Theoretical Analysis of Entropy Generation and Exergy Loss of Nanofluid Flow in Hexagonal Microchannel

Optimization is one of the most attractive topics for researchers who aim to improve energy systems performance. This work presents a mathematical analysis of entropy generation and exergy destruction in a microchannel of hexagonal section. A new theoretical model was developed based on Bejan equation, to perform entropy generation numbers, exergy loss and exergy efficiency of various nanofluids flow with different heat fluxes. The results shows that increasing heat flux cause an increase in both entropy and exergy loss due to heat dissipation. Frictional entropy has the highest contribution of total entropy rate. The best exergy efficiency is obtained for certain heat fluxes and it reaches its maximum for pure water.