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Heat transfer studies in a plate heat exchanger using Fe2O3-water-engine oil nanofluid

Improving heat transfer performance of conventional fluid creates significant
 energy savings in process Industries. In this aspect, experimental study was
 performed to evaluate the heat transfer performance of Fe2O3-Water
 (W)-Engine Oil (EO) nanofluid at different concentrations and different hot
 fluid inlet temperatures in a plate heat exchanger. Experiments were
 conducted by mixing Fe2O3 nanoparticle (45 nm) in a base fluid of
 water-engine oil mixture with volume fractions of 5%EO + 95%W and 10%EO
 +90%W. Main aim of the present study is to assess the impact of variations
 in nanoparticle volume fraction and hot fluid inlet temperature on the heat
 transfer performance of prepared nanofluid. Based on the experimental
 results, convective heat transfer coefficient, Reynolds, Prandtl and Nusselt
 number were determined. Result shows that at the hot fluid inlet temperature
 of 75?C, the increase in Nusselt number and convective heat transfer co
 efficient are optimum at 0.9 vol. % nanoparticle for both the base fluid
 mixtures. The increase in heat transfer coefficient is because of the
 Brownian motion (increasing thermal conductivity) effect, motion caused by
 temperature gradient (Thermo-phoretic) and motion due to concentration
 gradient (Osmophoretic). If the volume fraction of nanoparticle increases
 then Reynolds number increment is higher than Prandtl number decrement,
 which augments Nusselt number as well as convective heat transfer
 coefficient.