University of Sistan and Baluchestan,
Iranian Society Of Mechanical Engineers
Transport Phenomena in Nano and Micro Scales
2322-3634
4
1
2016
01
05
Conjugate Heat Transfer of MHD non-Darcy Mixed Convection Flow of a Nanofluid over a Vertical Slender Hollow Cylinder Embedded in Porous Media
1
10
EN
B.
Jafarian
Department of Chemical Engineering, Persian Gulf University, 75168, Boushehr, I. R.Iran
M.
Hajipour
Faculty of Sciences, Science and Research Branch, Islamic Azad University, Tehran, I. R. Iran
R.
Khademi
Department of Chemical Engineering, University of Sistan and Baluchestan, 98164-161, Zahedan, I. R.Iran
ramin.khademi85@gmail.com
10.7508/tpnms.2016.01.001
In this paper, conjugate heat transfer of magneto hydrodynamic mixed convection of nanofluid about a vertical slender hollow cylinder embedded in a porous medium with high porosity have been numerically studied. The Forchheimer’s modification of Darcy’s law was used in representing the nanofluid motion inside the porous media. The governing boundary layer equations were transformed to non-dimensional differential equations by taking suitable similarity variables and solved numerically using differential quadrature method (DQM). The interfacial (solid-liquid) temperature distribution and the variations of velocity and temperature within boundary layer for different values of governing parameter in presence of uniform magnetic field have been presented and discussed. Our results demonstrate that heat transfer rate can enhance using nanofluid as well as porous medium, while magnetic field has no remarkable effect on the parameter. The computed results were also compared with those available in the existing literature and a good agreement was observed.
Conjugate heat transfer,differential quadrature method (DQM),Magneto hydrodynamic (MHD),MHD-mixed convection,Nanofluid
http://tpnms.usb.ac.ir/article_2214.html
http://tpnms.usb.ac.ir/article_2214_beef3d1e5310e5883f92d7be578ea9ff.pdf
University of Sistan and Baluchestan,
Iranian Society Of Mechanical Engineers
Transport Phenomena in Nano and Micro Scales
2322-3634
4
1
2016
01
05
Numerical Study of Single Phase/Two-Phase Models for Nanofluid Forced Convection and Pressure Drop in a Turbulence Pipe Flow
11
18
EN
M.
Esfandiary
Department of Mechanical Engineering, University of Bu Ali Sina, Hamedan, I. R.Iran
A.
Habibzadeh
Department of Mechanical Engineering, Miandoab Branch, Islamic Azad University, Miandoab, I. R. Iran
amin.habibzadeh@yahoo.com
H.
Sayehvand
Department of Mechanical Engineering, University of Bu Ali Sina, Hamedan, I. R.Iran
10.7508/tpnms.2016.01.002
In this paper, the problem of turbulent forced convection flow of water- alumina nanofluid in a uniformly heated pipe has been thoroughly investigated. In numerical study, single and two-phase models have been used. In single-phase modeling of nanofluid, thermal and flow properties of nanofluid have been considered to be dependent on temperature and volume fraction. Effects of volume fraction and Reynolds number (3000
Heat transfer,Nanofluid,Single Phase/Two-Phase Models,Tube flow,Turbulent Forced convection
http://tpnms.usb.ac.ir/article_2215.html
http://tpnms.usb.ac.ir/article_2215_7090436c2c4520b7deff9d521cb13a10.pdf
University of Sistan and Baluchestan,
Iranian Society Of Mechanical Engineers
Transport Phenomena in Nano and Micro Scales
2322-3634
4
1
2016
01
05
The effect of various conductivity and viscosity models considering Brownian motion on nanofluids mixed convection flow and heat transfer
19
28
EN
H. R.
Ehteram
Department of Mechanical Engineering, Mechanical Engineering University of Kashan, Kashan, I. R. Iran
A. A.
Abbasian Arani
Department of Mechanical Engineering, Mechanical Engineering University of Kashan, Kashan, I. R. Iran
G. A.
Sheikhzadeh
Department of Mechanical Engineering, Mechanical Engineering University of Kashan, Kashan, I. R. Iran
sheikhz@kashanu.ac.ir
A.
Aghaei
Department of Mechanical Engineering, Mechanical Engineering University of Kashan, Kashan, I. R. Iran
A. R.
Malihi
Department of Mechanical Engineering, Mechanical Engineering University of Kashan, Kashan, I. R. Iran
alirezaaghaei21@gmail.com
10.7508/tpnms.2016.01.003
In this paper the effect of using various models for conductivity and viscosity considering Brownian motion of nanoparticles is investigated. This study is numerically conducted inside a cavity full of Water-Al2O3 nanofluid at the case of mixed convection heat transfer. The effect of some parameters such as the nanoparticle volume fraction, Rayleigh, Richardson and Reynolds numbers has been examined. The governing equations with specified boundary conditions has been solved using finite volume method. A computer code has been prepared for this purpose. The results are presented in form of stream functions, isotherms, Nusselt number and the flow power with and without the Brownian motion taken into consideration. The results show that for all the applied models the stream functions and isotherm have approximately same patterns and no considerable difference has been observed. In all the studied models when considering the Brownian motion, the average Nusselt number is higher than not taking this effect into account. The models of Koo-Kleinstreuer and Li-Kleinstreuer give almost same values for the maximum stream function and average Nusselt number. It is also true about the models of Vajjha-Das and Xiao et al.
Brownian motion,Mixed convection,Nanofluid,Numerical study,Variable properties
http://tpnms.usb.ac.ir/article_2216.html
http://tpnms.usb.ac.ir/article_2216_acc4482d70d701a445174681a004e16b.pdf
University of Sistan and Baluchestan,
Iranian Society Of Mechanical Engineers
Transport Phenomena in Nano and Micro Scales
2322-3634
4
1
2016
01
05
A numerical investigation of γ-Al2O3-water nanofluids heat transfer and pressure drop in a shell and tube heat exchanger
29
35
EN
P.
Shahmohammadi
Department of Chemical Engineering, Quchan University of Advanced Technology, 67335-94771, Quchan, I.R. Iran
H.
Beiki
Department of Chemical Engineering, Quchan University of Advanced Technology, 67335-94771, Quchan, I.R. Iran
hbeiki@qiet.ac.ir
10.7508/tpnms.2016.01.004
The effect of γ-Al2O3 nanoparticles on heat transfer rate, baffle spacing and pressure drop in the shell side of small shell and tube heat exchangers was investigated numerically under turbulent regime. γ-Al2O3-water nanofluids and pure water were used in the shell side and the tube side of heat exchangers, respectively. Since the properties of γ-Al2O3-water nanofluids were variable, they were defined using the user define function. The results revealed that heat transfer and pressure drop were increased with mass flow rate as well as baffle numbers. Adding nanoparticles to the based fluid did not have a significant effect on pressure drop in the shell side. The best heat transfer performance of heat exchangers was for γ-Al2O3-water 1 vol.% and higher nanoparticles concentration was not suitable. The suitable baffle spacing was 43.4% of the shell diameter, showing a good agreement with Bell-Delaware method.
Baffle spacing,CFD models,γ-Al2O3-water nanofluids,Shell and tube heat exchanger,User define function (UDF)
http://tpnms.usb.ac.ir/article_2217.html
http://tpnms.usb.ac.ir/article_2217_fc03640ade649816fa27a7dc2ef54146.pdf
University of Sistan and Baluchestan,
Iranian Society Of Mechanical Engineers
Transport Phenomena in Nano and Micro Scales
2322-3634
4
1
2016
01
05
Lattice Boltzmann simulation of EGM and solid particle trajectory due to conjugate natural convection
36
43
EN
J.
Alinejad
Department of Mechanical Engineering, Sari Branch, Islamic Azad University, Sari, I. R. Iran
alinejad_javad@iausari.ac.ir
J. A.
Esfahani
Department of Mechanical Engineering, Ferdowsi University of Mashhad, Mashhad 91775-1111, I. R. Iran
10.7508/tpnms.2016.01.005
The purpose of this paper is to investigate the EGM method and the behavior of a solid particle suspended in a twodimensional rectangular cavity due to conjugate natural convection. A thermal lattice Boltzmann BGK model is implemented to simulate the two dimensional natural convection and the particle phase was modeled using the Lagrangian–Lagrangian approach where the solid particles are treated as points moving in the computational domain as a result of the fluid motion. Entropy generation due to heat transfer irreversibility, isotherms, streamlines and Nusselt numbers were obtained and discussed. Total entropy generations in various cases are also reported and optimum case is presented based on minimum entropy generation.
Conjugate convection,Entropy generation,Lagrangian–Lagrangian (L–L),Lattice Boltzmann model,particle trajectory
http://tpnms.usb.ac.ir/article_2218.html
http://tpnms.usb.ac.ir/article_2218_409b21d322ba65244aea5bac67863989.pdf
University of Sistan and Baluchestan,
Iranian Society Of Mechanical Engineers
Transport Phenomena in Nano and Micro Scales
2322-3634
4
1
2016
01
05
MHD Boundary Layer Flow of a Nanofluid over an Exponentially Permeable Stretching Sheet with radiation and heat Source/Sink
44
51
EN
N.
Kishan
Department of Mathematics, Osmania University, Hyderabad Telangana, India
C.
Kalyani
Department of Mathematics, R.B.V.R.R. women’s college, Hyderabad Telangana, India
kpskalyani_1996@yahoo.com
M.
Chenna Krishna Reddy
Department of Mathematics, Osmania University, Hyderabad Telangana, India
10.7508/tpnms.2016.01.006
The problem of steady Magnetohydrodynamic boundary layer flow of an electrically conducting nanofluid due to an exponentially permeable stretching sheet with heat source/sink in presence of thermal radiation is numerically investigated. The effect of transverse Brownian motion and thermophoresis on heat transfer and nano particle volume fraction considered. The governing partial differential equations of mass, momentum, energy and nanoparticle volume fraction equations are reduced to ordinary differential equations by using suitable similarity transformation. These equations are solved numerically using an implicit finite difference scheme, for some values of flow parameters such as Magnetic parameter (M), Wall mass transfer parameter(S), Prandtl number(Pr), Lewis number (Le), Thermophoresis parameter (Nt), Brownian motion parameter(Nb), Radiation parameter (R). The numerical values presented graphically and analized for velocity, temperature and nanoparticle volume fraction.
Keller box,MHD,Nanofluid,Stretching permeable sheet,thermal radiation
http://tpnms.usb.ac.ir/article_2219.html
http://tpnms.usb.ac.ir/article_2219_af3d6715bca2686cfae0355e316dcd4a.pdf
University of Sistan and Baluchestan,
Iranian Society Of Mechanical Engineers
Transport Phenomena in Nano and Micro Scales
2322-3634
4
1
2016
01
05
Investigation of two phase unsteady nanofluid flow and heat transfer between moving parallel plates in the presence of the magnetic field using GM
52
58
EN
N.
Hedayati
Babol University of Technology, Department of Mechanical Engineering, Babol, I. R.Iran
nima.hedayati883@gmail.com
A.
Ramiar
Babol University of Technology, Department of Mechanical Engineering, Babol, I. R.Iran
10.7508/tpnms.2016.01.007
In this paper, unsteady two phase simulation of nanofluid flow and heat transfer between moving parallel plates, in presence of the magnetic field is studied. The significant effects of thermophoresis and Brownian motion have been contained in the model of nanofluid flow. The three governing equations are solved simultaneously via Galerkin method. Comparison with other works indicates that this method is very applicable to solve these problems. The semi analytical analysis is accomplished for different governing parameters in the equations e.g. the squeeze number, Eckert number and Hartmann number. The results showed that skin friction coefficient value increases with increasing Hartmann number and squeeze number in a constant Reynolds number. Also, it is shown that the Nusselt number is an incrementing function of Hartmann number while Eckert number is a reducing function of squeeze number. This type of results can help the engineers to make better and researchers to investigate faster and easier.
Brownian,Galerkin method (GM),Eckert number,Hartmann number,Nanofluid,Thermophoresis
http://tpnms.usb.ac.ir/article_2220.html
http://tpnms.usb.ac.ir/article_2220_50ed5c7dbf662ee9f6258e90fa073876.pdf