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Study of Suspended Droplets by Laser Attenuation Method

YASIN, FARAH QURSIAH (2011) Study of Suspended Droplets by Laser Attenuation Method. Universiti Teknologi Petronas. (Unpublished)

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Abstract

This study investigates the properties of suspended particles by usmg laser attenuation measurement system with reference to the Beer-Lambert's Law. These suspended particles either solid particles or liquid droplets are not visible in the air due to their fine sizes (smaller than 2.5 pm ). Fundamentally, laser attenuation is defined as a technique in measuring reduction or attenuation of light intensity of a laser beam due to its passage through a body. The portion of incident flux is reflected at the entrance and exit surfaces and another portion is absorbed while the remainder is transmitted. Quantification of the properties of particles and droplets is important due to various applications; for instance, to measure size and velocity of droplets of spray painting to reduce the environmental effects, to study flows inside engines and obtaining important data on the fuel injection to improve the fuel efficiency. A system that applies laser attenuation was developed in a past research work and was proved as a reliable measurement system but to deepen the understanding in suspended particles, several experiments have been added and some modification has been done to improve the measurement system. The objectives of this project are to study experimentally the properties of various specimens by using laser attenuation method and to improve power meter system as well as laser system. For the methodology, it includes gathering information, planning the experiments, modification of the existing measurement system and conducting experiments of smoke, sea water, fog and diesel spray. First experiment which is comparison of both power meters with new modified circuit that afterwards was proved reliable due to increment of voltage value. It will be continued by experiment with smoke. This experiment was conducted to quantifY the extinction coefficient of smoke. The laser beam was incident to a Perspex container containing sea water and fresh water for third experiment which concern with absorbance value. The sea water has greater absorbance compared to fresh water as the voltage recorded is much lower. Next was experiment to study the scattering effect of fog. Last but not least was the experiment with diesel spray where the diesel atomization was introduced within the measurement system in order to quantifY the number density. As the pressure of diesel was increased, more particles will absorb the laser beam due to higher angle of spray.

Item Type: Final Year Project
Academic Subject : Academic Department - Mechanical Engineering - Petroleum
Subject: T Technology > TJ Mechanical engineering and machinery
Divisions: Engineering > Mechanical
Depositing User: Users 2053 not found.
Date Deposited: 09 Oct 2013 11:07
Last Modified: 25 Jan 2017 09:42
URI: http://utpedia.utp.edu.my/id/eprint/8603

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