Method for calculating thermal conductivity coefficients of Au-H2O nanofluid

Abstract

The invention provides a method for calculating thermal conductivity coefficients of an Au-H2O nanofluid. The method comprises the following steps: step 1, a volume fraction phi and a shape factor n of nanoparticles in the nanofluid are acquired, and a static thermal conductivity coefficient ks of the Au-H2O nanofluid is calculated; step 2, a dynamic thermal conductivity coefficient kbc of the Au-H2O nanofluid is calculated; step 3, the increase ratio TCE of an effective thermal conductivity coefficient of the Au-H2O nanofluid is calculated compared with a thermal conductivity coefficient of a base fluid. The method for calculating the thermal conductivity coefficients of the Au-H2O nanofluid can calculate the effective thermal conductivity coefficient of the Au-H2O nanofluid conveniently and effectively, the maximum deviation of a theoretical predicted value with conventional experimental data does not exceed 1.5%, and one heat conduction mechanism of the Au-H2O nanofluid with extremely low volume fraction is provided and can explain the phenomenon of great increase of the thermal conductivity coefficients of the Au-H2O nanofluid.

Description

technical field [0001] The invention relates to the technical field of calculation methods for the effective thermal conductivity of nanofluids, in particular to a very low volume fraction Au-H 2 Calculation method for the effective thermal conductivity of O nanofluids. Background technique [0002] A large number of experimental studies have shown that adding nanoparticles to the base fluid can significantly increase the thermal conductivity of the fluid and enhance heat transfer. Although the interactions between particles and particles, particles and liquids, and particles and walls in nanofluids are very complex, their successful application in enhancing heat transfer has aroused the research interest of many scholars. In the past two decades, the heat conduction mechanism of nanofluids has been a research hotspot of scholars from all walks of life. [0003] Although relevant researchers have introduced concepts such as nanolayers and liquid film layers (that is, the s...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of extremely low concentration Au-H in the prior art. 2 The calculated results of the thermal conductivity of O nanofluids are quite different from the experimental data, and the calculation is inaccurate, which provides a kind of Au-H 2 Calculation method of thermal conductivity of O nanofluid

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