Journal ArticleDOI
Influence of T-semi attached rib on turbulent flow and heat transfer parameters of a silver-water nanofluid with different volume fractions in a three-dimensional trapezoidal microchannel
Habibollah Alipour,Arash Karimipour,Mohammad Reza Safaei,Davood Toghraie Semiromi,Omid Ali Akbari +4 more
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In this paper, the influence of T-semi attached rib on the turbulent flow and heat transfer parameters of a silver-water nanofluid with different volume fractions in a three-dimensional trapezoidal microchannel was explored.Abstract:
This study aimed at exploring influence of T-semi attached rib on the turbulent flow and heat transfer parameters of a silver-water nanofluid with different volume fractions in a three-dimensional trapezoidal microchannel. For this purpose, convection heat transfer of the silver-water nanofluid in a ribbed microchannel was numerically studied under a constant heat flux on upper and lower walls as well as isolated side walls. Calculations were done for a range of Reynolds numbers between 10,000 and 16,000, and in four different sorts of serrations with proportion of rib width to hole of serration width (R/W). The results of this research are presented as the coefficient of friction, Nusselt number, heat transfer coefficient and thermal efficiency, four different R/W microchannels. The results of numerical modeling showed that the fluid's convection heat transfer coefficient is increased as the Reynolds number and volume fraction of solid nanoparticle are increased. For R/W=0.5, it was also maximum for all the volume fractions of nanoparticle and different Reynolds numbers in comparison to other similar R/W situations. That's while friction coefficient, pressure drop and pumping power is maximum for serration with R/W=0 compared to other serration ratios which lead to decreased fluid-heat transfer performance.read more
Citations
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Heat transfer efficiency of Al2O3-MWCNT/thermal oil hybrid nanofluid as a cooling fluid in thermal and energy management applications: An experimental and theoretical investigation
Amin Asadi,Meisam Asadi,Alireza Rezaniakolaei,Lasse Rosendahl,Masoud Afrand,Somchai Wongwises +5 more
TL;DR: In this paper, the authors evaluated the heat transfer efficiency of Al2O3-MWCNT/thermal oil hybrid nanofluid over different temperatures (25-50°C) and solid concentrations (0.125% −1.5%).
Journal ArticleDOI
Investigation of turbulent heat transfer and nanofluid flow in a double pipe heat exchanger
Mohammad Hussein Bahmani,Ghanbar Ali Sheikhzadeh,Majid Zarringhalam,Omid Ali Akbari,Abdullah A.A.A. Al-Rashed,Gholamreza Ahmadi Sheikh Shabani,Marjan Goodarzi +6 more
TL;DR: In this paper, the effects of nanoparticles volume fraction, flow direction and Reynolds number on base fluid, nanofluid and wall temperatures, thermal efficiency, Nusselt number and convection heat transfer coefficient have been studied.
Journal ArticleDOI
Heat transfer improvement of water/single-wall carbon nanotubes (SWCNT) nanofluid in a novel design of a truncated double-layered microchannel heat sink
Ali Akbar Abbasian Arani,Omid Ali Akbari,Mohammad Reza Safaei,Ali Marzban,Abdullah A.A.A. Al-Rashed,Gholamreza Ahmadi,Truong Khang Nguyen +6 more
TL;DR: In this article, double layered micro-channel heat sink (MCHS) was used to transfer heat from nanofluid water/single-wall carbon nanotubes.
Journal ArticleDOI
A new correlation for predicting the thermal conductivity of ZnO–Ag (50%–50%)/water hybrid nanofluid: An experimental study
TL;DR: In this paper, the effect of volume fraction (0.125-2%) and temperature (25-50°C) on thermal conductivity of a hybrid nanofluid was examined.
Journal ArticleDOI
Developing a new correlation to estimate the thermal conductivity of MWCNT-CuO/water hybrid nanofluid via an experimental investigation
TL;DR: In this paper, the enhancement of thermal conductivities of water in the presence of copper oxide and multiwalled carbon nanotubes is investigated for the first time, and the results show that the thermal conductivity of the nanofluid increases at more solid concentration.
References
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Journal ArticleDOI
Effect of magnetic field on the heat transfer rate of kerosene/Fe2O3 nanofluid in a copper oscillating heat pipe
TL;DR: In this paper, the authors present the results of an experimental study on the use of Fe 2 O 3 /Kerosene nanofluid for the copper oscillating heat pipe under the magnetic field.
Journal ArticleDOI
Numerical simulation of laminar to turbulent nanofluid flow and heat transfer over a backward-facing step
Hussein Togun,Hussein Togun,Mohammad Reza Safaei,Rad Sadri,Salim Newaz Kazi,Ahmad Badarudin,Kamel Hooman,Emad Sadeghinezhad +7 more
TL;DR: The highest heat transfer augmentation in the present investigation was about 26% and 36% for turbulent and laminar range, respectively compared with pure water.
Journal ArticleDOI
Investigation of Micro- and Nanosized Particle Erosion in a 90° Pipe Bend Using a Two-Phase Discrete Phase Model
Mohammad Reza Safaei,Omid Mahian,Faroogh Garoosi,Kamel Hooman,Arash Karimipour,Salim Newaz Kazi,Samira Gharehkhani +6 more
TL;DR: Erosion prediction in 3-D, 90° elbow for two-phase (solid and liquid) turbulent flow with low volume fraction of copper with good agreement with earlier studies indicates that the erosion rate is directly dependent on particles' size and volume fraction as well as flow velocity.
Journal ArticleDOI
Comparison of the Finite Volume and Lattice Boltzmann Methods for Solving Natural Convection Heat Transfer Problems inside Cavities and Enclosures
Marjan Goodarzi,Mohammad Reza Safaei,Arash Karimipour,Kamel Hooman,Mahidzal Dahari,Salim Newaz Kazi,Emad Sadeghinezhad +6 more
Abstract: Different numerical methods have been implemented to simulate internal natural convection heat transfer and also to identify the most accurate and efficient one. A laterally heated square enclosure, filled with air, was studied. A FORTRAN code based on the lattice Boltzmann method (LBM) was developed for this purpose. The finite difference method was applied to discretize the LBM equations. Furthermore, for comparison purpose, the commercially available CFD package FLUENT, which uses finite volume Method (FVM), was also used to simulate the same problem. Different discretization schemes, being the first order upwind, second order upwind, power law, and QUICK, were used with the finite volume solver where the SIMPLE and SIMPLEC algorithms linked the velocity-pressure terms. The results were also compared with existing experimental and numerical data. It was observed that the finite volume method requires less CPU usage time and yields more accurate results compared to the LBM. It has been noted that the 1st order upwind/SIMPLEC combination converges comparatively quickly with a very high accuracy especially at the boundaries. Interestingly, all variants of FVM discretization/pressure-velocity linking methods lead to almost the same number of iterations to converge but higher-order schemes ask for longer iterations.
Journal ArticleDOI
Studying the Effect of Indentation on Flow Parameters and Slow Heat Transfer of Water-Silver Nano-Fluid with Varying Volume Fraction in a Rectangular Two-Dimensional Micro Channel
Arash Karimipour,Habibollah Alipour,Omid Ali Akbari,Davood Toghraie Semiromi,Mohammad Hemmat Esfe +4 more
TL;DR: In this article, the authors investigate the influence of indentations on the parameters of fluid flow and heat of water-silver nanofluid in a rectangular two-dimensional micro channel.