Abstract:
Advancements in electronics technology have significantly improved human lives
but have also introduced new challenges in managing device performance. The trend
towards smaller and more portable devices has intensified the need for efficient thermal
management solutions. Traditional cooling systems are often inadequate for dissipation of
heat from electronic chips.
This research is based on predicting the thermal effects and hydrodynamics of
single-phase micro-heat exchangers integrated with LVGs, utilizing the introduction of
nanofluids via the use of CFD model equations. The geometry of the models is created in
SOLIDWORKS, and numerical computations are conducted in ANSYS Fluent R21
following mesh generation in ANSYS Workbench. Nanofluids of different types and
concentration are studied to find optimum nanofluid while considering pressure drop,
Nusselt number and space occupied by micro-channel. Temperature boundary conditions
is applied to study best concentration and type of nanofluid depending upon performance
parameters including Nusselt number (Nu), drop in pressure, temperature of base and
friction factors. This study conducts a simulations of the 3D laminar flow of several
nanofluids in a rectangular duct featuring a longitudinal vortex generator. The finite
volume approach is utilized for solving the energy, mass and momentum governing
equations. The impact of nanoparticle type, Reynolds number and concentration, on the
drop in pressure and coefficient of heat transfer of the nanofluids is investigated. The range
of the Reynolds number was from 200 to 1200. For both the lower and LVG walls, a
constant surface temperature was assumed. Eight nanofluids were considered in which
Al₂O₃, CuO, and SiO₂, Ag, Cu, Fe3O4 suspended in water while two trihybrid nanofluids:
Ag-Cu-Fe3O4 and Al₂O₃-SiO2-TiO2 suspended in ethyleneglycol. The concentrations of
nanoparticles varied between 1% and 4%.
The results revealed that for trihybrid fluid Al₂O₃-SiO2-TiO2-ethylene glycol
nanofluid at 1% concentration and a RE number of 1200, the average Nusselt number was
roughly 164% higher than at a RE number of 200 which participates in enhancing
convective heat transfer capability of micro-channel.