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

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DOI: https://doi.org/10.30564/jmmr.v5i1.4364

Abstract:
The efficiency and irreversibility defined based on the second law of
thermodynamics provide a new path for heat exchangers design and make
performance analysis more straightforward and elegant. The second law
of thermodynamics is applied in a Straight Microchannel Printed Circuit
heat exchanger to determine the thermal performance of different shapes of
Boehmite Alumina compared to Al2O3 aluminum oxide. The various forms
of non-spherical Boehmite Alumina are characterized dynamically and
thermodynamically through dynamic viscosity and thermal conductivity,
using empirical coefficients. The non-spherical shape includes platelet,
cylindrical, blades, and bricks forms. Graphical results are presented for
thermal efficiency, thermal irreversibility, heat transfer rate, and nanofluid
exit temperature. The non-spherical shapes of Boehmite Alumina show
different thermal characteristics concerning the spherical shape when
there are variations in fluid flow rates and the nanoparticles fraction.
Furthermore, it was theoretically demonstrated that non-spherical particles
have higher heat transfer rates than spherical particles, emphasizing
platelets and cylindrical shapes for the low volume fraction of nanoparticles
and bricks and blades for high volume fraction.
References:

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