Numerical Investigation of the Effect of Twisted Tape in a Tube Using Water-TiO2 Nanofluid on Heat Transfer Enhancement

Year 2019, Volume: 3 Issue: 2, 65 - 73, 10.10.2019

Toygun Dağdevir , Orhan Keklikcioglu , Veysel Ozceyhan

Abstract

In
this study, effects of inserting twisted tape into a horizontal tube and adding
TiO₂ nanoparticle to water on heat transfer enhancement performance
and pressure drop penalty are investigated with using CFD program. Analyses are
carried out with Reynolds number of in range from 7860 to 15860, and constant
heat flux of 50kW/m2K is applied to wall of the tube. To simulate turbulent
nanofluid flow k-ω standard turbulent model is applied for all cases. TiO₂
particles with diameter of 10 nm dispersed in water with volume fraction of
0.2% - 2.0% are used as the working fluid. To create swirl flow and enhance
heat transfer, the twisted tape (constant twist ratio is y/W=3.0) is used in
this study. The results show that adding nanoparticle to water causes to get
more convective heat transfer coefficient as from 6% (for 0.2% vol. fract.) to
11% (for 2.0% vol. fract.) in a smooth tube. Furthermore, both adding
nanoparticle to water and inserting the twisted tape to the smooth tube causes
to 1.44 times greater convective heat transfer coefficient than case of smooth
tube and water. In addition to heat transfer performance, pressure drop penalty
is investigated in this study. Increasing nanoparticles in the water increase
pressure drop penalty slightly, but using twisted tape in the smooth tube
increases pressure drop penalty as about 6.5 times more.

Keywords

CFD, nanofluid, twisted tape, heat transfer, pressure drop

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