Nanofluid Implementation in Heat Exchanger Geometries
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Department of Mechanical and Production Engineering(MPE), Islamic University of Technology(IUT)
Abstract
In recent years, nanotechnology has evolved as an important field that employs
sophisticated "green" nanoparticles incorporated in conventional engineering
resources. The heat transfer performance of nanofluids is superior to that of traditional
heat transfer fluids. Suspending nanoparticles in nanofluids increases the ratio of
contact surface to volume. Consequently, they can be placed evenly to maximize heat
transfer without incurring a significant decrease in pressure. In the cooling and heating
sectors, nanofluids are a preferred heat transfer fluid due to these benefits. The
considerable increase in heat conductivity that nanoparticles provide has made
nanofluids highly desirable for a variety of energy applications. In the past decade,
thermal effects of nanofluids in both forced and free convection flows have been of
great interest to researchers. In our current study, we investigated the influence of
nanofluid coolants in spherical dimpled surfaces on heat transfer and pressure drop. The
primary purpose of this research is to assess the thermal performance of nanofluids with
regard to varying Reynolds numbers and nanoparticle volume concentrations in a
dimpled channel flow. Assuming a constant and uniform heat flux of 10000 w/m2, the
simulations are performed at Reynolds numbers from 10000 to 30000. The
computational fluid dynamics solver ANSYS Fluent is used to analyze the effective
properties of nanofluids based on models presented in the literature. There is a
discussion on the results of heat transfer coefficient, temperature distributions, Nusselt
number, pressure drop, and friction factors for all the scenarios. Different nanoparticle
compositions were shown to have a 20-25% higher heat transfer coefficient for dimpled
channels compared to smooth ones. With increasing volume fractions, it was found that
heat transfer and pressure drop values did go up. Nusselt number grows as more
complex corrugations are being used. Because the performance evaluation factor (PEF)
for corrugated geometries is greater than unity, they can surpass smooth pipes. In
addition to the decrease in PEF values, both Re and PEF advances show a decreasing
trend as well.
Description
Supervised by
Dr. Mohammad Monjurul Ehsan,
Associate Professor,
Department of Mechanical and Chemical Engineering(MPE),
Islamic University of Technology(IUT),
Board Bazar, Gazipur-1704, Bangladesh
Keywords
heat transfer, 3D corrugated pipe, dimpled surface, friction factor, hybrid nanofluid, PEC, heat exchanger
Citation
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