Research and development of a new quantitative flow visualization technique for micro-scale flow field based on quantum dots

2015 Fiscal Year Research-status Report

• Project/Area Number: 15K17967
• Research Institution: Ibaraki University
• Principal Investigator: 李 艶栄 茨城大学, 工学部, 講師 (20712821)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Keywords: Flow visualization / Quantum dots / Micro PIV

Outline of Annual Research Achievements

Tracer particles (quantum dots), which can be used in a micro-scale PIV system, were prepared and synthesized. Properties of the synthesized tracer particles were characterized.
The behavior of the luminescent emission of QDs with temperature was characterized; The luminescence intensity of emission of QDs was investigated; The position of λ peak as a function of temperature was evaluated; The full width at half maximum (FWHM) characteristics changing with temperature was characterized.
To obtain the behavior of the luminescent emission of QDs with temperature, the emission spectrum of the QDs solution at different temperature was detected by a spectrometer. Then, the position of emission peak as a function of temperature, the luminescence intensity of QDs with temperature, the FWHM variation as a function of the temperature, through the post-processing of the obtained emission spectrum were obtained.

Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

Research plan during the year of 2015 was achieved.

Strategy for Future Research Activity

Apply QDs into two-dimensional temperature and velocity distribution measurement in a micro-scale PIV system.
The experimental validation will be carried out to obtain the two-dimensional velocity and temperature distributions during a mixing process of hot water and cold water inside a Y-shaped micromixer. The flow is assumed to be two-dimensional. The temperatures of the hot water and the cold water will be set at Th and Tc. The temperature difference, Th - Tc, will be maintained at zero during calibration of the proposed technique and will be varied systematically during the experiments. The temperature of the hot water and cold water will be controlled constant in a water pool.