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Convective heat transfer studies on helically corrugated tubes with spiraled rod inserts using TiO2/DI water nanofluids

  • S. AnbuEmail author
  • S. Venkatachalapathy
  • S. Suresh
Article
  • 31 Downloads

Abstract

Convective heat transfer and friction factor studies are experimentally carried out in a smooth and five helically corrugated tubes of different heights and pitches of corrugation with spiraled rod inserts. The experiment is conducted under turbulent flow (Re = 4800–8900) and constant wall heat flux conditions. Deionized (DI) water and titanium dioxide (TiO2)/DI water nanofluids are used as working fluids. The average size of TiO2 nanoparticles is 32 nm. Two volume concentrations of nanofluids (0.25 and 0.5%) are used in this study. The combined effects of nanofluids, inserts and corrugation in tubes on Nusselt number and friction factor are investigated. The results indicate that (i) the addition of TiO2 nanoparticles in DI water upsurges the heat transfer rate, which increases with nanofluids volume concentrations; (ii) use of inserts and corrugation in tubes enhances the heat transfer rate further; (iii) among the corrugated tubes, the tube having highest corrugation height (hc = 1 mm) and lowest pitch (pc = 8 mm) with spiraled rod insert of smaller pitch (pi = 30 mm) shows the maximum thermal performance factor of 1.56 for 0.5% volume concentration of nanofluids.

Keywords

Nanofluids Turbulent flow Heat transfer enhancement Friction factor Thermal performance factor 

List of symbols

A

Cross-sectional area (m2)

Cp

Specific heat (J kg−1 K−1)

d

Test section diameter (m)

f

Friction factor

h

Heat transfer coefficient (W m−2 K−1)

hc

Corrugation height (m)

I

Current (A)

L

Length of the test section (m)

m

Mass flow rate (kg s−1)

Nu

Nusselt number

ΔP

Pressure drop (N m−2)

P

Perimeter (m)

pc

Corrugation pitch (m)

pi

Pitch (insert) (m)

Pr

Prandtl number

Q

Electrical heat input (W)

q″

Heat flux (W m−2)

R

Thermal resistance (°C m2 W−1)

Re

Reynolds number

T

Temperature (K)

V

Voltage (V)

v

Fluid velocity (m s−1)

x

Axial distance from tube entrance (m)

Greek symbols

ρ

Density (kg m−3)

μ

Dynamic viscosity (kg m−2 s−1)

Volume concentration (%)

η

Thermal performance factor

Subscripts

c

Corrugation

f

Fluid

i

Insert

in

Inlet

nf

Nanofluid

out

Outlet

pt

Plain tube

s

Solid phase

t

Total

w

Wall

Notes

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringNational Institute of TechnologyTiruchirappalliIndia

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