An evaporation driven pump for microfluidics applications

C. Nie, R. Mandamparambil, A.J.H. Frijns, J.M.J. den Toonder

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

Abstract

We present an evaporation driven micro-pump for micro fluidic applications on a foil. In such a device, the evaporation rate is controlled by the geometry of the channel outlet and its temperature. The evaporation is also influenced by environmental parameters such as air humidity and temperature. Due to the mass conservation at the system level, the evaporation speed at the outlet determines the mass flow in the microchannel. The outlet contains multiple holes forming a porous hexagonal structure. For analyzing the evaporation rate in this device, diffusion based models for both a single droplet and an array of droplets are presented. To calculate the evaporation flux in the case of an array of multiple pores at the outlet, an evaporation correction factor is estimated mathematically. The outcome is validated by experiments. The experimental device is made by laminating three polyethylene terephthalate (PET) sheets and has a total thickness of about 300 µm. The device is fabricated by laser processes. Typical results show that with 1 to 61 pores (diameter=250µm, pitch=500µm), flow rates of 9.01×10-3 to 1.60×10-1 µL/min are achieved, as assessed by a 2-Dimensional Particle Tracking Velocimetry (2D-PTV) method. The results are compared with theoretical values based on a sessile droplet evaporation equation including an evaporation correction factor. The results show a good agreement.
Original languageEnglish
Title of host publicationProceedings of the 5th International Conference on Heat Transfer and Fluid Flow in Microscale (HTFFM-V), 22-25 April 2014, Marseille, France
EditorsL. Tadrist, I. Graur
Place of PublicationMarseille
PublisherECI
Number of pages6
Publication statusPublished - 2014
Event5th International Conference on “Heat Transfer and Fluid Flow in Microscale” (2014) - Marseilles, France
Duration: 22 Apr 201426 Apr 2014

Conference

Conference5th International Conference on “Heat Transfer and Fluid Flow in Microscale” (2014)
Abbreviated titleHTFFM-V
CountryFrance
CityMarseilles
Period22/04/1426/04/14
Other5th International Conference on “Heat Transfer and Fluid Flow in Microscale”

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