Dependence of concemtration on flow velocity by using hellium-neon laser

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.