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Research Papers: Micro/Nanoscale Heat Transfer

Thermal-Conductivity Enhancement of Microfluids With Ni33-ppza)4Cl2 Metal String Complex Particles

[+] Author and Article Information
Baghir A. Suleimanov

“Oil Gas Scientific Research Project” Institute,
SOCAR,
Baku AZ1122, Azerbaijan
e-mail: Baghir.Suleymanov@socar.az

Hakim F. Abbasov, Fuad F. Valiyev, Rayyat H. Ismayilov

“Oil Gas Scientific Research Project” Institute,
SOCAR,
Baku AZ1122, Azerbaijan

Shie-Ming Peng

Department of Chemistry,
National Taiwan University,
Taipei 10617, Taiwan, China

1Correspondence author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 28, 2018; final manuscript received September 13, 2018; published online November 5, 2018. Assoc. Editor: Amy Fleischer.

J. Heat Transfer 141(1), 012404 (Nov 05, 2018) (6 pages) Paper No: HT-18-1183; doi: 10.1115/1.4041554 History: Received March 28, 2018; Revised September 13, 2018

The thermal conductivity of microfluids comprising Ni33-ppza)4Cl2 metal string complex (MSC) microparticles in an aqueous glycerol solution was investigated using the transient hot-wire method. A comparative analysis of the thermal-conductivity enhancements of microfluids and nanofluids revealed that the best results were achieved using microparticles of monocrystalline MSCs Ni33-ppza)4Cl2 as well as Ni55-pppmda)4Cl2 micro- and copper nanoparticles. Compared to the base fluid, the thermal-conductivity enhancements were 72% for Ni3–water–glycerol, 53% for Cu–water–glycerol, and 47% for Ni5–water–glycerol. It is shown that the high thermal-conductivity enhancement achieved with Ni3 microfluids is a result of higher stability in compare with nanofluid due to the lower density of the microparticles and the formation of particle assemblies. Therefore, the formation of hydrogen bonds between the MSC particles (through their organic fragments) and water molecules, takes place. Colloidal structure of Ni3-microfluids has a significant impact on their thermophysical properties.

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Figures

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Fig. 1

(a) Crystal structure of Ni33-ppza)4Cl2 (where X = 1/2N + 1/2C). The thermal ellipsoids are at the 30% probability level and hydrogen atoms are omitted for clarity. (b) Hydrogen bonds (dashed lines) between MSC particles (through their organic fragments) and water molecules.

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Fig. 2

Stabilization of particle size of monocrystalline metal string Ni33-ppza)4Cl2 complex (5 vol %) in base fluid

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Fig. 3

Process of measuring fluid thermal conductivity using the transient hot-wire method

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Fig. 4

Scanning electron microscope images of microparticles of MSC Ni33-ppza)4Cl2 (1 vol %) in base fluid

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Fig. 5

Concentration dependence of thermal-conductivity enhancement for Ni3–water–glycerol

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Fig. 6

Thermal-conductivity enhancement of nano- and microfluids at a particle volume fraction of φ = 5 vol %

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Fig. 7

The dependence of viscosity on shear rate for Ni3-microfluid at temperature of 25 °C

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Fig. 8

Concentration dependence of surface tension of Ni3–water–glycerol

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Fig. 9

Concentration dependence of freezing point of Ni3–water–glycerol

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Fig. 10

The freezing temperatures of the systems studied

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