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Heat Transfer of TiO2/Water Nanofluid in a Coiled Agitated Vessel with Propeller

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Abstract

An attempt is made to investigate heat transfer enhancement using nanofluid in a coiled agitated vessel fitted with propeller agitator. The heat transfer coefficient in coiled agitated vessel for water and TiO2/water nanofluid of 3 different volume concentrations (0.10%, 0.20% and 0.30%) are estimated and compared. The heat transfer coefficient for nanofluid is found to be higher than that for water and also found to increase with increasing volume concentrations. The enhancement in the convective heat transfer using nanofluid is found to be a maximum of 17.59%. Empirical correlations are separately formed for water and TiO2/water nanofluid as well as found to fit the experimental data within ±5% for water and within ±10% for nanofluid.

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Abbreviations

Ao :

Outside surface area of helical coil

Cp :

Specific heat capacity of water at given temperature

Da :

Diameter of the agitator

Dc :

Average diameter of the helix tubing

do :

Outside diameter of the coiled tube

di :

Inside diameter of the coiled tube

hi :

Inside heat transfer coefficient

hi :

Outside heat transfer coefficient

k:

Thermal conductivity of fluid at given temperature

kc :

Thermal conductivity of coil material

l:

Length of the helical coil

M:

Mass flow rate of water

N:

Rotating speed of agitator

Nu:

Nusselt number

hodo / k:

For outside heat transfer coefficient

hidi /k:

For inside heat transfer coefficient

Pr:

Prandtl number (C p μ/k)

Q:

Average heat transfer rate

Re:

Reynolds number

ρNDa 2 / μ:

For agitator

ρνDi / μ:

For cooling coil tube

TB :

Average bath temperature of agitated liquid medium

Ti :

Inlet temperature of cooling water

Ti,w :

Inside wall temperature of cooling coil

T o :

Outside temperature of cooling water

ΔT ln :

Logarithmic mean temperature difference

U o :

Overall heat transfer coefficient

x w :

helical coil wall thickness

ρ:

Density at given temperature

μ:

Viscosity at given temperature

μ w :

Viscosity at wall temperature

φ:

Volume fraction of nanoparticles

bf:

Base fluid

nf:

Nanofluid

p:

Nano particle

cw:

Cooling water

w:

Water

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Authors and Affiliations

  1. Heat Transfer Research Laboratory, Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli, 620 015, Tamilnadu, India

    V. T. Perarasu, M. Arivazhagan & P. Sivashanmugam

Authors
  1. V. T. Perarasu
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  2. M. Arivazhagan
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  3. P. Sivashanmugam
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Corresponding author

Correspondence to M. Arivazhagan.

Additional information

Biography: PERARASU V. T. (1981-), Male, Master Candidate

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Perarasu, V.T., Arivazhagan, M. & Sivashanmugam, P. Heat Transfer of TiO2/Water Nanofluid in a Coiled Agitated Vessel with Propeller. J Hydrodyn 24, 942–950 (2012). https://doi.org/10.1016/S1001-6058(11)60322-3

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  • DOI: https://doi.org/10.1016/S1001-6058(11)60322-3

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