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Preparation method of carbon nano tube drag-reduction nano fluid

A technology of carbon nanotubes and nanofluids, applied in the direction of mixing methods, chemical instruments and methods, heat exchange equipment, etc., can solve the problems of reducing fluid transport resistance, increasing fluid flow resistance, reducing fluid heat exchange capacity, etc., to achieve Effects of reducing pump work, reducing flow resistance, and enhancing heat transfer characteristics

Inactive Publication Date: 2010-04-14
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surfactant drag-reducing fluid greatly reduces the heat exchange capacity of the fluid while reducing the fluid transport resistance, which is one of the biggest disadvantages of the surfactant drag-reducing fluid
Nanofluids can improve the heat transfer capacity of the fluid to a certain extent, but also slightly increase the flow resistance of the fluid.

Method used

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  • Preparation method of carbon nano tube drag-reduction nano fluid
  • Preparation method of carbon nano tube drag-reduction nano fluid
  • Preparation method of carbon nano tube drag-reduction nano fluid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 100g of CNT powder was immersed in 20% NaOH solution, and submerged by NaOH solution, placed in an ultrasonic oscillator, and ultrasonically oscillated at 50°C for 5 hours. The operating frequency of the ultrasonic oscillator is 25kHz.

[0022] The liquid was filtered to obtain a CNT solid, which was washed repeatedly with deionized water.

[0023] The cleaned CNTs were obtained and dried in an electric furnace at a temperature of 120°C.

[0024] 2g of CTAC powder was added into 20kg of deionized water, and then the dried CNT powder was collected and added to the CTAC solution to prepare a mixed solution.

[0025] The obtained mixed solution was placed in an ultrasonic oscillator and oscillated for 10 hours at room temperature, and the working frequency of the ultrasonic oscillator was 25 kHz. The mixed solution after shaking is collected to obtain a carbon nanotube drag-reducing nanofluid with a mass concentration of CTAC of 0.01% and a mass concentration o...

Embodiment 2

[0027] 400g of CNT powder was immersed in 20% NaOH solution and submerged by NaOH solution, put into an ultrasonic oscillator, and ultrasonically oscillated at 50°C for 5 hours. The operating frequency of the ultrasonic oscillator is 30kHz.

[0028] The liquid was filtered to obtain a CNT solid, which was washed repeatedly with deionized water.

[0029] The cleaned CNTs were obtained and dried in an electric furnace at a temperature of 120°C.

[0030] 8g of CTAC powder was added into 20kg of deionized water, and then the dried CNT powder was collected and added to the CTAC solution to prepare a mixed solution.

[0031] The obtained mixed solution was placed in an ultrasonic oscillator and oscillated at room temperature for 10 hours, and the working frequency of the ultrasonic oscillator was 30 kHz. By collecting the mixed solution after shaking, a carbon nanotube drag-reducing nanofluid with a mass concentration of CTAC of 0.04% and a mass concentration of CNT of 2...

Embodiment 3

[0033] 800g of CNT powder was immersed in 20% NaOH solution and submerged by NaOH solution, put into an ultrasonic oscillator, and ultrasonically oscillated at 50°C for 5 hours. The operating frequency of the ultrasonic oscillator is 40kHz.

[0034] The liquid was filtered to obtain a CNT solid, which was washed repeatedly with deionized water.

[0035] The cleaned CNTs were obtained and dried in an electric furnace at a temperature of 120°C.

[0036] 6g of CTAC powder was added to 20kg of deionized water, and then the dried CNT powder was collected and added to the CTAC solution to prepare a mixed solution.

[0037] The obtained mixed solution was put into an ultrasonic oscillator and oscillated for 10 hours at room temperature, and the working frequency of the ultrasonic oscillator was 40 kHz. By collecting the mixed solution after shaking, a carbon nanotube drag-reducing nanofluid with a mass concentration of CTAC of 0.03% and a mass concentration of CNT of 4% c...

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Abstract

The invention relates to a preparation method of a carbon nano-tube anti-drag nanometer fluid, which takes deionized water as a base fluid, and adds a surfactant Cetyltrimethyl Ammonium Chloride (CTAC) and nano-scale carbon nano-tube (CNT) solid particles. The method comprises: soaking the CNT into lye for ultrasonic oscillating treatment, cleaning and drying the obtained CNT powder after filtration and then adding the powder into the deionized water, meanwhile adding the CTAC in fixed proportion, then implementing the ultrasonic oscillations for 10 to 14 hours, and finally preparing the carbon nano-tube anti-drag nanometer fluid. The applicable pipe diameter scope of the method is from 1 to 40cm, and the range of Reynolds number is between 4000 and 100000. The effective concentration scope of the CTAC is selected according to different operating conditions (pipe diameter and Reynolds number). The mixture ratio of the additive directly influences the flow and heat transfer performanceof the carbon nano-tube anti-drag nanometer fluid. The carbon nano-tube anti-drag nanometer fluid has the feature of reducing the flow resistance of the anti-drag fluid in the transport process, and also has the characteristic of heat exchange enhancement of the nano-fluid.

Description

technical field [0001] The invention relates to a preparation method of a carbon nanotube drag-reducing nanofluid, belonging to the technical fields of liquid transportation and heat exchange. Background technique [0002] The urgent need for energy saving is the driving force for drag-reduction research. For a long time, in all fields involving viscous fluid motion, from internal flow to external flow, people have been looking for ways to reduce fluid resistance. The viscous drag reduction method is a technology that relies on changing the physical and mechanical properties of the boundary material or adding drag reducing additives to the flow boundary layer to change the kinematics and dynamics of the boundary layer flow, thereby achieving the purpose of drag reduction. Adding a small amount of additives (such as sand, fibers, polymers, surfactants, etc.) to the fluid can reduce the fluid flow resistance in a turbulent state. This method is called additive drag reduction....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01F3/12B01F11/02C09K5/10F28F23/00
Inventor 刘振华廖亮杨雪飞陆琳
Owner SHANGHAI JIAOTONG UNIV