EFFECT OF TEMPERATURE ON HEAT TRANSFER COEFFICIENT OF TITANIUM DIOXIDE IN ETHYLENE GLYCOL-BASED NANOFLUID

K.  Abdul Hamid; W.H.  Azmi; Rizalman  Mamat; N.A.  Usri; G. Najafi

doi:10.15282/jmes.8.2015.11.0133

Authors

K. Abdul Hamid Faculty of Mechanical Engineering, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia
W.H. Azmi Faculty of Mechanical Engineering, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia
Rizalman Mamat Faculty of Mechanical Engineering, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia
N.A. Usri Faculty of Mechanical Engineering, Universiti Malaysia Pahang, 26600 Pekan, Pahang, Malaysia
G. Najafi Biosystems Engineering Department, Tarbiat Modares University, P.O. Box 14115-111, Tehran 14114, Iran

DOI:

https://doi.org/10.15282/jmes.8.2015.11.0133

Keywords:

heat transfer coefficient; nanofluid; titanium dioxide; ethylene glycol

Abstract

Nanofluid as a coolant has potential for use in the heat transfer field because of its augmentation in thermal properties that offers advantages in heat transfer. Research on various working temperatures is still ongoing in the nanofluid field. This study focused on the effect of temperature on heat transfer behavior using titanium dioxide or TiO2 nanofluid as the working fluid in forced convection. The heat transfer coefficient was determined for flow in a circular tube under constant heat flux boundary conditions. The experiment was conducted with a Reynolds number less than 25000 with concentrations of TiO2 nanofluid at 0.5%, 1.0% and 1.5%. At 30oC, the maximum enhancement of 9.72% for 1.5% volume concentration was observed. Enhancements of 22.75% and 28.92% were found at 50oC and 70oC, respectively under similar nanofluid concentrations. The nanofluid performance was significantly influenced by working temperature. The heat transfer enhancement of TiO2 nanofluid was considerably improved at higher working temperature and high concentration because of the improvement of thermal properties.

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