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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Investigation of laminar fluid flow and heat transfer of nanofluid in trapezoidal microchannel with different aspect ratios
Hesam Bakhshi,Erfan Khodabandeh,Omidali Akbari,Davood Toghraie,Mohammad Joshaghani,Alireza Rahbari +5 more
TL;DR: In this paper, the effect of changes in geometric parameters, including internal and external dimensions on the behavior of heat transfer and fluid flow was studied by using of finite volume method, and an optimum ratio was presented.
Journal ArticleDOI
Numerical analysis on the thermal performance of microchannel heat sinks with Al2O3 nanofluid and various fins
TL;DR: In this paper, the hydraulic and thermal performance of microchannel heat sink configurations for high performance electronic cooling applications is investigated by numerical modeling, where the authors obtained conjugate heat transfer simulations through the silicon walls and the fluid domain of a square base prism heat sink traversed by 50 parallel rectangular cooling ducts, under a 150 W/cm2 constant heat flux input through the base.
Journal ArticleDOI
Numerical study of biomagnetic fluid flow in a duct with a constriction affected by a magnetic field
TL;DR: In this article, the influence of non-uniform magnetic field on biomagnetic fluid flow in a duct with a constriction is investigated numerically, where the magnetic field is generated by a wire carrying electric current located outside the duct.
Journal ArticleDOI
Benefits of spanwise gaps in cylindrical vortex generators for conjugate heat transfer enhancement in micro-channels
TL;DR: In this article, the authors examined the benefits of introducing various gaps along the length of the vortex generators, both for reducing pressure drop and improving the thermal conductance of the system, and demonstrated that having end gaps alone substantially improves heat transfer while reducing the pressure drop.
Journal ArticleDOI
Effects of external wind breakers of Heller dry cooling system in power plants
Ali Seifi,Omid Ali Akbari,Abdullah A.A.A. Al-Rashed,Fazel Afshary,Gholamreza Ahmadi Sheikh Shabani,Reza Seifi,Marjan Goodarzi,Farzad Pourfattah +7 more
TL;DR: In this paper, the dual and quadruple external breakers next to the cooling tower in different wind blow velocities have been examined and shown that by using wind breakers, the heat loss retrieves more for quadruple wind breaker, compared to the dual wind breaker.
References
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Numerical heat transfer and fluid flow
TL;DR: In this article, the authors focus on heat and mass transfer, fluid flow, chemical reaction, and other related processes that occur in engineering equipment, the natural environment, and living organisms.
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Two-equation eddy-viscosity turbulence models for engineering applications
TL;DR: In this paper, two new two-equation eddy-viscosity turbulence models are presented, which combine different elements of existing models that are considered superior to their alternatives.
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Hydrodynamic and heat transfer study of dispersed fluids with submicron metallic oxide particles
Bock Choon Pak,Young I. Cho +1 more
TL;DR: In this article, the authors used a Brookfield rotating viscometer to measure the viscosities of the dispersed fluids with γ-alumina (Al2O3) and titanium dioxide (TiO2) particles at a 10% volume concentration.
Journal ArticleDOI
Alteration of thermal conductivity and viscosity of liquid by dispersing ultra-fine particles. dispersion of al2o3, sio2 and tio2 ultra-fine particles
TL;DR: In this paper, the authors proposed a new algorithm called Al2O3, which is based on the SiO2-2-SiO3 algorithm, and showed that it is more efficient than SiO3 and TiO2.