Open AccessInfluence of Nanoparticle Shapes of Boehmite Alumina on the Thermal Performance of a Straight Microchannel Printed Circuit Heat Exchanger
Author(s) -
Élcio Nogueira
Publication year - 2022
Publication title -
journal of metallic material research
Language(s) - English
Resource type - Journals
ISSN - 2630-5135
DOI - 10.30564/jmmr.v5i1.4364
Subject(s) - boehmite , materials science , microchannel , thermal conductivity , volume fraction , heat transfer , heat exchanger , composite material , micro heat exchanger , nanoparticle , viscosity , thermodynamics , heat transfer coefficient , mechanics , aluminium , nanotechnology , physics
The efficiency and irreversibility defined based on the second law ofthermodynamics provide a new path for heat exchangers design and makeperformance analysis more straightforward and elegant. The second lawof thermodynamics is applied in a Straight Microchannel Printed Circuitheat exchanger to determine the thermal performance of different shapes ofBoehmite Alumina compared to Al2O3 aluminum oxide. The various formsof non-spherical Boehmite Alumina are characterized dynamically andthermodynamically through dynamic viscosity and thermal conductivity,using empirical coefficients. The non-spherical shape includes platelet,cylindrical, blades, and bricks forms. Graphical results are presented forthermal efficiency, thermal irreversibility, heat transfer rate, and nanofluidexit temperature. The non-spherical shapes of Boehmite Alumina showdifferent thermal characteristics concerning the spherical shape whenthere are variations in fluid flow rates and the nanoparticles fraction.Furthermore, it was theoretically demonstrated that non-spherical particleshave higher heat transfer rates than spherical particles, emphasizingplatelets and cylindrical shapes for the low volume fraction of nanoparticlesand bricks and blades for high volume fraction.