The effect of nanoparticles on laminar heat transfer in a horizontal tube

Research output: Contribution to journalArticlepeer-review


  • Ehsan B. Haghighi
  • Ashkan I.T. Zavareh
  • Morteza Ghanbarpourgeravi
  • Heiko Poth
  • Rahmatollah Khodabandeh
  • Björn Palm

Colleges, School and Institutes


Abstract Heat transfer coefficient in laminar flow of water-based alumina, titania and carbon nanotube nanofluids in a straight pipe with constant heat flux at the wall have been investigated independently by two universities. The nanoparticles affect the thermo-physical properties of the suspensions, however, nanoparticles presence and movement due to Brownian diffusion and thermophoresis seemed to have insignificant effect on heat transfer coefficient. The Nusselt number of all investigated nanofluids followed standard heat transfer correlations developed for liquids within ±10% suggesting that all investigated nanofluids can be treated as homogenous fluids. Different methods of comparison between heat transfer coefficient in nanofluids and base fluid are also critically discussed.


Original languageEnglish
Pages (from-to)77-91
Number of pages15
JournalInternational Journal of Heat and Mass Transfer
Early online date29 Oct 2013
Publication statusPublished - 1 Feb 2014


  • Heat transfer coefficient, Keywords, Laminar flow, Nanofluid