In order to investigate the effect of various volumetric flow
rates on the heat transfer and entropy generation, three different
nanofluids with four diverse particle volume fractions have been
considered in the analysis for the working fluid.
Fig. 2 clarifies the variation of the heat transfer coefficient for
nanofluids with four distinct particles volume concentrations at diverse
volumetric flow rates. Volume flow rates of nanofluids were
varied from 3 to 6 L/min. The value of heat transfer coefficient
went up with the increase of volumetric flow rate and nanoparticles
volume concentration. Usually enhanced heat transfer coefficient
is observed for adding nanoparticles in base fluids. It is the
response of enhance thermal conductivity of nanofluids. Nanoparticles
dispersion not only effects on the thermal conductivity but
also, it changes the flow and thermal fields that can improve the
heat transfer coefficient. Hence, greater convective heat transfer
coefficient was found for higher particles volume fraction. Moreover,
chaotic motion of the CuO, Al2O3, ZnO nanoparticles in flow
will disturb the thermal boundary layer formation on the tube surface
and greater heat transfer coefficients are achieved of fluid flow
in a helical coil heat exchanger. From the Fig. 2, it is clear that
7.14% enhancement in heat transfer coefficient might be achieved
by using CuO/water nanofluids compare to Al2O3/water and ZnO/
water nanofluids. Results are agreed with Rostamani [27].
In order to investigate the effect of various volumetric flow
rates on the heat transfer and entropy generation, three different
nanofluids with four diverse particle volume fractions have been
considered in the analysis for the working fluid.
Fig. 2 clarifies the variation of the heat transfer coefficient for
nanofluids with four distinct particles volume concentrations at diverse
volumetric flow rates. Volume flow rates of nanofluids were
varied from 3 to 6 L/min. The value of heat transfer coefficient
went up with the increase of volumetric flow rate and nanoparticles
volume concentration. Usually enhanced heat transfer coefficient
is observed for adding nanoparticles in base fluids. It is the
response of enhance thermal conductivity of nanofluids. Nanoparticles
dispersion not only effects on the thermal conductivity but
also, it changes the flow and thermal fields that can improve the
heat transfer coefficient. Hence, greater convective heat transfer
coefficient was found for higher particles volume fraction. Moreover,
chaotic motion of the CuO, Al2O3, ZnO nanoparticles in flow
will disturb the thermal boundary layer formation on the tube surface
and greater heat transfer coefficients are achieved of fluid flow
in a helical coil heat exchanger. From the Fig. 2, it is clear that
7.14% enhancement in heat transfer coefficient might be achieved
by using CuO/water nanofluids compare to Al2O3/water and ZnO/
water nanofluids. Results are agreed with Rostamani [27].
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