阻系数λ与雷诺数Ｒｅ、相对粗糙度ε的关系分为五种流型区域：层流区、层流与紊流之间的过渡区、紊流光滑区、紊流混合摩擦区和紊流粗糙区。除小范围的层流与紊流之间的过渡区流动较复杂，目前尚无充分认识外，其它四个区都有建议公式。

Analysis on frictional resistance coefficient of single-phase fluid inside pipeline

Based on Moody chart and Look-White equation, sieves a complete package of calculating formulae about frictional resistance coefficient of single-phase fluid along each flowing region inside circular pipe from a number of relational expression and distinguishing limit between each region. According to single-phase fluid's frictional resistance coefficient and Reynolds number Re,the relationship of relative roughness is divided into five flow pattern regions: laminar region, transition region between laminar flow and turbulent flow, turbulent flow smoothing region, turbulent flow mixing frictional region and turbulent flow roughness region. The other regions exist recommended equations except the transition region between laminar flow and turbulent flow which has not been fully recognized at present due to a small range and complicated flow.