Abstract
In this study, heat and mass transfer characteristic of unsteady nanofluid flow between two parallel plates is investigated considering thermal radiation. Two phase model is considered in order to simulate nanofluid. The basic partial differential equations are reduced to ordinary differential equations which are solved numerically using the fourth-order Runge–Kutta method. The effects of the squeeze number, radiation parameter, Schmidt number, Brownian motion parameter, thermophoretic parameter and Eckert number on flow, heat and mass transfer are considered. Results indicate that concentration boundary-layer thickness increases with increase of Radiation parameter. Also it can be found that Nusselt number has direct relationship with Eckert number, Schmidt number, squeeze parameter and Radiation parameter.
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Abbreviations
- \( C \) :
-
Nanofluid concentration
- \( c_{\text{p}} \) :
-
Specific heat at constant pressure
- \( D_{\text{B}} \) :
-
Brownian diffusion coefficient
- \( D_{\text{T}} \) :
-
Thermophoretic diffusion coefficient
- \( {\text{Ec}} \) :
-
Eckert number \( \left( { = \frac{1}{{c_{\text{p}} }}\,\left( {\frac{\beta x}{{2\left( {1 - \beta t} \right)}}} \right)^{2} } \right) \)
- \( k \) :
-
Thermal conductivity
- \( \text{Nb} \) :
-
Brownian motion parameter \( ( = (\rho c)_{\text{p}} D_{\text{B}} (\phi_{\text{h}} - \phi_{\text{c}} )/(\rho c)_{f} \alpha ) \)
- \( \text{Nt} \) :
-
Thermophoretic parameter \( ( = (\rho c)_{\text{p}} D_{\text{T}} (T_{\text{h}} - T_{\text{c}} )/[(\rho c)_{f} \alpha T_{\text{c}} ]) \)
- \( \text{Nu} \) :
-
Nusselt number
- \( q_{\text{r}} \) :
-
Radiation heat flux
- \( \text{Rd} \) :
-
Radiation parameter \( \left( { = 4\sigma_{\text{e}} T_{\text{c}}^{3} /\left( {\beta_{\text{R}} k} \right)} \right) \)
- \( \text{Pr} \) :
-
Prandtl number \( ( = \mu /\rho_{f} \alpha ) \)
- P :
-
Pressure
- \( S \) :
-
Squeeze number \( \left( { = \beta l^{2} \rho_{f} /2\mu } \right) \)
- \( \text{Sc} \) :
-
Lewis number \( ( = \alpha /D_{\text{B}} ) \)
- \( T \) :
-
Fluid temperature
- \( u,v \) :
-
Velocity components in the x-direction and y-direction
- \( x,y \) :
-
Space coordinates
- \( \alpha \) :
-
Thermal diffusivity \( \left( { = \frac{k}{{\left( {\rho c_{P} } \right)_{f} }}} \right) \)
- \( \mu \) :
-
Dynamic viscosity of nanofluid
- \( \theta \) :
-
Dimensionless temperature \( \left( { = T/T_{\text{H}} } \right) \)
- \( \phi \) :
-
Dimensionless concentration (=C/C H)
- \( \rho \) :
-
Density
- \( \sigma_{\text{e}} \) :
-
Stefan–Boltzmann constant
- \( \beta_{\text{R}} \) :
-
Mean absorption coefficient
- c:
-
Cold
- H:
-
Hot
- h:
-
High
- f:
-
Base fluid
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Technical Editor: Francisco Ricardo Cunha.
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Sheikholeslami, M., Ganji, D.D. Unsteady nanofluid flow and heat transfer in presence of magnetic field considering thermal radiation. J Braz. Soc. Mech. Sci. Eng. 37, 895–902 (2015). https://doi.org/10.1007/s40430-014-0228-x
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DOI: https://doi.org/10.1007/s40430-014-0228-x