Heat dissipation performance of MWCNTs nano-coolant for vehicle

Tun-Ping Teng, Chao Chieh Yu

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

This study demonstrates the heat dissipation performance of a motorcycle radiator filled with multi-walled carbon nanotubes (MWCNTs) nano-coolant (NC). The two-step synthesis method was used to produce different concentrations of MWCNTs/water (W) nanofluid (0.1, 0.2, and 0.4wt.%) using a 0.4wt.% cationic chitosan dispersant, and the MWCNTs/W nanofluid was mixed with ethylene glycol (EG) at a 1:1 volume ratio to form the NC1, NC2, and NC3. The experiments in this study measured the thermal conductivity, viscosity and specific heat of NC with weight fractions and sample temperatures (80, 85, 90, and 95°C), and then used the NC in an air-cooled radiator for a motorcycle to assess its heat exchange capacity, Nusselt number and pumping power under different volumetric flow rates (4.5, 6.5, and 8.5L/min) and sample temperatures (80, 85, 90, and 95°C). Considering the overall efficiency of the heat exchange system, this study evaluates the relationship of heat exchange capacity and the pumping power using the efficiency factor (EF). Experimental results show that the NC1 has a higher heat exchange capacity and EF than EG/W. The maximum enhanced ratios of heat exchange, pumping power, and EF for all the experimental parameters in this study were approximately 12.8%, 4.9%, and 14.1%, respectively, compared with EG/W. NC with high concentrations of MWCNTs cannot achieve a better heat exchange capacity because the uneven density of NC in the flow state increases the thermal resistance of the solid-liquid interface, effectively decreasing the contact area between the MWCNTs and the EG/W.

Original languageEnglish
Pages (from-to)22-30
Number of pages9
JournalExperimental Thermal and Fluid Science
Volume49
DOIs
Publication statusPublished - 2013 Sep 1

Fingerprint

Carbon Nanotubes
Heat losses
Coolants
Carbon nanotubes
Ethylene Glycol
Ethylene glycol
Motorcycles
Radiators
Chitosan
Nusselt number
Heat resistance
Contacts (fluid mechanics)
Specific heat
Hot Temperature
Thermal conductivity
Flow rate
Viscosity
Temperature
Water
Liquids

Keywords

  • Efficiency factor (EF)
  • Heat exchange capacity
  • Multi-walled carbon nanotubes (MWCNTs)
  • Nano-coolant
  • Pumping power

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Mechanical Engineering
  • Chemical Engineering(all)
  • Aerospace Engineering
  • Nuclear Energy and Engineering

Cite this

Heat dissipation performance of MWCNTs nano-coolant for vehicle. / Teng, Tun-Ping; Yu, Chao Chieh.

In: Experimental Thermal and Fluid Science, Vol. 49, 01.09.2013, p. 22-30.

Research output: Contribution to journalArticle

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abstract = "This study demonstrates the heat dissipation performance of a motorcycle radiator filled with multi-walled carbon nanotubes (MWCNTs) nano-coolant (NC). The two-step synthesis method was used to produce different concentrations of MWCNTs/water (W) nanofluid (0.1, 0.2, and 0.4wt.{\%}) using a 0.4wt.{\%} cationic chitosan dispersant, and the MWCNTs/W nanofluid was mixed with ethylene glycol (EG) at a 1:1 volume ratio to form the NC1, NC2, and NC3. The experiments in this study measured the thermal conductivity, viscosity and specific heat of NC with weight fractions and sample temperatures (80, 85, 90, and 95°C), and then used the NC in an air-cooled radiator for a motorcycle to assess its heat exchange capacity, Nusselt number and pumping power under different volumetric flow rates (4.5, 6.5, and 8.5L/min) and sample temperatures (80, 85, 90, and 95°C). Considering the overall efficiency of the heat exchange system, this study evaluates the relationship of heat exchange capacity and the pumping power using the efficiency factor (EF). Experimental results show that the NC1 has a higher heat exchange capacity and EF than EG/W. The maximum enhanced ratios of heat exchange, pumping power, and EF for all the experimental parameters in this study were approximately 12.8{\%}, 4.9{\%}, and 14.1{\%}, respectively, compared with EG/W. NC with high concentrations of MWCNTs cannot achieve a better heat exchange capacity because the uneven density of NC in the flow state increases the thermal resistance of the solid-liquid interface, effectively decreasing the contact area between the MWCNTs and the EG/W.",
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