Investigation on Thermal and Flow behaviours of MWCNT/Water nanofluids in a Cone helically coiled Heat Exchanger by varying pitch sizes of the tube using CFD
Author(s):
Amit Kumar, Prof. Animesh Singhai
ISSN:
2349-6002
Cite This Article:
Investigation on Thermal and Flow behaviours of MWCNT/Water nanofluids in a Cone helically coiled Heat Exchanger by varying pitch sizes of the tube using CFD International Journal of Innovative Research in Technology(www.ijirt.org) ,ISSN: 2349-6002 ,Volume 6 ,Issue 7 ,Page(s):1-7 ,November 2019 ,Available :IJIRT148824_PAPER.pdf
Keywords:
Volume concentration of nanoparticle, Cone helically coiled tube, MWCNT /water nanofluids, Computational fluid dynamics, Pressure drop, Thermal conductivity, Nanofluid viscosity, Pitch size.
Abstract
Coiled tube configurations is widely used in industries like power plants, nuclear reactors, refrigeration and air conditioning , heat recovery system, chemical processing and food industries. The coiled tube is of two types alike helical coil and spiral coiled tube. The flow pattern in helical coiled tube is complicated due to the formation of secondary flows induced by the centrifugal force. Secondary flow provides better thermal contact between the surface of the tube and fluids due to the creation of vertex and resulting the mixture of fluid which improve the temperature gradient. This study investigates the heat transfer and the pressure drop of cone helically coiled tube heat exchanger using (Multi wall carbon nano tube) MWCNT/water nanofluids by varying pitch size of the tubes. The MWCNT/water nanofluids 0.5% particle volume concentrations were used. The simulation were conducted under the turbulent flow in the Dean number range of 2200 < De < 4200. It is found that the maximum overall heat transfer coefficient for pitch=22 mm is 32.23% higher than the pitch=18mm in the Dean number 4200.It is found that the maximum Nusselt number for pitch=22 mm is 14.91% higher than the pitch=18mm in the Dean number 4200.From the pressure and temperature contours it was found that along the outer side of the pipes the velocity and pressure values were higher in comparison to the inner values. It may be concluded that by increasing pitch size of cone helically coiled heat exchanger, the heat transfer rate increases as Nusselt no. and Overall heat transfer increases.
Article Details
Unique Paper ID: 148824

Publication Volume & Issue: Volume 6, Issue 7

Page(s): 1 - 7
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Volume 6 Issue 7

Last Date 25 December 2019


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