Fig. 3 demonstrates the variation of Nusselt number with volumetric
flow rate for three different types of nanofluids. The Nusselt
number of coiled tube heat exchanger increases steadily with
increasing the volume flow rate and particle volume concentration.
Nusselt number was calculated from Eq. (15). The equation clearly
demonstrates the Nusselt number is a function of Reynolds number
and vol.% of nanoparticles. It is clear for any fluid that, which
has a higher Reynolds number, should provide greater Nusselt
number and as well as better heat transfer coefficient. Here, the results
are similar to that observed by Xuan and Li [28] and Heris
et al. [29].
Fig. 4 illustrates the changes of Reynolds number of a helical
coil heat exchanger between the volume flow rate 3–6 L/min. As
can be seen, the Reynolds number increases steadily with increasing
the volume flow rate. Since, the Reynolds number mostly depends
on mass flow rate, and the mass flow rate of CuO/water
nanofluids is higher than Al2O3/water and ZnO/water due to its
higher density [30]. Hence, CuO/water could literally improve Reynolds
number much higher than the other two nanofluids.
Fig. 3 demonstrates the variation of Nusselt number with volumetric
flow rate for three different types of nanofluids. The Nusselt
number of coiled tube heat exchanger increases steadily with
increasing the volume flow rate and particle volume concentration.
Nusselt number was calculated from Eq. (15). The equation clearly
demonstrates the Nusselt number is a function of Reynolds number
and vol.% of nanoparticles. It is clear for any fluid that, which
has a higher Reynolds number, should provide greater Nusselt
number and as well as better heat transfer coefficient. Here, the results
are similar to that observed by Xuan and Li [28] and Heris
et al. [29].
Fig. 4 illustrates the changes of Reynolds number of a helical
coil heat exchanger between the volume flow rate 3–6 L/min. As
can be seen, the Reynolds number increases steadily with increasing
the volume flow rate. Since, the Reynolds number mostly depends
on mass flow rate, and the mass flow rate of CuO/water
nanofluids is higher than Al2O3/water and ZnO/water due to its
higher density [30]. Hence, CuO/water could literally improve Reynolds
number much higher than the other two nanofluids.
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