Continuum Mechanics and Thermodynamics

, Volume 30, Issue 3, pp 657–666 | Cite as

A numerical approach in describing ionanofluids behavior in laminar and turbulent flow

  • Elena Ionela Chereches
  • K. Viswanatha Sharma
  • Alina Adriana Minea
Original Article
  • 32 Downloads

Abstract

Ionic liquids are a new class of fluids to be considered for heat transfer due to their remarkable thermophysical properties. Experimental researches on ionic liquids have increased over the last few years and, as an extension, a new class of heat transfer fluids, the ionanofluids were considered in some recent experimental studies. Ionanofluids consists in suspending little amounts of high conductive nanoparticles in ionic liquids. In spite of a lot of inconsistent reports—mainly due to the deficient understanding of the involved mechanisms—ionanofluids have been demonstrated as a new favorable heat transfer fluid. The enhanced thermal conductivity of ionanofluids over the basic ionic liquids is considered one of the driving factors for enhancing convection. Nonetheless, the thermal conductivity is the most studied parameter in spite of the important influence of viscosity variation on the convective flow. This numerical study employed Ansys Fluent commercial code and showed that a correct description of thermophysical properties may make ionanofluids a very promising new heat transfer fluid since the preliminary results are encouraging.

Keywords

Ionic liquids Ionanofluids Alumina nanoparticle Thermal conductivity Nusselt number 

List of symbols

\({c}_{\mathrm{p}}\)

Specific heat (J/kg K)

D

Hydraulic diameter (m)

h

Heat transfer coefficient (\(\hbox {W/m}^{2}\) K)

k

Thermal conductivity (W/m K)

L

Length (m)

Nu

Nusselt number, dimensionless

P

Dimensionless pressure

Pr

Prandtl number, dimensionless

q

Heat flux (\(\hbox {W/m}^{2}\))

r

Radius (m)

R

Ray, \(R = D/2\)

Re

Reynolds number, dimensionless

T

Temperature (K)

U

Dimensionless tangential velocity

uvw

Velocity components (m/s)

\({u}_{\infty }\)

Average velocity for inlet flow

v

Axial velocity

V

Dimensionless radial velocity

W

Dimensionless axial velocity

XYZ

Non-dimensional coordinates

xyz

Cartesian coordinates (m)

Greek symbols

\(\alpha \)

Thermal diffusivity

\(\delta _{\mathrm{t}}\)

Thermal boundary layer thickness (m)

\(\varphi \)

Fraction of particles

\(\mu \)

Fluid dynamic viscosity

\(\rho \)

Density (kg/m\(^{3}\))

\(\varTheta \)

Dimensionless temperature

Subscripts

\(\infty \)

Refers to inlet flow

b

Refers to bulk temperature

bf

Refers to base-fluid

il

Refers to base-fluid—ionic liquid

inf

Refers to ionanofluid property

m

Refers to a mean value

mexit

Refers to a mean value on exit

n

Refers to nanoparticle

r

Refers to “ionanofluid/base-fluid” ratio

T

Constant wall temperature

w

Value on the wall surface

x

Based on length x

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Technical University “Gheorghe Asachi” from IasiIasiRomania
  2. 2.Department of Mechanical Engineering, Center for Energy StudiesJNTUH College of EngineeringKukatpally, HyderabadIndia

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