Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of graphene-based modified nanofluid heat transfer working medium and preparation method thereof

A technology of nanofluid and heat transfer working fluid, which is applied in the field of heat transfer, can solve the problems of narrow working temperature range and poor heat transfer capacity, and achieve the effect of simple and easy operation, easy process control and reduced viscosity in the preparation process

Active Publication Date: 2020-01-21
CHINA UNIV OF MINING & TECH
View PDF14 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of graphene-based modified nanofluid heat transfer medium, which solves the problems of poor heat transfer capacity and narrow working temperature range of traditional liquid heat transfer media

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of graphene-based modified nanofluid heat transfer working medium and preparation method thereof
  • A kind of graphene-based modified nanofluid heat transfer working medium and preparation method thereof
  • A kind of graphene-based modified nanofluid heat transfer working medium and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: Prepare nanofluid with glycerol, acetone, graphene as raw material.

[0029] Graphite, phosphorus pentoxide, potassium permanganate, and concentrated sulfuric acid are put into a reactor equipped with a magnetic stirrer, wherein the mass ratio of phosphorus pentoxide to potassium permanganate is 1:1, and graphite to phosphorus pentoxide 1. The mass ratio of the total mass of potassium permanganate is 2:1, and the mass ratio of graphite and concentrated sulfuric acid is 4:1. After the above materials are mixed, they are reacted at 30° C. for 6 hours, filtered after the reaction, and deionized water and Washed with absolute ethanol, and then dried in a vacuum oven at 50°C for 18 hours to obtain pre-oxidized graphite.

[0030] Put preoxidized graphite, potassium permanganate, and concentrated sulfuric acid into a reactor equipped with a magnetic stirrer, wherein the mass ratio of preoxidized graphite to potassium permanganate is 1:4, and the mass ratio of pre...

Embodiment 2

[0038] Embodiment 2: Prepare nanofluid with glycerol, acetone, graphene as raw material.

[0039] The preparation process of graphene is the same as embodiment 1.

[0040]Put 12.5g (0.136mol) of glycerol, 31.6g (0.544mol) of acetone, and 54mg of graphene into a reactor equipped with a magnetic stirrer, mix the above materials and react at 120°C for 12 hours, and depressurize after the reaction Unreacted acetone was distilled off, followed by ultrasonication in a 50KW ultrasonic cell pulverizer for 4 hours to obtain acetone glyceride: graphene nanofluid.

[0041]

[0042] After testing, the nanofluid has the following properties: viscosity: 20.9mPa·s (25°C), thermal conductivity: 0.2442W / (m·K) (32°C), temperature working range: -18~298°C.

Embodiment 3

[0043] Embodiment 3: Prepare nanofluid with glycerol, acetone, graphene as raw material.

[0044] The preparation process of graphene is the same as embodiment 1.

[0045] Put 12.5g (0.136mol) of glycerol, 39.4g (0.679mol) of acetone, and 27mg of graphene into a reactor equipped with a magnetic stirrer, mix the above materials and react at 120°C for 12 hours, and depressurize after the reaction Unreacted acetone was distilled off, followed by ultrasonication for 1 hour in a 50KW ultrasonic cell pulverizer to obtain acetone glyceride: graphene nanofluid.

[0046]

[0047] After testing, the nanofluid has the following properties: viscosity: 20.2mPa·s (25°C), thermal conductivity: 0.2278W / (m·K) (32°C), temperature working range: -18~298°C.

[0048] From Figure 5 It can be seen that the thermal conductivity of the graphene nanofluids prepared in Examples 1-3 has been significantly improved, wherein the thermal conductivity of 0.6% graphene nanofluids can reach 92%, and that...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
viscosityaaaaaaaaaa
viscosityaaaaaaaaaa
viscosityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a graphene-based modified nanofluid heat transfer fluid and a preparation method thereof. Firstly graphene oxide is prepared through twice oxidation, then graphene is obtainedafter reduction, the graphene, glycerin, ketone or aldehyde are mixed and then react at 80-150 DEG C for 2-12 hours, after the reaction is completed, reduced pressure distillation is carried out to remove the unreacted ketone or aldehyde, then the obtained turbid liquid is put into an ultrasonic cell pulverizer to be treated with ultrasound for 1-5 hours to obtain modified graphene: ketone / aldolase glycerol nanofluid. The graphene-based modified nanofluid heat transfer fluid and the preparation method thereof have the advantages that a traditional 'two-step' nanofluid preparation method is skillfully combined with organic synthetic chemical reaction, the preparation process is simple, the operation is easy; the prepared nanofluid has the advantages that on the basis of a base liquid, the thermal conductivity coefficient is increased by 92%, the viscosity is reduced by 98%, and the working temperature range is extended to 18-300 DEG C; the preparation process is simple, the material source is wide, the process is easy to control, the repeatability is good, and the technology is easy to popularize and apply.

Description

technical field [0001] The invention belongs to the technical field of heat transfer, and relates to a nanofluid heat transfer working substance, in particular to a graphene-based modified nanofluid heat transfer working substance and a preparation method thereof. Background technique [0002] The heat transfer process involves all walks of life in industry. With the increasing heat load of the heat transfer system and the complexity of the structure of the heat transfer system, higher requirements are placed on the heat transfer technology, such as thermal insulation superconductor cooling, thermal control in thin film deposition, thermal management of power batteries, large Heat dissipation of power electronic components and thermal management of aerospace vehicles, etc. Improving the performance of heat transfer medium is one of the main ways to enhance heat transfer. [0003] In 1995, Professor Choi of the Argonne Laboratory in the United States proposed the concept of...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/14
CPCC09K5/14
Inventor 刘昌会饶中浩刘臣臻赵佳腾霍宇涛
Owner CHINA UNIV OF MINING & TECH