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<p>Presented, a study on the heat transfer performance and pressure loss of bio-based functionalized multi-walled nanocarbon tubes nanofluid (C-MWCNT) dispersed in distilled water through circular backward-facing step passage under constant heat flux. The experiment encompasses the evaluation of thermos-physical properties of this environment-friendly working nanofluids in a circular backward-facing step flow passage. The carbon nanotubes particles were functionalized using the clove-extract functional group and then dispersed to make nanofluid samples of different mass concentrations. Clove extracts contain eugenol, phenolic acid, and gallic acid, which act as effective reactants. Heat transfer performance result showed that the C-MWCNT nanofluids showed higher thermal conductivity than those of pure water. The heat transfer coefficient of the nanofluid through the backward-facing step flow passage increased with the increase of concentration of the nanoparticles. The observed enhancement of heat transfer coefficient of the C-MWCNT found to be 2.7, 6.5, 8.3 and 9.3% for the concentrations 0.025, 0.05, 0.075 and 0.1mass%, respectively. However, there is an inversely proportional relationship between the Nusselt number and the concentration of nanoparticles. The maximum heat transfer coefficient occurred at the reattachment point of the nanofluid to the flow passage surface after the separation.</p>

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Investigation of heat transfer and pressure loss of bio-based functionalized multi-walled carbon nanotubes nanofluid in separation flow passage

  • 期刊论文

  • 发表日期：

    2025年1月23日

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  • Mohamad Jamal Abdullah,
  • Mahar Diana Hamid,
  • Kazi Salim Newaz

摘要

Presented, a study on the heat transfer performance and pressure loss of bio-based functionalized multi-walled nanocarbon tubes nanofluid (C-MWCNT) dispersed in distilled water through circular backward-facing step passage under constant heat flux. The experiment encompasses the evaluation of thermos-physical properties of this environment-friendly working nanofluids in a circular backward-facing step flow passage. The carbon nanotubes particles were functionalized using the clove-extract functional group and then dispersed to make nanofluid samples of different mass concentrations. Clove extracts contain eugenol, phenolic acid, and gallic acid, which act as effective reactants. Heat transfer performance result showed that the C-MWCNT nanofluids showed higher thermal conductivity than those of pure water. The heat transfer coefficient of the nanofluid through the backward-facing step flow passage increased with the increase of concentration of the nanoparticles. The observed enhancement of heat transfer coefficient of the C-MWCNT found to be 2.7, 6.5, 8.3 and 9.3% for the concentrations 0.025, 0.05, 0.075 and 0.1mass%, respectively. However, there is an inversely proportional relationship between the Nusselt number and the concentration of nanoparticles. The maximum heat transfer coefficient occurred at the reattachment point of the nanofluid to the flow passage surface after the separation.