Straight Microchannel Printed Circuit Heat Exchanger and Influence of Nanoparticle Shapes of Boehmite Alumina on Thermal Performance

The second law of thermodynamics is utilised to compare the thermal performance of different forms of Boehmite Alumina to Al2O3 aluminium oxide in a Straight Microchannel Printed Circuit heat exchanger. Using empirical coefficients for dynamic viscosity and thermal conductivity, the various forms of non-spherical Boehmite Alumina are dynamically and thermodynamically characterised. Non-spherical shapes include platelets, cylindrical objects, blades, and bricks. The figure depicts thermal efficiency, thermal irreversibility, heat transfer rate, and nanofluid departure temperature. The non-spherical shapes of Boehmite Alumina have different thermal characteristics than the spherical shape when fluid flow rates and nanoparticle fractions vary. Furthermore, non-spherical particles have better heat transfer rates than spherical particles, with platelets and cylindrical forms for low volume fraction nanoparticles and bricks and blades for large volume fraction nanoparticles. The efficiency and irreversibility specified by the second law of thermodynamics open up new possibilities for heat exchanger design and make performance analysis more simple and beautiful.

Author(S) Details

√Člcio Nogueira
Department of Mechanic and Energy, State University of Rio de Janeiro, Brazil.

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