【摘要】 全面研究了高粘性液体管道流动的热边界层减阻理论的应用。利用管道热边界层理论中关于边界层的温度分布及层流、紊流时热边界层厚度的计算表达式,推证了管壁热流量及定性温度的计算表达式,利用指数型的粘温特性方程,采用积分方法推出了管道热边界层流动中层流和紊流摩擦水头损失的计算公式,并给出了设计应用实例。计算结果表明,对于高粘液体短管输送,其流动一般均为边界层入口段,热边界层减阻的最佳范围大致是管长L≤5km,管径D≤200mm。更多还原

【Abstract】 In details, the reducing resistance theory and its application of temperature boundary layer in pipeline are studied in the paper. Based on the temperature distribution and calculation in temperature boundary layer thickness, it is deduced the calculation formula of heat flux and friction loss of head in temperature boundary layer with laminar flow and turbulent flow of pipeline. Finally, intact example of design and application is shown. The computation result is demonstrated that the flow in short distance pipeline is generally entrance segment of temperature boundary layer for high viscous liquid. The optimum range applying the temperature boundary layer reducing friction resistance is that pipeline length L≤5km, pipeline diameter D≤200mm.更多还原