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Mehta et al., International Journal of Advanced Engineering Technology E-ISSN 0976-3945 1.5.2 Experimental results on thermal conductivity of Al2O3- based nano fluids Alumina (Al2O3) is the most commonly and widely used nano particle by many researchers during their experimental works. Efforts have been made to study the thermal conductivity of nano fluids. The effect of these experimental studies on the thermal conductivity of Al2O3-based nano fluids is given above in Table 1. Usually, thermal conductivity of the nano fluids increases with increasing fraction in volume of nano particles; with decreasing particle size, the shape of such particles can also influence the thermal conductivity temperature of nano fluids, Brownian motion of the particle, and with the additives. Table 1 shows the selective summary of the thermal conductivity enhancement in Al2O3-based nanofluids. Table 1[27] 2. LITERATURE REVIEW RELATED TO HEAT EXCHANGER USING NANO FLUID 2.1 Heat exchanger using nano fluid in counter flow direction Here we are using heat exchanger of counter flow direction type .Tuckerman and Pease [9] are the first to introduce this idea by using micro channel heat sink (MCHS) as a source for cooling of electronic devices in the year 1981. They experimentally narrated the MCHS capability and claimed that they were able to dissipate heat flux at a rate of 790 W/cm2. They showed that the convective heat transfer of single phase flows could be improved by decreasing the width of the heat sink channels and increasing wetted area by the heat transfer fluid. The experimental and analytical studies by Wang et al. [10], Lee et al. [11], Wang et al. [12] and Koo and Kleinstreuer [13] showed that nanofluid have a higher thermal conductivity than that of pure fluids and therefore has great affinity for heat transfer enhancement. Li and Xuan [14], Xuan and Li [15] and Pak and Cho [16] experimentally showed the convection heat transfer and pressure dropping for nano fluid tube flows. Their results show that heat transfer coefficient was greatly incremented and it depends upon factors like Reynolds number, particle size and shape, and particle volume fraction. They also found that nano particles did not cause an extra pressure drop. Another scientist named Donsheng and Yulog [17] studied practically the convective heat transfer of nanofluid made up of ã-Al2O3- water, flowing through a tube made up of copper in the laminar flow region and showed a considerable enhancement of convective heat transfer using the nanofluids. The enhancement was particularly significant in the entrance region as it was higher than that obtained solely due to the enhancement on thermal conduction. Seok and Choi [18] investigated IJAET/Vol.III/ Issue IV/Oct.-Dec., 2012/49-54PDF Image | HEAT EXCHANGER USING NANO FLUID
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