High-heat conductivity coefficient water-based nanofluid and preparation method thereof

A nanofluid, high thermal conductivity technology, applied in the direction of chemical instruments and methods, heat exchange materials, etc., can solve the problems of unfavorable formation of uniform and stable suspension, unreasonable composition of nanofluid materials, and affecting the thermal conductivity of nanofluid, etc., to achieve Improve the effect of high efficiency, low resistance, compactness, improved thermal conductivity, and less content

Inactive Publication Date: 2014-11-26
ZHONGSHAN FLASHLIGHT POLYTECHNIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] For example, the patent document whose publication number is "CN1115372C" discloses a nanofluid material that can be used as a heat transfer cooling fluid. % liquid medium and 0.2%-0.5% dispersant or surfactant, the composition of this nanofluid material is unreasonable, the content of nanoparticle particles is large, resulting in high collision frequency between nanoparticles in nanofluid, easy to Cause pa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of 0.10 wt % Cu-water nanofluids.

[0027] Components: Cu nanoparticles 0.10g; distilled water 99.80; sodium dodecylbenzenesulfonate 0.10g.

[0028] The preparation method is as follows:

[0029] 1. Mix 0.10g of Cu nanoparticles, 99.80g of distilled water and 0.10g of sodium dodecylbenzene sulfonate (SDBS) (at room temperature and pressure), stir for 5 minutes until completely dissolved to make a suspension.

[0030] 2. Use 0.1mol / L HCl or 0.1mol / L NaOH solution to adjust the pH value of the suspension to 8.5-9.5, then ultrasonically vibrate for about 2 hours under the condition of ultrasonic frequency of 40KHz and temperature of 20-25℃ (normal pressure) , a 0.10 wt % Cu-water nanofluid was obtained. The suspension had good dispersibility and stability, and could be stably maintained for about 30 days, and its thermal conductivity was about 12.5% ​​higher than that of the water working fluid.

[0031] In the stable dispersion of water-based nanofluids, whe...

Embodiment 2

[0034] Preparation of 0.15 wt % Al 2 O 3 - Water nanofluids.

[0035] Component: Al 2 O 3 Nanoparticles 0.15g; distilled water 99.73g; sodium dodecylbenzenesulfonate 0.12g.

[0036] The preparation method is as follows:

[0037] 1. Add 0.15gAl 2 O 3 Nanoparticles, 99.73g of distilled water and 0.12g of sodium dodecylbenzenesulfonate (SDBS) are mixed (at room temperature and pressure), stirred for 5 minutes until completely dissolved to prepare a suspension.

[0038] 2. Use 0.1mol / L HCl or 0.1mol / L NaOH solution to adjust the pH value of the suspension to 8.0-9.0, and then ultrasonically vibrate for about 2 hours under the condition of ultrasonic frequency of 40KHz and temperature of 20-25℃ (normal pressure) , resulting in 0.15 wt % Al 2 O 3 -Water nanofluid suspension, the dispersion and stability of the suspension are good, can be maintained for about 30 days, and its thermal conductivity is about 10.1% higher than that of water working medium.

Embodiment 3

[0040] Preparation of 0.05wt% carbon nanotube-water nanofluid.

[0041] Components: 0.05g of carbon nanotube nanoparticles; 99.90g of distilled water; 0.05g of cetyltrimethylammonium bromide.

[0042] The preparation method is as follows:

[0043] 1. Mix 0.05g of carbon nanotube nanoparticles, 99.90g of distilled water and 0.05g of cetyltrimethylammonium bromide (CTAB), (at room temperature and pressure), stir for 5 minutes until completely dissolved, and make a suspension.

[0044] 2. Use 0.1mol / L HCl or 0.1mol / L NaOH solution to adjust the pH value of the suspension to 8.0-9.0, and then ultrasonically vibrate for about 2 hours under the condition of ultrasonic frequency of 40KHz and temperature of 20-25℃ (normal pressure) , to obtain a suspension. The suspension has good dispersibility and stability, and can be maintained for about 60 days. Compared with the water working medium, its thermal conductivity is increased by about 15.8%.

[0045] The invention directly mixes th...

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Abstract

The invention discloses high-heat conductivity coefficient water-based nanofluid and a preparation method thereof. The high-heat conductivity coefficient water-based nanofluid is prepared from the following raw materials in percentage by weight: 0.05-0.15 percent of nanoparticles, 99.73-99.90 percent of distilled water and 0.05-0.12 percent of dispersing agent. The water-based nanofluid stable in suspension prepared by adopting a two-step method is simple in process and low in cost, the nanoparticles in the nanofluid are small in particle size, low in content and narrow in distribution range, the collision frequency among the nanoparticles is low, the dispersing stability is high and can be stably maintained for 30-60 days, compared with that of a water medium, the heat conductivity coefficient of the nanofluid is increased by 10.1-15.8 percent, the nanofluid is widely applied to the fields of aerospace, electronics, medical treatment, chemical industry, buildings and foods, high-efficiency low-resistance compaction and other performance indexes of heat exchange equipment can be greatly improved, and the volume of the heat exchange equipment is reduced.

Description

technical field [0001] The invention relates to a heat transfer or cooling working medium, in particular to a nanofluid heat transfer or cooling working medium. Background technique [0002] With the rapid development of science and technology and the increasingly prominent energy problems, the heat transfer load and heat transfer intensity of the heat exchange system are increasing day by day. The requirements for performance indicators such as compact resistance are getting higher and higher, and new and higher requirements are put forward for enhanced heat transfer technology, such as thermal control of spacecraft, cooling of high-temperature superconductors, thermal control in thin film deposition, and strong laser mirrors. Cooling and heat dissipation of high-power electronic components, etc. Therefore, there is an urgent need to develop high-efficiency and compact heat exchange equipment with small size, light weight, and good heat transfer performance to meet the req...

Claims

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Application Information

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IPC IPC(8): C09K5/10
Inventor 李新芳赵素芬张莉琼刘晓艳涂志刚朱冬生
Owner ZHONGSHAN FLASHLIGHT POLYTECHNIC
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