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Joule Heating and Chip Materials

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Encyclopedia of Microfluidics and Nanofluidics

Synonyms

Joule-heating effect; Ohmic heating

Definition

Joule heating is named for James Prescott Joule, the first to articulate what is now Joule’s law, relating the amount of heat released from an electrical resistor to its resistance and the charge passed through it. Joule’s law gives the amount of heat Q liberated by a current I flowing through a resistor with a resistance R for a time t:

$$ Q= Pt={I}^2 Rt. $$

An electrokinetic flow in a chip is a flow of liquid in a channel driven by an electric field.

Overview

When experiments are carried in microfluidic channels, forces are needed to drive liquids to flow through the microchannels. Electrokinetics is now being studied in a variety of forms, such as electroosmosis, dielectrophoresis, and electrowetting, for the purpose of controlling microflows in chips. While electrokinetic methods can greatly simplify species transport in microfluidic systems, a significant characteristic is the internal generation of heat (i.e., Joule heating)...

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Author information

Authors and Affiliations

  1. Department of Chemistry, Tsinghua University, Beijing, People’s Republic of China

    Hui Yan

  2. Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China

    Hongkai Wu

Authors
  1. Hui Yan
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  2. Hongkai Wu
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Editor information

Editors and Affiliations

  1. VU Station B 351592, Vanderbilt University Dept. Mechanical Engineering, Nashville, Tennessee, USA

    Dongqing Li

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© 2014 Springer Science+Business Media New York

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Yan, H., Wu, H. (2014). Joule Heating and Chip Materials. In: Li, D. (eds) Encyclopedia of Microfluidics and Nanofluidics. Springer, Boston, MA. https://doi.org/10.1007/978-3-642-27758-0_758-2

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  • DOI: https://doi.org/10.1007/978-3-642-27758-0_758-2

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  • Publisher Name: Springer, Boston, MA

  • Online ISBN: 978-3-642-27758-0

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