Showing items 1 - 5 of 5

Thermal and hydrodynamic performance of a microchannel heat sink with carbon nanotubes nanofluids: Effect of concentration and channel section

- Patrice Estellé, Salma Halelfadl, Thierry Maré, Tng Choon Siong

Thermal and hydrodynamic performance of a microchannel heat sink cooled with carbon nanotubes nanofluid

- Thierry Mare, Patrice Estelle, Salma Halelfadl

  • Creator: Thierry Mare , Patrice Estelle , Salma Halelfadl
  • Date: 2016
  • Subjects: Mechanical engineering
  • Language: ENG
  • Type: Journal Article
  • Identifier: vital:106333 , ISSN 2180–3722 , valet-20180116-125530
  • Full Text: false
  • Description: The microchannel heat sink (MCHS) has been established as an effective heat removal system in electronic chip packaging. With increasing power demand, research has advanced beyond the conventional coolants of air and water towards nanofluids with their enhanced heat transfer capabilities. This research had been carried out on the optimization of the thermal and hydrodynamic performance of a rectangular microchannel heat sink (MCHS) cooled with carbon nanotube (CNT) nanofluid, a coolant that has recently been discovered with improved thermal conductivity. Unlike the common nanofluids with spherical particles, nanotubes generally come in cylindrical structure characterized with different aspect ratios. A volume concentration of 0.1% of the CNT nanofluid is used here; the nanotubes have an average diameter and length of 9.2 nm and 1.5 m respectively. The nanofluid has a density of 1800 kg/m3 with carbon purity 90% by weight having lignin as the surfactant. The approach used for the optimization process is based on the thermal resistance model and it is analyzed by using the non-dominated sorting multi-objective genetic algorithm. Optimized outcomes include the channel aspect ratio and the channel wall ratio at the optimal values of thermal resistance and pumping power. The optimized results show that, at high operating temperature of 40C the use of CNT nanofluid reduces the total thermal resistance by 3% compared to at 20C and consequently improve the thermal performance of the fluid. In terms of the hydrodynamic performance, the pumping power is also being reduced significantly by 35% at 40C compared to the lower operating temperature.

Optimization of thermal performances and pressure drop of rectangular microchannel heat sink using aqueous carbon nanotubes based nanofluid

- Salma Halelfadl, Ahmed Mohammed Adham, Normah Mohd. Ghazali, Maŕe, Thierry, Estellé, Patrice, Robiah Ahmad

Optimization of thermal performances and pressure drop of rectangular microchannel heat sink using aqueous carbon nanotubes based nanofluid

- Salma Halelfadl, Ahmed Mohammed Adham, Normah Mohd Ghazali, Mare, Thierry, Estelle, Patrice, Robiah Ahmad

Consideration of carbon nanotube-based nanofluid in thermal transfer

- Thierry Mare, Patrice Estelle, Salma Halelfadl

  • Creator: Thierry Mare , Patrice Estelle , Salma Halelfadl
  • Subjects: Mechanical engineering
  • Language: ENG
  • Type: Journal Article
  • Identifier: vital:105976 , ISSN 2180–3722 , valet-20180212-092128
  • Full Text: false
  • Description: In the current trend towards demand for effective heat removal of high density heat flux, research into nanofluids have escalated due to the rise in thermal conductivity associated with the coolants. Are nanofluids a solution for a better thermal management? Does the application of nanofluids as coolants have limitations? This article presents a review of the thermophysical properties of carbon nanotube-water nanofluids, in particular the desired properties of low viscosity and high thermal conductivity. The effects of the concentration, temperature, aspect ratio, and surfactant on the thermal conductivity and viscosity of carbon nanotube nanofluid have been studied experimentally. These effects are thendiscussed for evaluation of the applicability of carbon nanotube-based nanofluidas a coolant for heat removal purposes.
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