Abstract
In this paper, the results of the experimental investigation on the thermal properties of Nano fluid are presented. The effect of sonication time, settling time and temperature on the thermal conductivity, viscosity and specific heat of zinc oxide (ZnO, 14 nm and 25 nm size) and single walled carbon nanotube (SWCNT, 10nm size) based Nano fluid are investigated and the results of ZnO with DI water and ethylene glycol (EG) as base fluids are compared. The experimental results indicate that the studied parameters have a remarkable effect on the thermal properties of Nano fluid. The rate of enhancement in thermal conductivity of EG based Nano fluid is found to be less than that of water based Nano fluid. The SWCNT based DI water Nano fluid found to be very unstable i.e. the nanoparticles settle down very rapidly. The 0.02% volume fraction of SWCNT nanoparticles suspension results in 10% increase in the specific heat of DI water. A decrement of 24% and 13% in the specific heat of 14 nm size ZnO based Nano fluid were obtained at a volume fraction of 0.001% and 0.002% respectively.
Highlights
Nano fluid came into picture in the field of heat transfer in systems since it was introduced by Choi [1]
Calvin [12] investigated effect of volume fraction and temperature on the CuO and Al2O3 nanoparticles based water Nano fluid and the results showed an increase of 52% in the thermal conductivity of DI water, when CuO nanoparticles were dispersed at a volume fraction of 6% [13]
Jang [14] investigated the effect of temperature and volume fraction on the viscosity Al2O3 nanoparticles dispersed in water, the results reported an increase of 2.9% in the viscosity of base fluid at a volume fraction of 0.3% and with the increase in temperature the viscosity of Nano fluid decreases continuously [15,16]
Summary
Nano fluid came into picture in the field of heat transfer in systems since it was introduced by Choi [1]. Calvin [12] investigated effect of volume fraction and temperature on the CuO and Al2O3 nanoparticles based water Nano fluid and the results showed an increase of 52% in the thermal conductivity of DI water, when CuO nanoparticles were dispersed at a volume fraction of 6% [13]. Jang [14] investigated the effect of temperature and volume fraction on the viscosity Al2O3 nanoparticles dispersed in water, the results reported an increase of 2.9% in the viscosity of base fluid at a volume fraction of 0.3% and with the increase in temperature the viscosity of Nano fluid decreases continuously [15,16]. The effect of volume fraction, sonication time, settling time, diameter of particles and temperature on the thermal properties of zinc oxide and single walled carbon nanotube based Nano fluid s is presented
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