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<p>This biorefinery approach study investigates the possibility of the used cooking oil methyl ester (UCOME)-based nanofluids enhanced with multi-walled carbon nanotubes (MWCNT) for transformer oil applications, focusing on improving the key properties concerning electrical insulation and thermal management. For sustainability, a biorefinery-derived product called UCOME was used as the base fluid; however, its properties were enhanced using MWCNTs. Nanofluids containing different concentrations of MWCNTs (0.02%, 0.05%, and 0.10%) dispersed within UCOME using ultrasonic dispersion were prepared. The AC breakdown voltage (AC BDV) of UCOME was improved extensively by the addition of MWCNTs. There was an improvement in electrical insulating capability as obtained from the highest BDV in UCOME + 0.05% MWCNT. The resistivity of UCOME decreased with the addition of MWCNTs and the dielectric constant increased at all temperatures. The electrical conductivity increased with the temperature, whereas the viscosity increased with the concentration of MWCNT, peaking at 4.98 cSt for 0.02% MWCNT. The thermal properties, including the thermal conductivity and diffusivity, were also improved by the addition of MWCNTs. These results indicate that MWCNT-enhanced UCOME is a promising alternative to transformer oil, which is expected to provide better electrical and thermal properties for optimal performance in transformer systems.</p>

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A biorefinery approach for multi-walled carbon nanotube enhanced used cooking oil methyl ester nanofluids in improved transformer insulation

  • 期刊论文

  • 发表日期：

    2025年7月21日

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  • T. Sudhakar,
  • R. Muniraj,
  • Y. Mary Reeja,
  • T. Jarin

摘要

This biorefinery approach study investigates the possibility of the used cooking oil methyl ester (UCOME)-based nanofluids enhanced with multi-walled carbon nanotubes (MWCNT) for transformer oil applications, focusing on improving the key properties concerning electrical insulation and thermal management. For sustainability, a biorefinery-derived product called UCOME was used as the base fluid; however, its properties were enhanced using MWCNTs. Nanofluids containing different concentrations of MWCNTs (0.02%, 0.05%, and 0.10%) dispersed within UCOME using ultrasonic dispersion were prepared. The AC breakdown voltage (AC BDV) of UCOME was improved extensively by the addition of MWCNTs. There was an improvement in electrical insulating capability as obtained from the highest BDV in UCOME + 0.05% MWCNT. The resistivity of UCOME decreased with the addition of MWCNTs and the dielectric constant increased at all temperatures. The electrical conductivity increased with the temperature, whereas the viscosity increased with the concentration of MWCNT, peaking at 4.98 cSt for 0.02% MWCNT. The thermal properties, including the thermal conductivity and diffusivity, were also improved by the addition of MWCNTs. These results indicate that MWCNT-enhanced UCOME is a promising alternative to transformer oil, which is expected to provide better electrical and thermal properties for optimal performance in transformer systems.