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Method for determining nano-fluid suspension stability

A technology of suspension stability and nanofluid, applied in the field of physics, can solve the problems of non-representative quantity, incapable of quantitative analysis and complexity of gravity sedimentation method, and achieve the effect of quantitative analysis, simple method and easy realization

Inactive Publication Date: 2014-04-09
TIANJIN UNIV OF COMMERCE
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Problems solved by technology

However, these methods have certain limitations, such as the gravity sedimentation method cannot carry out quantitative analysis, the spectrophotometer method is only suitable for measuring the suspensio

Method used

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  • Method for determining nano-fluid suspension stability
  • Method for determining nano-fluid suspension stability
  • Method for determining nano-fluid suspension stability

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Experimental program
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Embodiment

[0034] 1. The measurement process is as follows:

[0035] (1) The 2401-M ​​conductivity electrode 1, the MP522 precision pH / conductivity meter 2 and the computer 3 constitute the experimental device. Turn on the pH / conductivity meter and preheat it for 30 minutes. According to the method introduced by the instrument, first use the standard solution to calibrate the conductivity electrode, then clean the conductivity electrode with deionized water and dry it before starting the measurement.

[0036] (2) Put the probe into the freshly prepared CuO / deionized water nanofluid suspension, shake the conductivity electrode gently to make it fully contact with the solution and let it stand still.

[0037] (3) Wait until the displayed value is stable, read the data, and record the measured temperature.

[0038] (4) Each value was measured 5 times, and the average value was taken as the experimental result. It was found that the deviation between each experimental value and the average ...

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Abstract

A disclosed method for determining nano-fluid suspension stability comprises: on the basis of the relationship of particle mass fraction and conductivity of an electrolyte fluid suspension in Maxwell electromagnetic theory, taking a nano-fluid as a mixture same to an electrolyte solution, taking the base fluid of the nano-fluid as the conductor and taking nano-particles in the nano-fluid as small spheres distributed in the conductor, so as to establish a model; measuring the conductivity of various nano-fluids with known mass fraction, fitting to obtain a relation expression between the conductivity of nano-fluids and mass fraction of nano-particles contained in the corresponding nano-fluids; and measuring the any-moment conductivity of a nano-fluid of which the suspension stability is to be determined, according to the fit relation expression of nano-fluid conductivity and mass fraction, obtaining the mass fraction of the nano-fluid of which the suspension stability is to be determined, and determining the stability of the nano-fluid of which the suspension stability is to be determined. The determination method is simple and easy to realize, can help to realize quantitative analysis and is not restricted by particle concentration and quantity.

Description

technical field [0001] The invention relates to the technical field of physics, in particular to a method for establishing a model using the relationship between particle mass fraction and conductivity in electrolyte suspension in Maxwell's electromagnetic theory to determine the suspension stability of nanofluid. Background technique [0002] Nanofluid is a heat exchange working medium formed by adding nanoscale particles to liquid in a certain way and proportion. Nanofluids can not only significantly improve the thermal conductivity of traditional heat exchange media, but also increase the diffusion coefficient. Therefore, nanofluids play an important role in enhancing heat and mass transfer. [0003] On the one hand, the nanoparticles keep doing irregular Brownian motion and keep suspended in the base fluid against the force of gravity; It is easy to agglomerate in the liquid and form a precipitate. The stability of nanofluids is usually improved by adding dispersant or...

Claims

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Application Information

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IPC IPC(8): G01N15/04
Inventor 苏新军王亚妹
Owner TIANJIN UNIV OF COMMERCE
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