Transient measurement of the thermal conductivity as a tool for the evaluation of the stability of nanofluids subjected to a pressure treatment

被引：14

作者：

Martinez, Victor A. ^{[1
]}

Vasco, Diego A. ^{[1
]}

Garcia-Herrera, Claudio M. ^{[1
]}

机构：

[1] Univ Santiago de Chile, Dept Ingn Mecan, Ave Bernardo OHiggins, Santiago 3363, Chile

来源：

INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER | 2018年 / 91卷

关键词：

Nanofluids; Stability; Two-step method; Thermal conductivity; Pressure treatment; PHYSICAL PROPERTIES; WATER NANOFLUIDS; NANOPARTICLES; SURFACTANT;

D O I：

10.1016/j.icheatmasstransfer.2017.12.016

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Nanofluids are a type of composite material with a demonstrated potential for improving heat transfer processes present in industries such as computers, electronics, and automobile. However, they have a limitation, which is that the suspended nanoparticles tend to agglomerate and in that way decrease their thermophysical properties. The present work studies experimentally the stability of a nanofluid synthesized with TiO2 nanoparticles (6 nm) dispersed by continuous ultrasonication in water, determining the effect that exposure of the nanofluid to an atmosphere pressurized with N-2 at 1000 kPa has on its stability. A method is proposed for the quantitative measurement of the stability of a nanofluid based on the transient study of its thermal conductivity and the implementation of a model that describes such behavior. The results allow inferring statistically that the pressure treatment improves the stability of the nanofluid due to a presumed decrease of the average diameter of the agglomerations of the suspended nanoparticles. However, this improvement depends on the temperature.

引用

页码：234 / 238

页数：5

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