Measurement and modeling of pulsatile flow in microchannel

Tikekar, M and Singh, Shiv Govind and Agrawal, A (2010) Measurement and modeling of pulsatile flow in microchannel. Microfluidics and Nanofluidics, 9 (6). pp. 1225-1240. ISSN 1613-4982

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An experimental study of pulsatile flow in microchannel is reported in this paper. Such a study is important because time-varying flows are frequently encountered in microdevices. The hydraulic diameter of the microchannel is 144 μm and deionized water is the working fluid. The pressure drop across the microchannel as a function of time is recorded, from which the average and r.m.s. pressure drops are obtained. The experiments have been performed in the quasi-steady flow regime for a wide range of flow rate, frequency of pulsations, and duty cycle. The results suggest that the pressure with pulsations lies between the minimum and maximum steady state pressure values. The average pressure drop with pulsation is approximately linear with respect to the flow rate. The theoretical expression for pressure has also been derived wherever possible and the experimental data is found to lie below the corresponding theoretical values. The difference with respect to the theoretical value increases with an increase in frequency and a decrease in flow rate, with a maximum difference of 32.7%. This is attributed to the small size of the microchannel. An increase in frequency of square waveform leads to a larger reduction in pressure drop as compared to rectangular waveform, irrespective of the duty cycle. The results can be interpreted with the help of a first-order model proposed here; the model results are found to compare well against the experimental results. A correlation for friction factor in terms of the other non-dimensional governing parameters is also proposed. Experimental study of mass-driven pulsatile flow in microchannel is being conducted for the first time at these scales and the results are of both fundamental and practical importance.

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IITH Creators:
IITH CreatorsORCiD
Singh, Shiv Govind
Item Type: Article
Uncontrolled Keywords: Flow modeling; Microchannel; Microfluidics; Microscale flow; Pressure drop; Pulsatile flow;Average pressures; Duty cycles; Experimental data; Experimental studies; First-order models; Flow modeling; Friction factors; Function of time; Governing parameters; Hydraulic diameter; Micro devices; Microscale flows; Model results; Practical importance; Quasi-steady flow; Small size; Square waveform; Steady-state pressures; Theoretical expression; Theoretical values; Time-varying flow; Wave forms; Working fluid
Subjects: Physics > Electricity and electronics
Divisions: Department of Electrical Engineering
Depositing User: Mr. Siva Shankar K
Date Deposited: 13 Oct 2014 06:43
Last Modified: 16 Jan 2019 09:09
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