University of Sistan and Baluchestan, Iranian Society Of Mechanical Engineers Challenges in Nano and Micro Scale Science and Technology 2821-000X 3 2 2015 06 30 Numerical Study on Low Reynolds Mixing ofT-Shaped Micro-Mixers with Obstacles 68 76 2034 10.7508/tpnms.2015.02.001 EN M.R. Rasouli Biomedical Engineering Division, Life Science Engineering Department, Faculty of New Sciences and Technologies, University of Tehran, Tehran, I.R. Iran A. Abouei Mehrizi Biomedical Engineering Division, Life Science Engineering Department, Faculty of New Sciences and Technologies, University of Tehran, Tehran, I.R. Iran A. Lashkaripour Biomedical Engineering Division, Life Science Engineering Department, Faculty of New Sciences and Technologies, University of Tehran, Tehran, I.R. Iran Journal Article 2015 01 09 Micromixers are one of the most crucial components of Lab-On-a-Chip devices with the intention of mixing and dispersion of reagents like small molecules and particles. The challenge facing micromixers is typically insufficient mixing efficiency in basic designs, which results in longer microchannels. Therefore, it is desirable to increase mixing efficiency, in order to decrease mixing length, which enables miniaturization of Lab-On-Chip devices.  This study investigates two different designs of a passive T-shaped micromixer employing several rectangular obstacles and grooves to monitor mixing efficiency with geometry change, while keeping the Reynolds number under 2. The mixing performance of these geometries is studied by numerical study and it was implemented in COMSOL Multiphysics environment. It was clarified that T-shaped micromixer with obstacles and grooved micromixer improved mixing efficiency of the basic design by 37.2% and 43.8%, respectively. Also, it was shown that this increase in mixing efficiency was due to the development of transversal component of flow caused by the obstacles and grooves. https://chal.usb.ac.ir/article_2034_da536b7d34c59c483fcc918b9404b52e.pdf

University of Sistan and Baluchestan, Iranian Society Of Mechanical Engineers Challenges in Nano and Micro Scale Science and Technology 2821-000X 3 2 2015 06 30 Thermo-Hydraulic Investigation of Nanofluid as a Coolant in VVER-440 Fuel Rod Bundle 77 88 2035 10.7508/tpnms.2015.02.002 EN S. Jalili Palandi Department of Mathematics, Buinzahra Branch, Islamic Azad University, Buinzahra, I.R. Iran School of Mechanical Engineering, Babol University of Technology, Babol, I.R. Iran A. Rahimi-Sbo Department of Mathematics, Buinzahra Branch, Islamic Azad University, Buinzahra, I.R. Iran M. Rahimi-Esbo Department of Mathematics, Buinzahra Branch, Islamic Azad University, Buinzahra, I.R. Iran School of Mechanical Engineering, Babol University of Technology, Babol, I.R. Iran Journal Article 2014 07 19 The main purpose of this study is to perform numerical simulation of nanofluids as the coolant in VVER-440 fuel rod bundle. The fuel rod bundle contains 60 fuel rods with length of 960 mm and 4 spacer grids. In VVER-440 fuel rod bundle the coolant fluid (water) is in high pressure and temperature condition. In the present Thermo-hydraulic simulation, water-AL₂O₃ nanofluids containing various volume fractions of AL₂O₃ nanoparticles are investigated. Calculations performed for Reynolds number of 125000 to 203000, nanoparticles fraction of 0 to 0.05 and nanoparticles diameter of 20 to 100 nm. In this literature, the effects of diameter and volume fraction of nanoparticles on thermo-hydraulic parameters are studied. To perform correct calculation, different grid qualities of fuel rod bundle are studied and results are compared with reference results. Empirical studies show that as the temperature rises, the effect of nanoparticles on enhancing thermal conductivity intensifies. So it can be said that as the VVER-440 fuel rod bundle works in high temperature condition, using the nanofluids in this rod bundle can be effective. Results of our numerical study showed that by using nanofluids as coolant fluid the heat transfer coefficient increases significantly and heat transfer enhancement raises with increase in volume fraction of nanoparticle. https://chal.usb.ac.ir/article_2035_c4dc82fb4d65f6ed3d96f40bf0868fab.pdf

University of Sistan and Baluchestan, Iranian Society Of Mechanical Engineers Challenges in Nano and Micro Scale Science and Technology 2821-000X 3 2 2015 06 30 Multi-Objective Optimization of Tio2-Water Nanofluid Flow in Tubes Fitted With Multiple Twisted Tape Inserts in Different Arrangement 89 99 2036 10.7508/tpnms.2015.02.003 EN H. Safikhani Department of Mechanical Engineering, Faculty of Engineering, Arak University, Arak 38156-88349,Iran S. Eiamsa-ard Department of Mechanical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand Journal Article 2015 04 20 In this paper, experimentally derived correlations of heat transfer and pressure drop are used in a Pareto based Multi-Objective Optimization (MOO) approach to find the best possible combinations of heat transfer and pressure drop of TiO₂-water nanofluid flow in tubes fitted with multiple twisted tape inserts in different arrangement. In this study there are four independent design variables: the number and arrangement of twisted tape inserts (<em>N</em>), TiO₂ volume fraction (<em>φ</em>), Reynolds number (<em>Re</em>) and Prandtl number (<em>Pr</em>). Seven twisted tape arrangement in three different categories are investigated. The objectives are maximizing the non-dimensional heat transfer coefficient (<em>Nu</em>) and minimizing the non-dimensional pressure drop (<em>f Re</em>). <br />It is shown that some interesting and important relationships as useful optimal design principles involved in the thermal performance of nanofluid flow in tubes fitted with multiple twisted tape inserts in different arrangement can be discovered by Pareto based multi-objective optimization approach.  https://chal.usb.ac.ir/article_2036_ddadeb1a5d716ec182eb9e7e1c2361f5.pdf

University of Sistan and Baluchestan, Iranian Society Of Mechanical Engineers Challenges in Nano and Micro Scale Science and Technology 2821-000X 3 2 2015 06 30 Solution Combustion Preparation Of Nano-Al2O3: Synthesis and Characterization 100 105 2037 10.7508/tpnms.2015.02.004 EN M. Farahmandjou Department of Physics, Varamin Pishva Branch, Islamis Azad University, Varamin, I.R. Iran N. Golabiyan Department of Physics, Varamin Pishva Branch, Islamis Azad University, Varamin, I.R. Iran Journal Article 2015 01 18 The aluminum oxide materials are widely used in ceramics, refractories and abrasives due to their hardness, chemical inertness, high melting point, non-volatility and resistance to oxidation and corrosion. The paper describes work done on synthesis of α-alumina by using the simple, non-expensive solution combustion method using glycine as fuel.Aluminum oxide (Al₂O₃₎ nanoparticles were synthesized by aluminum nitrate 9-hydrate as precursor and glycine as fuel. The samples were characterized by high resolution transmission electron microscopy (HRTEM), field effect scanning electron microscopy (FESEM), X-ray diffraction (XRD) and electron dispersive spectroscopy (EDS). As there are many forms of transition aluminas produced during this process, x-ray diffraction (XRD) technique was used to identify α-alumina. The diameter of sphere-like as-prepared nanoparticles was about 10 nm as estimated by XRD technique and direct HRTEM observation. The surface morphological studies from SEM depicted the size of alumina decreases with increasing annealing temperature. Absorbance peak of UV-Vis spectrum showed the small bandgap energy of 2.65 ev and the bandgap energy increased with increasing annealing temperature because of reducing the size. https://chal.usb.ac.ir/article_2037_df988229ad0d87cbfe2f408fca2d56b7.pdf

University of Sistan and Baluchestan, Iranian Society Of Mechanical Engineers Challenges in Nano and Micro Scale Science and Technology 2821-000X 3 2 2015 06 30 Turbulent Mixed Convection of a Nanofluid in a Horizontal Circular Tube with Non-Uniform Wall Heat Flux Using a Two-Phase Approach 106 117 2038 10.7508/tpnms.2015.02.005 EN F. Vahidinia Mechanical Engineering Department, University of Zabol, Zabol, I.R. Iran M. Rahmdel Mechanical Engineering Department, University of Sistan and Baluchestan, Zahedan, I.R.Iran Journal Article 2014 11 14 In this paper, Turbulent mixed convective heat transfer of water and Al₂O₃ nanofluid has been numerically studied in a horizontal tube under non-uniform heat flux on the upper wall and insulation in the lower wall using mixture model. For the discretization of governing equations, the second-order upstream difference scheme and finite volume method were used. The coupling of pressure and velocity was established by using SIMPLEC algorithm. The calculated results demonstrated that the convective heat transfer coefficient of nanofluid is higher than of the base fluid and by increasing the nanoparticles volume fraction, the convective heat transfer coefficient and shear stress on the wall increase. On the other hand, with increasing the Grashof number, the shear stress and convective heat transfer coefficient decrease. https://chal.usb.ac.ir/article_2038_5ad7b27c5b728e1a8b956d8aaad24717.pdf

University of Sistan and Baluchestan, Iranian Society Of Mechanical Engineers Challenges in Nano and Micro Scale Science and Technology 2821-000X 3 2 2015 06 30 Experimental Investigation on Heat Transfer of Silver-Oil Nanofluid in Concentric Annular Tube 118 128 2039 10.7508/tpnms.2015.02.006 EN H. Aberoumand Department of Mechanical Engineering, College of Engineering Takestan branch, Islamic Azad University, Talestan, I.R. Iran A. Jahani Mechanical Engineering Department, Islamic Azad University of Behbahan, Behbahan, I.R. Iran S. Aberoumand Department of Mechanical Engineering, College of Engineering Takestan branch, Islamic Azad University, Talestan, I.R. Iran A. Jafarimoghaddam Aerospace Engineering Department, University of K. N. Toosi Technology, Tehran I.R. Iran Journal Article 2014 04 22 In order to examine the laminar convective heat transfer of nanofluid, experiments carried out using silver-oil nanofluid in a concentric annulus with outer constant heat flux as boundary condition. Silver-oil nanofluid prepared by Electrical Explosion of Wire technique and observed no nanoparticles agglomeration during nanofluid preparation process and carried out experiments. The average size of particles established to 20 nm. Nanofluids with various particle weight fractions of 0.12%wt., 0.36%wt. and 0.72%wt. were employed. The nanofluid flowing between the tubes is heated by an electrical heating coil wrapped around it. The effects of different parameters such as flow Reynolds number, diameter ratio and nanofluid particle concentration on heat transfer coefficient are studied. Results show that, heat transfer coefficient  and Nusselt number increased by using naanofluid instead of pure oil. Maximum enhancement of heat transfer coefficient occurs in 0.72% wt. also results indicate that heat transfer coefficient  increase slightly by using low wt. concentration of nanofluids. https://chal.usb.ac.ir/article_2039_c0704567133f157fdd391a1120bcf3a6.pdf

University of Sistan and Baluchestan, Iranian Society Of Mechanical Engineers Challenges in Nano and Micro Scale Science and Technology 2821-000X 3 2 2015 06 30 Synthesis and Characterization of a New Halomercurate Nanoparticles: Triphenylphosphonium Trichloromercurate (II) [P (C6H5)3H]+[Hgcl3]- 129 134 2040 10.7508/tpnms.2015.02.007 EN Sh. Ghamami Department of Chemistry, Faculty of Science, Imam Khomeini International University, Qazvin, I.R. Iran R. Ghahremani Gavineh Roudi Department of Chemistry, Faculty of Science, Imam Khomeini International University, Qazvin, I.R. Iran S. Kazem Zadeh Anari Department of Chemistry, Faculty of Science, Imam Khomeini International University, Qazvin, I.R. Iran Journal Article 2014 12 20 That particles are of less than 100nm in diameter called nano particles (NPS) and there are in the world naturally like volcanic activity. In the present investigation a new mixed halomercurate nano particle compound was synthesised and characterized. Triphenylphosphonium trichloromercorate (II) [P(C₆H₅)₃H]⁺[HgCl₃]^-nanoparticle was synthesi -zed by using triphenylphosphonium chloride reaction with HgCl₂,in the presence of  trimercaptopropionic acid. This method is a simple and direct method. The product was characterized by spectroscopic and analytical methods such as ³¹P-NMR, scanning electron microscopy (SEM), infrared spectroscopy (IR) and also size of nanoparticles were calculated by X-ray diffraction (XRD). Average particles size of nano is showed about 89.83 nm Theoretical calculations were applied for the structural optimization of this compound. The structure of compound has been calculated and optimized by the density functional theory (DFT) based method at B3LYP/6-311G levels of theory, using the Gaussian 09 package of programs. Finally, the comparison between theory and experiments are done. https://chal.usb.ac.ir/article_2040_2ac7c843dec935e02e62a1bc72612690.pdf