Improvement of heat transfer in helical HX with multiple-head ribbed using water-based nanofluids
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Department of Mechanical and Production Engineering (MPE),Islamic University of Technology(IUT), Board Bazar, Gazipur, Bangladesh
Abstract
This study shows the comparison between the helical and straight tube heat exchangers with
multiple-head ribbed geometries. A computational fluid dynamics model with constant wall
temperature condition was developed for the study and validated against a numerical study and
particular experimental correlations. Two, three, and four head ribbed geometries were used for
both the helical and straight tubes. Also, different revolutions of ribbed geometry were taken into
consideration while designing the HXs for the comparison of heat transfer. Number of 10, 20,
and 30 coil revolutions were used in this study. Four different water-based nanofluids, such as
Al2O3, CuO, SiO2, ZnO used in the best heat exchanger. Results have been shown in terms of the
effect of ribbed geometry, coil revolutions, velocity, and temperature distribution along the pipe
and the effect of nanofluid in the heat exchanger. Helical tube heat exchangers are more effective
than straight tube heat exchangers in terms of heat transfer. It was found that the lesser the
number of ribbed heads, the higher the heat transfer for both helical and straight heat exchangers.
On the other side, when the number of coil revolution of ribbed profile increases, the heat
transfer is also increased for both helical and straight heat exchangers. So, the two head ribbed
with 30 coil revolutions helical heat exchanger ensures the highest amount of heat transfer rate.
And four head ribbed with 10 coil revolution straight tube heat exchanger has got the lowest
value of heat transfer rate. In the nanofluid study, it is found that the Al2O3 water-based
nanofluid has the highest heat transfer rate among the four nanoparticles. Finally, this study
represents the perfect comparison to choose the right type of heat exchanger and the
nanoparticle.
Description
Supervised by
Dr. Arafat Ahmed Bhuiyan,
Department of Mechanical and Production Engineering(MPE),
Islamic University of Technology(IUT),
Board bazar, Gazipur-1704. Bangladesh
Keywords
Heat Transfer, Laminar flow, Helical heat exchanger, Multiple-head ribbed tube, Water-based Nanofluid.
Citation
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