Simultaneous velocity profile and temperature profile measurements in microfluidics

Publikation: Beitrag in FachzeitschriftForschungsartikelBeigetragenBegutachtung



Simultaneous non-intrusive temperature and velocity measurements in flows are of high technological interest, e.g. to study the heat transfer in microfluidic environments. However, a measurement system that offers a low velocity uncertainty and micrometre spatial resolution as well as highly accurate temperature measurements in a single device has not been demonstrated so far. In this work, this problem is solved by combining a Laser Doppler Velocity Profile Sensor (LDV-PS) with Laser-Induced Fluorescence (LIF). Seeding particles are employed, that contain the fluorescent dyes uranine and rhodamine B. The multiple dye approach eliminates the influence of the droplet size. Relative velocity uncertainties of down to 0.4% and a temperature uncertainty of down to 0.24C with a spatial resolution of 10μm are achieved in a demonstration air flow experiment. The method has the potential to be optimised for different temperature ranges and uncertainty requirements, making it applicable on a wide range of thermal flows like fuel cells or microbioreactors. A better understanding of heat exchange processes can improve the energy efficiency of microfluidic devices.


FachzeitschriftFlow measurement and instrumentation
PublikationsstatusVeröffentlicht - März 2022

Externe IDs

WOS 000744536000005
unpaywall 10.1016/j.flowmeasinst.2021.102106


Ziele für nachhaltige Entwicklung


  • Laser Doppler velocimetry, Laser Doppler velocity profile sensor, Laser-induced fluorescence, Microfluidics, Optical flow measurement, Optical temperature measurement