Study of Liquid Flow with Air Bubbles in a Pipe

Kamarudin, Nur Azmel Zaa (2011) Study of Liquid Flow with Air Bubbles in a Pipe. [Final Year Project] (Unpublished)

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The existence ofbubbles in liquid flow causes problems in various applications involving
pipelines such as pressure drop through pipeline, vibration, cavitation and multiphase metering.
Bubble sizes are critical in determining the production rate of gas lift mechanism. Thus, the
objective of this project is to conduct fundamental study of the behavior of bubbles in liquid flow
in pipe is required as to control bubbles which would help to reduce pressure drop and vibration
as it could minimize energy loss, besides reduces the chances of cavitation. The study would
involve experimental analysis of the characteristics of fluid flow, the effects of existence of
bubbles or air in turbulent liquid flow on bubble velocity and bubble size distribution.
Experiments were conducted by using cavitation pump rig which includes motor pump, water
flow rate meter, air injector and ball valve, been combined with Laser Doppler Anemometry
(LOA) and Phase Doppler Anemometry (PDA) to analyze the bubbles' diameters and also both
vertical and horizontal velocity of the bubbles injected. The bubbles in liquid flow change their
characteristics across the cross section of the pipe and also from lower elevation to higher
elevation as the eddies phase changes towards steady flow. There is a variation in the diameter of
bubbles along the liquid flow. A higher water flow rate results in smaller bubbles diameter
probably due to high kinetic energy in the water and hence it has less chance to merge. Large
bubbles normally occur near pipe wall and at sections where the velocity of water is relatively

Item Type: Final Year Project
Subjects: T Technology > TJ Mechanical engineering and machinery
Depositing User: Users 2053 not found.
Date Deposited: 30 Oct 2013 16:48
Last Modified: 25 Jan 2017 09:42

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