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Amplifying thermal conduction calibre of dielectric nanocolloids employing induced electrophoresis
Harikrishnan Anilakkad Raman, Chandan Rajput
Published in Elsevier Inc.
2019
Volume: 106
   
Pages: 138 - 147
Abstract
Electrophoresis has been shown as a novel methodology to enhance heat conduction capabilities of nanocolloidal dispersions. A thoroughly designed experimental system has been envisaged to solely probe heat conduction across nanofluids by specifically eliminating the buoyancy driven convective component. Electric field is applied across the test specimen in order to induce electrophoresis in conjunction with the existing thermal gradient. It is observed that the electrophoretic drift of the nanoparticles acts as an additional thermal transport drift mechanism over and above the already existent Brownian diffusion and thermophoresis dominated thermal conduction. A scaling analysis based on the thermophoretic and electrophoretic velocities from classical Huckel-Smoluchowski formalism is able to mathematically predict the thermal performance enhancement due to electrophoresis. It is also inferred that the dielectric characteristics of the particle material is the major determining component of the electrophoretic amplification of heat transfer. Influence of surfactants has also been probed into and it is observed that enhancing the stability via interfacial charge modulation can in fact enhance the electrophoretic drift, thereby enhancing heat transfer calibre. Also, surfactants ensure colloidal stability as well as chemical gradient induced recirculation, thus ensuring colloidal phase equilibrium and low hysteresis in spite of the directional drift in presence of electric field forcing. The findings may have potential implications in enhanced and tunable thermal management of micro-nanoscale devices and in thermo-bioanalysis within lab-on-a-chip devices. © 2019 Elsevier Inc.
About the journal
JournalData powered by TypesetExperimental Thermal and Fluid Science
PublisherData powered by TypesetElsevier Inc.
ISSN08941777
Open AccessNo
Concepts (17)
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    Chemical stability
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    Dielectric materials
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    Electric fields
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    Heat conduction
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    Nanofluidics
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    Sols
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    Surface active agents
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    Thermophoresis
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    CONVECTIVE COMPONENTS
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    DIELECTRIC CHARACTERISTICS
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    ELECTROPHORETIC VELOCITY
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    ENHANCING HEAT TRANSFER
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    Lab-on-a-chip devices
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    Nanofluids
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    Smart fluids
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    THERMAL PERFORMANCE ENHANCEMENTS
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    Electrophoresis