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Unsteady Boundary Layer Flow and Convective Heat Transfer of a Fluid Particle Suspension with Nanoparticles over a Stretching Surface

  • B. C. Prasannakumara EMAIL logo , B. J. Gireesha , M. R. Krishnamurthy and Rama Subba Reddy Gorla
Published/Copyright: June 8, 2017
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Abstract

We analyzed the effects of Biot number and non-uniform heat source/sink on boundary layer flow and nonlinear radiative heat transfer of fluid particle suspension over an unsteady stretching surface embedded in a porous medium with nanoparticles. We considered conducting dust particles embedded with -water nanopartcles. The governing equations are transformed into nonlinear ordinary differential equations by using local similarity transformations and solved numerically using Runge–Kutta-Fehlberg-45 order method along with shooting technique. The effects of non-dimensional parameters on velocity and temperature profiles for fluid phase and dust phase are discussed and presented through graphs. Also, friction factor and Nusselt number are discussed and presented through graphs. Comparisons of the present study were made with existing studies under some special assumptions. The present results have an excellent agreement with existing studies. Results indicated that the enhancement in fluid particle interaction parameter increases the heat transfer rate and depreciates the wall friction. Also, radiation parameter has the tendency to increase the temperature profiles of the dusty nanofluid.

Nomenclature

A1and B1

are the parameters of the space and temperature dependent internal heat generation/absorption

Bi

Biot bumber

c

Positive constant

a

Rate of stretching constant

cpf

specific heat of fluid

cmf

specific heat of dust particles

Cf

skin friction coefficient

Ec

Eckert number

K

Stokes drag constant

kf

thermal conductivity of the base fluid

kp

Permeability parameter

ks

thermal conductivity of nanoparticle

knf

thermal conductivity W/mK

k

permeability of the porous medium

k

mean absorption coefficient W/mK

l

mass concentration of particles

m

mass concentration of dust particles

N

number density of dust particlesradiation parameter

Nux

Nusselt number

Pr

Prandtl number

q′′′

is the space and temperature dependent internal heat generation/absorption

qr

radiative heat flux (Wm2)

qw

surface heat flux

Rex

local Reynolds number

r

is the radius of dust particles

T

fluid temperature K

Tp

Temperatures of the dust particles K

T

ambient Surface temperature K

u,v

velocity components along the x and y axis (ms1)

Uwx

stretching velocity

x,y

coordinates m

Greek Symbols
α

unsteady parameter

β

fluid-particle interaction parameter for velocity

βT

fluid-particle interaction parameter for temperature

η

dimensionless similarity variable

γ

specific heat ratio

f

kinematic viscosity of fluid (m2s1)

νnf

kinematic viscosity of nanofluid (m2s1)

ϕ

dimensionless nanoparticle volume fraction

ρcpf

heat capacity of the base fluid,

ρcps

heat capacity of the nanoparticle

ρnf

effective density of the nanofluid

μnf

effective dynamic viscosity of nanofluid

ρf

density of the base fluid kgm3

ρs

density of the nanoparticles kgm3

σ

Stefan-Boltzmann constant Wm2K4

θ

dimensionless temperature variable

θw

Temperature ratio parameter

T

thermal equilibrium time

v

relaxation time of the dust particle

τw

surface shear stress

Subscripts

infinity

w

sheet surface

Acknowledgments

The authors are very much thankful to the editor and referee for their encouraging comments and constructive suggestions to improve the presentation of this manuscript. One of the authors (B.C.Prasannakumara) gratefully acknowledges the financial support of University Grants Commission (UGC), New Delhi, India [F.No-43-419/2014(SR)] for pursuing this work.

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Received: 2017-1-7
Revised: 2017-2-20
Accepted: 2017-3-17
Published Online: 2017-6-8

© 2017 Walter de Gruyter GmbH, Berlin/Boston

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