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Open AccessArticle

The Effect of Moment of Inertia on the Liquids in Centrifugal Microfluidics

Mechanical Engineering Department, Iran University of Science and Technology, 1684613114 Tehran, Iran
Lab-on-a-disc Technology Center (LTC), Iranian Research Organization for Science and Technology (IROST), Ahmadabad Mostoufi, Azadegan Highway, 3353136846 Tehran, Iran
Science for Life Laboratory, Division of Nanobiotechnology, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
Author to whom correspondence should be addressed.
Academic Editor: Jeong-Bong Lee
Micromachines 2016, 7(12), 215;
Received: 20 August 2016 / Revised: 11 November 2016 / Accepted: 15 November 2016 / Published: 2 December 2016
(This article belongs to the Collection Lab-on-a-Chip)
The flow of liquids in centrifugal microfluidics is unidirectional and dominated by centrifugal and Coriolis forces (i.e., effective only at T-junctions). Developing mechanisms and discovering efficient techniques to propel liquids in any direction other than the direction of the centrifugal force has been the subject of a large number of studies. The capillary force attained by specific surface treatments, pneumatic energy, active and passive flow reciprocation and Euler force have been previously introduced in order to manipulate the liquid flow and push it against the centrifugal force. Here, as a new method, the moment of inertia of the liquid inside a chamber in a centrifugal microfluidic platform is employed to manipulate the flow and propel the liquid passively towards the disc center. Furthermore, the effect of the moment of inertia on the liquid in a rectangular chamber is evaluated, both in theory and experiments, and the optimum geometry is defined. As an application of the introduced method, the moment of inertia of the liquid is used in order to mix two different dyed deionized (DI) waters; the mixing efficiency is evaluated and compared to similar mixing techniques. The results show the potential of the presented method for pumping liquids radially inward with relatively high flow rates (up to 23 mm3/s) and also efficient mixing in centrifugal microfluidic platforms. View Full-Text
Keywords: lab-on-a-chip; microfluidics; inertia; disc; pump; mixing lab-on-a-chip; microfluidics; inertia; disc; pump; mixing
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MDPI and ACS Style

Pishbin, E.; Eghbal, M.; Fakhari, S.; Kazemzadeh, A.; Navidbakhsh, M. The Effect of Moment of Inertia on the Liquids in Centrifugal Microfluidics. Micromachines 2016, 7, 215.

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