Application of Method-of-Lines to Charging-Up Process in Pipelines with Entrapped Air

作     者：张永良 K.Vairavamoorthy 

作者机构：State Key Laboratory of Hydroscience and Hydraulic Engineering Department of Hydraulic Engineering Tsinghua University Beijing 100084China Department of Civil and Building Engineering Loughborough University Leicestershire LE11 3TUUK 

出 版 物：《Tsinghua Science and Technology》 (清华大学学报（自然科学版（英文版）)

年 卷 期：2006年第11卷第3期

页      面：324-331页

核心收录：

学科分类：080704[工学-流体机械及工程] 08[工学] 0807[工学-动力工程及工程热物理] 

基　　金：SupportedbyProgramforNewCenturyExcellentTalentsinUni-versity(No.NCET-04-0093)andtheNationalNaturalScienceFoundationofChina(No.50539070) 

主　　题：transient flow charging-up process pipelines entrapped air method of lines 

摘      要：A mathematical model is presented for the charging-up process in an air-entrapped pipeline with moving boundary conditions. A coordinate transformation technique is employed to reduce fluid motion in time-dependent domains to ones in time-independent domains. The nonlinear hyperbolic partial differential equations governing the unsteady motion of fluid combined with an equation for transient shear stress between the pipe wall and the flowing fluid are solved by the method of lines. Results show that ignoring elastic effects overestimates the maximum pressure and underestimates the maximum front velocity of filling fluid. The peak pressure of the entrapped air is sensitive to the length of the initial entrapped air pocket.