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A method for preparing carbon nanofluid

a carbon nanotube and fluid technology, applied in the field of carbon nanotube preparation, can solve the problems of low thermal conductivity, difficult to evenly disperse carbon nanotubes into fluids, and strong and flexible carbon nanotubes

Inactive Publication Date: 2007-11-01
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007] In a further another example, the present invention provides a carbon nanofluid capable of serving as a heat transfer fluid. The carbon nanofluid comprises about 99.8 to about 98% by volume of a base fluid and from about 0.2...

Problems solved by technology

Low thermal conductivity is a primary limitation in the development of energy-efficient heat transfer fluids required in many industrial applications.
However, carbon nanotubes are strong and flexible, yet very cohesive.
This makes it difficult to evenly-disperse them into fluids for providing an efficient heat transfer agent in the energy management.

Method used

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  • A method for preparing carbon nanofluid
  • A method for preparing carbon nanofluid

Examples

Experimental program
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Effect test

example 1

Nanofluid A (Carbon Nanotubes / Ethylene Glycol)

[0035] The nanofluid A was prepared by dispersing multiple walled carbon nanotubes in ethylene glycol. No surfactant was added to the nanofluid A. And the carbon nanotubes were combined with and dispersed in ethylene glycol through an ultrasonication operation at 600 W for approximately one hour. During the ultrasonication operation, a cooling operation was applied using a dual tube heat exchanger as shown in FIG. 2 for cooling the nanofluid A during the ultrasonication operation performed by an ultrasonic homogenizer.

[0036] Next, the nanofluid A was subjected to thermal conductivity measurement as described above. As listed in Table 1 below, the thermal conductivity (represented by k value) was increased by 12.4% at a volume fraction of 0.01 (1 vol. %) for the carbon nanotubes / ethylene glycol suspensions as compared with ethylene glycol only. Therefore, small amount of carbon nanotubes dispersed according to the present invention resu...

example 2

Nanofluid B (Carbon Nanotubes / Water)

[0037] The nanofluid B was prepared by dispersing multiple walled carbon nanotubes in the water. No surfactant was added to the nanofluid B. And the carbon nanotubes were combined with and dispersed in the water through an ultrasonication operation at 600 W for approximately one hour. During the ultrasonication operation, a cooling operation was applied using a dual tube heat exchanger as shown in FIG. 2 for cooling the nanofluid B during the ultrasonication operation performed by an ultrasonic homogenizer.

[0038] Next, the nanofluid B was subjected to thermal conductivity measurement as described above. As listed in Table 2 below, the thermal conductivity was increased by 17.8% at a volume fraction of 0.015 (1.5 vol. %) for the carbon nanotubes / water suspensions as compared with water only. Therefore, small amount of carbon nanotubes dispersed according to the present invention resulted in a significant increase in the thermal conductivity of th...

example 3

Nanofluid C (Carbon Nanotubes / Synthetic Engine Oil)

[0039] The nanofluid C was prepared by dispersing multiple walled carbon nanotubes in the synthetic engine oil. N-hydroxysuccinimide (NHS) was added to the nanofluid C. And the carbon nanotubes were combined with and dispersed in the synthetic engine oil through an ultrasonication operation at 600 W for approximately one hour. During the ultrasonication operation, a cooling operation was applied using a dual tube heat exchanger as shown in FIG. 2 for cooling the nanofluid C during the ultrasonication operation performed by an ultrasonic homogenizer.

[0040] Next, the nanofluid C was subjected to thermal conductivity measurement as described above. As listed in Table 3 below, the thermal conductivity was increased by 30.3% at a volume fraction of 0.02 (2.0 vol. %) for the carbon nanotubes / synthetic engine oil suspensions as compared with oil only. Therefore, small amount of carbon nanotubes dispersed according to the present inventio...

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Abstract

The present invention provides a method for preparing a carbon nanofluid. The method includes providing a base fluid, providing a number of carbon nanotubes, combining the carbon nanotubes with the base fluid, dispersing the carbon nanotubes substantially evenly in the base fluid through a physical agitation operation, and cooling a system performing the physical agitation operation during the physical agitation operation. The present invention also provides a carbon nanofluid capable of serving as a heat transfer fluid. The carbon nanofluid includes about 99.8 to about 98% by volume of a base fluid, and from about 0.2 to about 2.0% by volume of functionalized carbon nanotubes substantially evenly-dispersed in the base fluid.

Description

BACKGROUND OF THE INVENTION [0001] The present invention relates to a carbon nanotechnology, more particularly to a method for preparing carbon nanofluid with enhanced thermal conductivity. [0002] The thermal conductivity of heat transfer fluid plays an important role in the development of energy-efficient heat transfer equipment including electronics, heating, ventilating, air-conditioning, refrigeration, and transportation. Development of advanced heat transfer fluids is clearly essential to improve the effective heat transfer behavior of conventional heat transfer fluids. Low thermal conductivity is a primary limitation in the development of energy-efficient heat transfer fluids required in many industrial applications. [0003] U.S. Pat. No 5,863,455 to Segal disclosed a colloidal fluid having metallic particles in a carrier fluid to insulate and cool an electromagnetic device which generates heat as a result of utilizing high current densities and high alternative current (AC) vo...

Claims

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Application Information

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IPC IPC(8): D01F9/12
CPCB82Y30/00B82Y40/00C01B31/0253C01B31/0273C01B2202/02F28F13/00C01B2202/06C01B2202/28C09K5/10F28D1/06C01B2202/04C01B32/168C01B32/174
Inventor LIU, MIN-SHENGLIN, CHING-CHENG
Owner IND TECH RES INST
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