Volume No. 7 Issue No.: 2 Page No.: 768-777 Oct. - Dec. 2012

 

Review Paper (T) INVESTIGATION OF THERMAL CONDUCTIVITY AND VISCOSITY OF NANOFLUIDS

 

Tiwari Arun Kumar *, Ghosh Pradyumna and Sarkar Jahar

Department of Mechanical Engineering, Indian Institute of Technology (BHU), Varanasi

 

Received on : July 10, 2012

 

ABSTRACT

 

A colloidal mixture of nano-sized (<100 nm) particles in a base liquid called nanofluid, which is the new generation of heat transfer fluid for various heat transfer applications where transport characteristics are substantially higher than the base liquid. This review summarizes and analyzes the empirical correlations for the effective thermal conductivity and dynamic viscosity of the nanofluid based on experimental data and theoretical model available in the literature. The review shows that the thermal conductivity ratio of the nanofluid to the base liquid for spherical and cylindrical nanoparticles increase appreciably with the increase of nanoparticle concentration and temperature. In addition, the viscosity ratio of the nanofluid to the base liquid also increase with the increase of nanoparticle concentration. This paper also surveys the mathematical models for estimation of thermal conductivity and viscosity of nanofluids and their limitations.

 

Keywords : Nanofluids, Thermal conductivity, Viscosity, Experimental,Model

 

 

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