Effect of Length to Diameter Ratio on Transient Flow Characteristics

EasyChair Preprint 2664

Abstract

Hydraulic transient analysis is vital in the design of water pipeline systems for the selection of appropriate pipe materials and pressure classes as it leads to large fluctuations in pressure, known as water hammer. The different parameters that influence the water hammer characteristics are closure time, length of pipe, the diameter of pipe and pipe wall thickness. A clear understanding of the situations leading to water hammer is required to avoid system malfunction or breakdown. This paper numerically analyses how the length to diameter ratio of pipe affects the water hammer effect. Numerical modeling and analysis are carried out in ANSYS FLUENT solving the Navier-Stokes Equations.This study simulates the flow in mild steel pipe with varying length to diameter ratio. The study shows that as the length to diameter ratio decreases, the magnitude of water hammer pressure decreases and the pressure wave damps quickly.

Keyphrases: Computational Fluid Dynamics, Diameter ratio, Length to diameter ratio, Pressure wave damping, Transient flow, water hammer

@booklet{EasyChair:2664,
  author    = {Deepa Davis and Miji R. Cherian},
  title     = {Effect of Length to Diameter Ratio on Transient Flow Characteristics},
  howpublished = {EasyChair Preprint 2664},
  year      = {EasyChair, 2020}}