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Heat and Mass Transfer

, Volume 54, Issue 5, pp 1301–1311 | Cite as

Heat transfer and pressure drop studies of TiO2/DI water nanofluids in helically corrugated tubes using spiraled rod inserts

  • S. Anbu
  • S. Venkatachalapathy
  • S. Suresh
Original
  • 77 Downloads

Abstract

An experimental study on the convective heat transfer and friction factor characteristics of TiO2/DI water nanofluids in uniformly heated plain and helically corrugated tubes (HCT) with and without spiraled rod inserts (SRI) under laminar flow regime is presented in this paper. TiO2 nanoparticles with an average size of 32 nm are dispersed in deionized (DI) water to form stable suspensions containing 0.1, 0.15, 0.2, and 0.25% volume concentrations of nanoparticles. It is found that the inclusion of nanoparticles to DI water ameliorated Nusselt number which increased with nanoparticles concentration upto 0.2%. Two spiraled rod inserts made of copper with different pitches (pi = 50 mm and 30 mm) are inserted in both plain and corrugated tubes and it is found that the addition of these inserts increased the Nusselt number substantially. For Helically corrugated tube with lower pitch and maximum height of corrugation (pc = 8 mm, hc = 1 mm) with 0.2% volume concentration of nanoparticles, a maximum enhancement of 15% in Nusselt number is found without insert and with insert having lower pitch (pi = 30 mm) the enhancement is 34% when compared to DI water in plain tube. The results on friction factor show a maximum penalty of about 53.56% for the above HCT.

Keywords

TiO2/DI waternanofluids Laminar flow Nusselt number Corrugated tubes Thermal performance factor 

Nomenclature

A

cross-sectional area (m2)

Cp

specific heat (J/kgK)

d

test section diameter (m)

f

friction factor

h

heat transfer coefficient (W/m2K)

hc

corrugation height (m)

I

current (A)

L

length of the test section (m)

m

mass flow rate (kg/s)

Nu

Nusselt number (hd/k)

Δp

pressure drop (N/m2)

P

perimeter (m)

Pr

Prandtl number (μCp/k)

pc

corrugation pitch (m)

pi

pitch of insert (m)

Q

heat input (W)

q″

heat flux (W/m2)

R

thermal resistance (°Cm2/W)

Re

Reynolds number (ρvd/μ)

T

temperature (K)

V

voltage (V)

v

fluid velocity (m/s)

X

Axial distance from the entrance (m)

Greek symbols

ρ

Density (kg/m3).

μ

Dynamic viscosity (kg/m2s)

Volume concentration (%)

Subscripts

c

Corrugation

f

Fluid

i

Insert

in

Inlet

nf

Nanofluid

out

Outlet.

pt.

Plain tube

s

Solid phase

t

Total

w

Wall

x

Axial distance from the entrance (m)

Abbreviations

DI

Deionized

HCT

Helically Corrugated Tube

SRI

Spiraled Rod Insert

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringNational Institute of TechnologyTiruchirappalliIndia

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