Author(s): Yu Han; Xin Zhang; Shu-Qing Yang; Nadeesha Dharmasiri; Woo Taek Hong
Linked Author(s): Shuqing Yang
Keywords: LDA; Mean velocity; Statistical error; Particle seeding; Concentration
Abstract: A Laser Doppler Anemometer was used to measure the mean flow and turbulence in fluid experiments. Generally, the experiments will chose a sufficiently large data size to produce measurements free of statistical error, even with high turbulence intensity. However, there is no relative experimental validation to determine the reasonable data size for LDA system. This paper first proposes the reasonable data size to ensure a mean velocity calculation free of bias. Moreover, the effects of particle seeding concentration on the measurements of velocity were also considered. Throughout the experimental process the particle velocities were measured using a Dantec 2-D LDA system. To describe the effects of data size and particle seeding concentration, this paper will also address the reasonable data size and range of concentration in the design of water flow prior to any experimental application.
Year: 2015