Gold-in-water nanofluids in microchannels: Surfactant effect

Eylül Şimşek; Matthew Redmond; Aziz Koyuncuoğlu; Tuba Okutucu-Özyurt; Haluk Külah

doi:10.1615/ihtc16.nmt.021973

Gold-in-water nanofluids in microchannels: Surfactant effect

Eylül Şimşek, Matthew Redmond, Aziz Koyuncuoğlu, Tuba Okutucu-Özyurt^*, Haluk Külah

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

Abstract

Heat transfer and pressure drop performance of gold-in-water nanofluids in microchannels are experimentally investigated. Gold nanoparticles are suspended in de-ionized (DI) water. The nanofluid stability is maintained by polyvinylpyrrolidone (PVP) for over 4 years. Nanofluids are tested in rectangular, MEMS produced copper microchannels of 70 µm x 50 µm cross-sectional area in a very low Reynolds number range of 30 < Re < 50. The performances of DI-water, PVP added DI-water, and gold-in-water nanofluid with added PVP are compared. The nanofluids always yielded a higher heat transfer coefficients than PVP-DI water solution. For occasional combinations of the particle size, volumetric concentration and flow rate, gold nanofluids yielded higher heat transfer coefficients compared to DI water as well. The effects of flow rate and particle size on the figure of merit (FM) are presented. The study is rare in dealing with pure metals (gold), and is important in emphasizing the surfactant effects on stable duration of nanofluids, and their thermal performance.

Original language	English
Pages (from-to)	7145-7152
Number of pages	8
Journal	International Heat Transfer Conference
Volume	2018-August
DOIs	https://doi.org/10.1615/ihtc16.nmt.021973
Publication status	Published - 2018
Externally published	Yes
Event	16th International Heat Transfer Conference, IHTC 2018 - Beijing, China Duration: 10 Aug 2018 → 15 Aug 2018

Bibliographical note

Publisher Copyright:
© 2018 International Heat Transfer Conference. All rights reserved.

Funding

This research has been financially supported by the Scientific and Technological Research Council of Turkey under grant number TÜBİTAK 108M515. The second author was a visiting researcher in Turkey on Fulbright scholarship. The SEM images of this study have been taken at METU METE NANOLAB of Dr. Emrah Ünalan.

Funders	Funder number
Ministry of Economy, Trade and Industry
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu	TÜBİTAK 108M515

Keywords

Electronic equipment cooling
Gold-in-water nanofluid
Heat transfer enhancement
Microchannel heat sink
Nano/Micro scale measurement and simulation
Stability

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10.1615/ihtc16.nmt.021973

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title = "Gold-in-water nanofluids in microchannels: Surfactant effect",

abstract = "Heat transfer and pressure drop performance of gold-in-water nanofluids in microchannels are experimentally investigated. Gold nanoparticles are suspended in de-ionized (DI) water. The nanofluid stability is maintained by polyvinylpyrrolidone (PVP) for over 4 years. Nanofluids are tested in rectangular, MEMS produced copper microchannels of 70 µm x 50 µm cross-sectional area in a very low Reynolds number range of 30 < Re < 50. The performances of DI-water, PVP added DI-water, and gold-in-water nanofluid with added PVP are compared. The nanofluids always yielded a higher heat transfer coefficients than PVP-DI water solution. For occasional combinations of the particle size, volumetric concentration and flow rate, gold nanofluids yielded higher heat transfer coefficients compared to DI water as well. The effects of flow rate and particle size on the figure of merit (FM) are presented. The study is rare in dealing with pure metals (gold), and is important in emphasizing the surfactant effects on stable duration of nanofluids, and their thermal performance.",

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doi = "10.1615/ihtc16.nmt.021973",

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AU - Külah, Haluk

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N2 - Heat transfer and pressure drop performance of gold-in-water nanofluids in microchannels are experimentally investigated. Gold nanoparticles are suspended in de-ionized (DI) water. The nanofluid stability is maintained by polyvinylpyrrolidone (PVP) for over 4 years. Nanofluids are tested in rectangular, MEMS produced copper microchannels of 70 µm x 50 µm cross-sectional area in a very low Reynolds number range of 30 < Re < 50. The performances of DI-water, PVP added DI-water, and gold-in-water nanofluid with added PVP are compared. The nanofluids always yielded a higher heat transfer coefficients than PVP-DI water solution. For occasional combinations of the particle size, volumetric concentration and flow rate, gold nanofluids yielded higher heat transfer coefficients compared to DI water as well. The effects of flow rate and particle size on the figure of merit (FM) are presented. The study is rare in dealing with pure metals (gold), and is important in emphasizing the surfactant effects on stable duration of nanofluids, and their thermal performance.

AB - Heat transfer and pressure drop performance of gold-in-water nanofluids in microchannels are experimentally investigated. Gold nanoparticles are suspended in de-ionized (DI) water. The nanofluid stability is maintained by polyvinylpyrrolidone (PVP) for over 4 years. Nanofluids are tested in rectangular, MEMS produced copper microchannels of 70 µm x 50 µm cross-sectional area in a very low Reynolds number range of 30 < Re < 50. The performances of DI-water, PVP added DI-water, and gold-in-water nanofluid with added PVP are compared. The nanofluids always yielded a higher heat transfer coefficients than PVP-DI water solution. For occasional combinations of the particle size, volumetric concentration and flow rate, gold nanofluids yielded higher heat transfer coefficients compared to DI water as well. The effects of flow rate and particle size on the figure of merit (FM) are presented. The study is rare in dealing with pure metals (gold), and is important in emphasizing the surfactant effects on stable duration of nanofluids, and their thermal performance.

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KW - Microchannel heat sink

KW - Nano/Micro scale measurement and simulation

KW - Stability

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DO - 10.1615/ihtc16.nmt.021973

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AN - SCOPUS:85068313539

SN - 2377-424X

VL - 2018-August

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JO - International Heat Transfer Conference

JF - International Heat Transfer Conference

Y2 - 10 August 2018 through 15 August 2018

ER -

Gold-in-water nanofluids in microchannels: Surfactant effect

Abstract

Bibliographical note

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Keywords

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