Dynamic Behaviour of Flexible Silicone Tube Subjected to Pulsatile Flow
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ORIGINAL CONTRIBUTION
Dynamic Behaviour of Flexible Silicone Tube Subjected to Pulsatile Flow R. Kamal Krishna1 • Amal G. Nath2 • S. Anoop Kumar2 • M. Unnikrishnan1 Jayaraj Kochupillai3
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Received: 18 May 2020 / Accepted: 24 August 2020 The Institution of Engineers (India) 2020
Abstract Flexible Silicone tubes possess superior qualities such as higher corrosion resistance, purity, strength, and inertness compared to other flexible tubes. Hence, these tubes own broad applicability in medical applications as well as other industrial applications. An unsteady flow through the flexible tube can induce severe internal excitation, which results in the flow-induced vibrations. Such vibrations at resonance can cause severe damage to the structure. Concerning the flexible tubes used in sophisticated medical applications, it is imperative to eliminate the structural vibrations, as far as possible. The present study examines the dynamics of the silicone tube under internal excitation due to pulsatile flow. It includes the investigation of the effect of pre-stretch and mean flow velocity on the dynamic behaviour of flexible tube by conducting parametric studies using the operational modal analysis technique. The influence of the mean flow velocity in the flexible tube is a proportional variation in the magnitude of vibration concerning fluid flow rate. An advance in prestretch causes a decrease in sagging, and the tube tends to retrieve its original circular cylindrical shape. Owing to this, when the tube is excited due to internal pulsation, the difference between the magnitude of vibration in the horizontal and vertical plane at resonance condition reduces, and the natural frequencies at different planes nearly & Jayaraj Kochupillai [email protected] 1
Advanced Dynamics and Control Lab, College of Engineering, Trivandrum, India
2
Sree Chitra Thirunal College of Engineering, Trivandrum, India
3
Mechanical Engineering Department, Government Engineering College, Barton Hill, Trivandrum, India
become equal at higher pre-stretch, where sagging is negligible. The study reveals that for flexible tubes, the tube vibration always stabilizes in an arbitrary plane under excitation due to pulsation. This investigation exhibits that impact hammer excitation is better than constrained external excitation to find the fundamental frequencies of the flexible tube conveying fluid. Keywords Pulsatile flow Excitation Flexible tube Pre-stretch Fundamental frequency Sagging Beat
Introduction Flexible fluid conveying tubes find numerous applications in the areas of gaseous, liquid as well as multi-phase fluid transfer systems. Industries and medical fields are two of the major fields of applications of flexible tubes. Silicone tube is well known for its purity and inertness, which makes it well suited for medical applications. It owns superior strength, flexibility and corrosion resistance owing to which the silicone tubes offer long life. Its ease of processability makes it a prominent name among flexible tubes. Due to th
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