Chapter 4 - Vibrations Induced by Internal Fluid Flow

Abstract

Piping systems are widely utilized for conveying fluids in many industrial fields. It is therefore vital to understand the problems that arise from vibration due to internal flows in pipes. In particular, the instability problem of a flexible pipe conveying fluid is now considered a paradigm for instability mechanisms in fluid–structure interaction systems. For this reason a significant body of research on the dynamics of flexible pipes conveying fluid exists. In this chapter, the stability behavior of flexible pipes conveying fluid is presented. The first section focuses on vibration of standard straight pipes excited by high speed and oscillating or two-phase flow. For vibration of pipes excited by internal flow the research history, the modeling methods and dynamic behavior are presented. Analysis methods for pipes excited by oscillating flow as well as two-phase fluid flow are presented next. The vibration of bellows and corrugated tubes, which are widely used in industry, is another subject addressed in this chapter. The last section of the chapter introduces the dynamics of collapsible tubes, which are important in biological engineering. For all the types of vibrations discussed in the chapter, countermeasures are also suggested.