A simple and novel way of maintaining constant wall temperature in microdevices

Duryodhan, V S and Singh, A and Singh, Shiv Govind and Agrawal, A (2016) A simple and novel way of maintaining constant wall temperature in microdevices. Scientific Reports. pp. 1-15. ISSN 2045-2322

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Constant wall temperature /homogeneity in wall temperature is the need of various lab-on-chip devices employed in biological and chemical investigations. However method to maintain this condition does not seem to be available. In this work, a novel and simple way of maintaining constant wall temperature is proposed. A diverging microchannel along with conjugate effects is utilized towards this end. Both measurements and three dimensional numerical simulations are undertaken to prove the design. The investigation has been carried out over a large parameter range (divergence angle: 1–8°; length: 10–30 mm; depth: 86–200 μm; solid-to-fluid thickness ratio: 1.5–4.0, and solid-to-fluid thermal conductivity ratio: 27–646) and input conditions (mass flow rate: 4.17 × 10−5 −9.17 × 10−5 kg/s, heat flux: 2.4–9.6 W/cm2) which helped in establishing the finding. It is observed that a nearly constant wall temperature condition can be achieved over a large parameter range investigated. A model to arrive at the design parameter values is also proposed. The method is further demonstrated for series of microchannels where we successfully maintain each station at different temperature within ±1 °C. The finding is therefore significant and can be employed in both single and multi-stage processes such as PCR requiring different constant wall temperature with a fine resolution.

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IITH Creators:
IITH CreatorsORCiD
Singh, Shiv Govindhttp://orcid.org/0000-0001-7319-879X
Item Type: Article
Subjects: Others > Electricity
Others > Engineering technology
Divisions: Department of Electrical Engineering
Depositing User: Team Library
Date Deposited: 11 Feb 2016 11:35
Last Modified: 16 Jan 2019 09:00
URI: http://raiith.iith.ac.in/id/eprint/2182
Publisher URL: https://doi.org/10.1038/srep18230
OA policy: http://www.sherpa.ac.uk/romeo/issn/2045-2322/
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