Method for enhancing heat transfer performance of nano suspension

A technology of nano-suspension and heat transfer performance, applied in the field of strengthening heat transfer, can solve the problems of weakened heat transfer performance of nano-suspension, unstable and lasting thermal properties, poor dispersion stability, etc., and achieves a narrow particle size distribution range. , low cost, and the effect of improving heat transfer performance indicators

Inactive Publication Date: 2021-12-07
GUANGDONG UNIV OF TECH
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings and deficiencies of nano-suspension existing in the prior art due to poor dispersion stability, resulting in unstable thermal properties and weakening heat transfer performance of nano-suspension, the purpose of the present invention is to provide a strengthened nano-suspension Liquid Heat Transfer Properties Methods

Method used

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  • Method for enhancing heat transfer performance of nano suspension

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) 5g sodium dodecylbenzenesulfonate SDBS surfactant and 15gCuO nanoparticles are added to 980g deionized water, then the sample is placed in a constant temperature magnetic stirrer, and the magnetic stirring speed of 500rpm is set for magnetic stirring Stir, and magnetically stir for 30 minutes to make a mixed solution;

[0025] (2) Put the mixed solution into an ultrasonic cleaner for ultrasonic dispersion for 2 hours, and the ultrasonic frequency is 40kHz to obtain sodium dodecylbenzenesulfonate SDBS surfactant with a mass concentration of 0.5% and CuO nanoparticles with a mass concentration of 1.5%. % CuO nanoparticles suspension.

[0026] (3) Pour the prepared CuO nano-suspension into the experimental system, turn on the system for flow heat transfer cycle, adjust the fluid flow rate, record the experimental data and comprehensively analyze the flow and heat transfer characteristics of the nano-suspension. When the Reynolds number reached 3070, the comprehensive ...

Embodiment 2

[0028] (1) 10g polyvinylpyrrolidone PVP surfactant and 10gSiO 2 Nanoparticles were added to 980g deionized water, then the sample was placed in a constant temperature magnetic stirrer, 500rpm magnetic stirring speed was set to carry out magnetic stirring, and magnetic stirring was made into a mixed solution for 30 minutes;

[0029] (2) Put the mixed solution into an ultrasonic cleaner for ultrasonic dispersion for 2 hours, and the ultrasonic frequency is 40kHz to obtain polyvinylpyrrolidone PVP surfactant with a mass concentration of 1.0%, SiO 2 Nanoparticle mass concentration of 1.0% SiO 2 Nanoparticle suspension.

[0030] (3) The prepared SiO 2The nano-suspension is poured into the experimental system, the experimental system is turned on for flow heat transfer cycle, the fluid flow rate is adjusted, the experimental data is recorded and the flow and heat transfer characteristics of the nano-suspension are comprehensively analyzed. When the Reynolds number reached 3045, t...

Embodiment 3

[0032] (1) 15g cetyltrimethylammonium bromide CTAB surfactant and 20g SiC nanoparticles are added to 965g deionized water, then the sample is placed in a constant temperature magnetic stirrer, and 500rpm magnetic stirrer speed is set for Magnetic stirring, magnetic stirring was made mixed solution for 30 minutes;

[0033] (2) Put the mixed solution into an ultrasonic cleaner for ultrasonic dispersion for 2 hours, and the ultrasonic frequency is 40kHz to obtain cetyltrimethylammonium bromide CTAB surfactant mass concentration of 1.0%, SiC nanoparticle mass concentration 1.0% SiC nanoparticle suspension.

[0034] (3) Pour the prepared SiC nano-suspension into the experimental system, turn on the experimental system for flow heat transfer cycle, adjust the fluid flow rate, record the experimental data and comprehensively analyze the flow and heat transfer characteristics of the nano-suspension. When the Reynolds number reaches 3055, the comprehensive flow and heat transfer perfo...

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Abstract

The invention belongs to the field of enhanced heat transfer, and discloses a method for enhancing the heat transfer performance of a nano suspension. The invention aims to solve the technical problem that the heat transfer performance of the nano suspension is weakened due to unstable and lasting thermophysical performance caused by poor dispersion stability of the nano suspension. According to the properties of nanoparticles and nanocapsules, the type and the concentration of the surfactant are reasonably regulated and controlled, the nano-suspension which is uniformly dispersed and has excellent thermophysical properties is prepared by adopting a two-step method, the nano-suspension is applied to in-tube flow heat transfer, the flow and heat transfer characteristics of the nano-suspension are comprehensively analyzed, and the enhanced heat transfer degree is judged. The method can be applied to experimental pipelines with the pipe diameter range of 0.5-2 cm and the Reynolds number range of 3000-10000. According to the method, the application range of the nano-suspension is widened, and a basis is provided for practical application of the nano-fluid.

Description

technical field [0001] The invention belongs to the field of heat transfer enhancement, in particular to a method for enhancing the heat transfer performance of a nano suspension. Background technique [0002] Energy is the material basis of human activities. The development of human society is inseparable from the use of energy and its technology. Its development is a common concern of the whole world and all mankind. With the rapid development of modern society, the demand for energy is increasing, and the energy problems brought about are becoming more and more prominent. The utilization of energy will inevitably lead to the loss of energy. Energy utilization efficiency refers to the degree to which the energy contained in energy is effectively utilized, and is an important indicator of sustainable energy development. In the "2013 Global Energy Industry Efficiency Research" report, my country's energy utilization efficiency ranks 74th, with an energy utilization efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K5/10C09K5/08
CPCC09K5/10C09K5/08
Inventor 贾莉斯覃光军陈颖莫松平李俊王慧昌钟凯
Owner GUANGDONG UNIV OF TECH
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