CN113111604A - Method for researching influence degree of nano particle oxidation on nano fluid viscosity - Google Patents
Method for researching influence degree of nano particle oxidation on nano fluid viscosity Download PDFInfo
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Abstract
The invention compares three nanofluids under different conditions, namely a nanofluid of Cu and CuO mixed particles, a nanofluid of only Cu nanoparticles and a nanofluid of only CuO particles, and the viscosity change of the three nanofluids is utilized to research whether the properties of the nanofluid are influenced by the nanoparticles in the nanofluid if the nanoparticles are oxidized or not. Three groups of nanofluids with different mixed particles are constructed, wherein the first group comprises three Cu particles and one CuO particle, the second group comprises two Cu particles and two CuO particles, and the last group comprises one Cu particle and three CuO particles, the viscosities of the three nanofluids are respectively calculated, the viscosities of the five nanofluids are compared, and the influence of the gradual oxidation of the nanoparticles to the full oxidation on a nanofluid system is summarized.
Description
Technical Field
The invention belongs to the technical field of micro-nano scale heat transfer molecular simulation, and relates to a method for researching whether nano particle oxidation influences the viscosity of a nano fluid or not, and the degree of influence of the oxidation degree on the viscosity of the nano fluid.
Background
With the development towards smaller and higher integrated conditions in the period, the microchannel heat dissipation is a novel means for heat dissipation of devices, the nano fluid is mainly used for heat dissipation in the microchannel, but with the increase of service life, nano particles in the nano fluid can be oxidized, so that the heat dissipation capability is reduced, if the devices are not timely cooled, the devices can be damaged, the functions are seriously directly lost, the cost requirement is increased, and the research on the nano particles of the nano fluid is particularly important.
Disclosure of Invention
The invention aims to provide a method for researching whether the oxidization of nanoparticles influences the viscosity of a nano fluid, which can calculate the viscosity of the nano fluid containing different nanoparticles by using a molecular dynamics simulation method, and research whether the oxidization of the nanoparticles influences the properties of the nano fluid and the degree of the oxidization influences the viscosity of the nano fluid.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method of investigating whether nanoparticle oxidation will have an effect on nanofluid viscosity, the method comprising the steps of:
step 1: constructing nanofluid models of a plurality of oxidized nanoparticles with different degrees, and selecting water as a base fluid of the nanofluid;
step 2: setting a required potential function, adopting an SPC/E force field potential function for the base liquid water, adopting an L-J potential function between the metal and the metal oxide, and calculating the interaction force between atoms by using a Lorentz bethelot mixing rule;
and step 3: selecting an ensemble NPT and NVT balance nanofluid model;
and 4, step 4: selecting the NVE output data of the ensemble, calculating the viscosity of the nanofluid by using a G-K formula,
wherein mu, V, T, kBAnd P are the off-diagonal components of shear viscosity, volume, temperature, boltzmann constant and pressure tensor, respectively;
and 5: performing post-processing on the output data, calculating a pressure autocorrelation function and the viscosity of the nano fluid under stress in each direction, and averaging the pressure autocorrelation function and the viscosity to obtain the viscosity value of the nano fluid;
step 6: the viscosity of nanofluids made up of nanoparticles oxidized to different degrees was compared and the effect on the nanofluidic system was summarized when the nanoparticles were gradually oxidized to the point where oxidation was complete.
The nanofluids oxidized to different degrees are divided into five types, namely: (1) 4 nanofluids of Cu nanoparticles; (2) contains 3 Cu particles and 1 CuO particle; (3) 2 Cu particles and 2 CuO particles; (4) containing 1 Cu particle and 3 CuO particles; (5) a nanofluid consisting of 4 CuO nanoparticles.
In simulation calculation, all the nanofluids contain 2.48% of nanoparticles by volume fraction, the temperature range is 290K-360K, 10K is used as an interval, and the viscosity changes of five different nanofluids under 8 groups of different temperatures are calculated.
The invention determines the state of the nano particles in the nano fluid by simulating the viscosity of the nano fluid, and the degree of influence of the oxidation degree on the viscosity of the nano fluid.
Drawings
Fig. 1 is a flow chart in a simulation process.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and detailed description.
A method of investigating whether nanoparticle oxidation will have an effect on nanofluid viscosity, the method comprising the steps of:
step 1: constructing nanofluid models of a plurality of oxidized nanoparticles with different degrees, and selecting water as a base fluid of the nanofluid;
step 2: setting a required potential function, adopting an SPC/E force field potential function for the base liquid water, adopting an L-J potential function between the metal and the metal oxide, and calculating the interaction force between atoms by using a Lorentz bethelot mixing rule;
and step 3: selecting an ensemble NPT and NVT balance nanofluid model;
and 4, step 4: selecting the NVE output data of the ensemble, calculating the viscosity of the nanofluid by using a G-K formula,
in the formula
、V、T、kBAnd P are the off-diagonal components of shear viscosity, volume, temperature, boltzmann constant and pressure tensor, respectively;
and 5: performing post-processing on the output data, calculating a pressure autocorrelation function and the viscosity of the nano fluid under stress in each direction, and averaging the pressure autocorrelation function and the viscosity to obtain the viscosity value of the nano fluid;
step 6: the viscosity of nanofluids made up of nanoparticles oxidized to different degrees was compared and the effect on the nanofluidic system was summarized when the nanoparticles were gradually oxidized to the point where oxidation was complete.
The nanofluids oxidized to different degrees are divided into five types, namely: (1) 4 nanofluids of Cu nanoparticles; (2) contains 3 Cu particles and 1 CuO particle; (3) 2 Cu particles and 2 CuO particles; (4) containing 1 Cu particle and 3 CuO particles; (5) a nanofluid consisting of 4 CuO nanoparticles.
In simulation calculation, all the nanofluids contain 2.48% of nanoparticles by volume fraction, the temperature range is 290K-360K, 10K is used as an interval, the viscosity changes of five different groups of nanofluids at different temperatures are calculated, and the state of the nanoparticles in the nanofluids is determined by simulating the viscosity of the nanofluids.
Finally, the method can be used to determine the state of oxidation of different metals or metal oxides, such as: fe, Al, etc.
Claims (3)
1. A method of investigating whether nanoparticle oxidation will affect nanofluid viscosity, comprising:
step 1: constructing nanofluid models of a plurality of oxidized nanoparticles with different degrees, and selecting water as a base fluid of the nanofluid;
step 2: setting a required potential function, adopting an SPC/E force field potential function for the base liquid water, adopting an L-J potential function between the metal and the metal oxide, and calculating the interaction force between atoms by using a Lorentz bethelot mixing rule;
and step 3: selecting an ensemble NPT and NVT balance nanofluid model;
and 4, step 4: selecting the NVE output data of the ensemble, calculating the viscosity of the nanofluid by using a G-K formula,
in the formula
、V、T、kBAnd P are the off-diagonal components of shear viscosity, volume, temperature, boltzmann constant and pressure tensor, respectively;
and 5: performing post-processing on the output data, calculating a pressure autocorrelation function and the viscosity of the nano fluid under stress in each direction, and averaging the pressure autocorrelation function and the viscosity to obtain the viscosity value of the nano fluid;
step 6: the viscosity of nanofluids made up of nanoparticles oxidized to different degrees was compared and the effect on the nanofluidic system was summarized when the nanoparticles were gradually oxidized to the point where oxidation was complete.
2. The method for investigating whether nanoparticle oxidation will affect nanofluid viscosity according to claim 1, wherein the nanofluid model in step 1 of the method comprises five nanofluids with different oxidation degrees, which are: (1) 4 nanofluids of Cu nanoparticles; (2) contains 3 Cu particles and 1 CuO particle; (3) 2 Cu particles and 2 CuO particles; (4) containing 1 Cu particle and 3 CuO particles; (5) a nanofluid consisting of 4 CuO nanoparticles.
3. The method for researching whether the oxidization of the nano particles can affect the viscosity of the nano fluid according to claim 2, wherein the models in the method are all nano fluids containing 2.48% of nano particles by volume fraction in simulation calculation, the temperature range is 290K-360K, and the viscosity change of five different nano fluids at 8 groups of different temperatures is calculated by taking 10K as an interval, so that the state of the nano particles and the influence of the oxidization degree on the viscosity of the nano fluid are determined by the viscosity of the nano fluid.
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Citations (4)
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| US20160376486A1 (en) * | 2015-06-26 | 2016-12-29 | King Fahd University Of Petroleum And Minerals | Nanofluids containing carbon nanotubes and metal oxide nanoparticle composites with enhanced heat transfer and heat capacity properties |
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| WO2019194686A1 (en) * | 2018-04-05 | 2019-10-10 | University Of The Philippines Los Banos | Nanosilica from rice hull ash as a component of a nanofluids coolant and methods thereof |
| CN112380790A (en) * | 2020-11-11 | 2021-02-19 | 桂林电子科技大学 | EMD method for calculating nano fluid viscosity of nano particles with different shapes |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160376486A1 (en) * | 2015-06-26 | 2016-12-29 | King Fahd University Of Petroleum And Minerals | Nanofluids containing carbon nanotubes and metal oxide nanoparticle composites with enhanced heat transfer and heat capacity properties |
| WO2019194686A1 (en) * | 2018-04-05 | 2019-10-10 | University Of The Philippines Los Banos | Nanosilica from rice hull ash as a component of a nanofluids coolant and methods thereof |
| CN109883649A (en) * | 2019-03-14 | 2019-06-14 | 北京石油化工学院 | The method for studying nano-fluid flow behavior in nanochannel by simulation model |
| CN112380790A (en) * | 2020-11-11 | 2021-02-19 | 桂林电子科技大学 | EMD method for calculating nano fluid viscosity of nano particles with different shapes |
Non-Patent Citations (5)
| Title |
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| MA KEDZIERSKI ET AL: "Viscosity and density of CuO NANOLUBRICANT", 《INTERNATIONAL JOURNAL OF REFRIGERATION》 * |
| 刘佳伟: "纳米流体对内燃机动接触燃烧室部件润滑摩擦特性影响初探", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅰ辑》 * |
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