Abstract:
The main purpose of this study is to investigate flow velocity of organic dye with
different concentration. Organic dye that is applied in this study called Alphazurine A
or known as Triphenylmethane dye. In this study, Laser Doppler Anemometry
technique is developed as a laser based measurement technique which is due to the
Doppler effect of light and the frequency shifting of the laser light. From the
frequency shifting of the particle movement, the evaluation on flow velocity of the
Alphazurine A is obtained because Doppler Effect of light is proportional to the flow
velocity. In this study, five different concentration of organic dye known as
Alphazurine A is prepared by using a process of dilution. The concentration of these
dye were carried from 20% to 100%.Thus, a 'Measure' software is used in this study
to capture, evaluate and analyze a graph obtain during this Laser Doppler
Anemometry measurement. Hence, from analyzing the graph and evaluating flow
velocity, higher concentration which is 1.0 Molar gives a higher velocity of flow
particle with the rate of 1.3217 millisecond and the lower concentration contribute to
the lower speed of velocity gives the value of 1.0230 millisecond. Application areas
related to this study are wind tunnel velocity experiments for testing aerodynamics
and velocity measurement in water flows.
