What causes flow induced vibration?

What causes flow induced vibration?

Flow induced vibration is the result of turbulence in the process fluid, which occurs due to major flow discontinuities such as bends, tees, partially closed valves, and small bore connections.

How do you reduce flow induced vibration?

Mitigation of Flow-Induced Vibration

1. Reduce fluid velocity by increasing pipe size or by changing process conditions.
2. Increase system rigidity by increasing pipe wall thickness.
3. Install viscous damper, shock arrestor, snubber, etc in the piping system.
4. Reduce no turbulent sources like elbows, reducers, etc.

What causes vibration in heat exchanger?

According to the literature, the main sources of vibration in a heat exchanger are vortex shedding, acoustical resonance, tur- bulent buffeting and fluid-elastic instability.

What is lock-in Viv?

Lock-in/synchronization/wake-capture is an important phenomenon associated with vortex-induced vibrations (VIV) of bluff bodies. It is characterized by a high amplitude of structural vibrations. These vibrations can cause fatigue and may lead to catastrophic failure of structures.

What is vortex lock-in?

Lock-in range The phenomenon of lock-in happens when the vortex shedding frequency becomes close to a natural fundamental frequency of vibration of a structure. When this occurs, large and damaging vibrations can result.

What is acoustic induced vibration?

Acoustic Induced Vibration (AIV) refers to structural vibration in a piping system with vapor flow excited by intense acoustic pressure. High-frequency sound waves can excite the circumferential-mode of vibration of pipe and may result in fatigue failure at welded attachments where stress concentration occurs.

How do I stop my heat exchanger from vibrating?

To avoid acoustic vibrations, the natural vibration frequency of the transverse gas column must be separated from the frequency of vortex separation by no less than 20%.

How do you reduce vibration in shell and tube heat exchanger?

Baffle thickness and tube hole size. The thickness of baffles and the tube-to-baffle clearance can affect the magnitude of forces acting on the tube-to-baffle hole interface. Increasing the baffle thickness and reducing the tube-to-baffle clearance can reduce the potential for vibration.

Does wind vibrate?

The phenomenon know as Aeolian (or Second Mode) Vibration is caused by low-velocity, steady winds, normally ranging from 5-35mph and giving rise to frequencies of 2-20hz. This vibration is believed to be predominantly caused by air vortexing around the structure.