Thermal and hydraulic characteristics of turbulent nanofluids flow in a rib–groove channel

Mohammed, Hussein A.; Al-Shamani, Ali Najah; Sheriff, Jamaluddin Md.

doi:10.1016/j.icheatmasstransfer.2012.10.020

Cited by 98 publications

(41 citation statements)

References 36 publications

(43 reference statements)

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“…Many studies have been carried out on channels provided with grooves [21][22][23][24], and geometries with obstructions, more similar to the profiled membranes, applied for passive micromixers [25][26][27][28][29] Moreover, several papers can be found in the literature on hydrodynamics and heat transfer predictions via Computational Fluid Dynamics (CFD) in corrugated channels, mainly with reference to heat exchangers [30][31][32][33][34], but very few woks have been devoted to mass transfer phenomena in such geometries. Zhang [35] carried out CFD modelling of fluid flow and mass transfer in a crosscorrugated triangular duct by simulating water vapour transport in dry air; correlations of friction factor and Sherwood number with the Reynolds number were proposed.…”

Section: Introduction and Literature Reviewmentioning

confidence: 99%

CFD modelling of profiled-membrane channels for reverse electrodialysis

Gurreri

Ciofalo

Cipollina

et al. 2015

Desalination and Water Treatment

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Reverse Electrodialysis (RE) is a promising technology for electric power generation from controlled mixing of two differently concentrated salt solutions, where ion exchange membranes are adopted for the generation of ionic currents within the system. Channel geometry strongly influences fluid flow and thus crucial phenomena such as pressure drop and concentration polarization. Profiled membranes are an alternative to the more commonly adopted net spacers and offer a number of advantages: avoiding the use of non-conductive and relatively expensive materials, reducing hydraulic losses and increasing the active membrane area.In this work, Computational Fluid Dynamic (CFD) simulations were performed to predict the fluid flow and mass transfer behaviour in channels with profiled membranes for RE applications. In particular, channels equipped with pillars were simulated. The influence of channel geometry on fluid flow and concentration polarization was assessed by means of a parametric analysis for different 2 profile geometries. The Unit Cell approach along with periodic boundary conditions was adopted to simulate fully developed boundary conditions. Transport equations, valid also for concentrated solutions, were obtained from the rigorous Stefan-Maxwell equation along with the assumptions of binary electrolyte and local electroneutrality. Simulation results show that in the geometries investigated here the pumping power consumption is much lower than in a conventional net spacer and very close to that of the empty channel, while calm zones are generated by the profiles, which may accentuate polarization phenomena.

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Section: Introduction and Literature Reviewmentioning

confidence: 99%

CFD modelling of profiled-membrane channels for reverse electrodialysis

Gurreri

Ciofalo

Cipollina

et al. 2015

Desalination and Water Treatment

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“…It was also noted that thermal conductivity increases with particles volume fraction but it decreases with the elapsed time. Mohammed et al [10] investigated thermal and hydraulic characteristics of turbulent nanofluids flow in a rib-groove channel. The results indicated that the rectangular rib-triangular groove has the highest Nusselt number among other rib-groove shapes.…”

Section: Introductionmentioning

confidence: 99%

Enhancement heat transfer characteristics in the channel with Trapezoidal rib–groove using nanofluids

Al-Shamani

Sopian

Mohammed

et al. 2015

Case Studies in Thermal Engineering

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a b s t r a c tNumerical study of heat transfer due to turbulent flow of nanofluids through rib-groove channel have been investigated. The continuity, momentum and energy equations are solved by the finite volume method (FVM). Four different rib-groove shapes have been examined. Four different types of nanoparticles, Al 2 O 3 , CuO, SiO 2 , and ZnO with different volumes fractions in the range of 1-4% and different nanoparticle diameter in the range of 25-70 nm, have been also studied. The computations are performed under constant temperature over a range of Reynolds number (Re) 10,000-40,000. Results indicate that the Trapezoidal with increasing height in the flow direction rib-trapezoidal groove has the best heat transfer rate and high Nusselt number. It is also found that the SiO 2 -nanofluid has the highest value of Nusselt number in comparison with the other type of nanofluids. The Nusselt number increases as the volume fraction increases and it decreases as the nanoparticle diameter increases. The present study shows that these Trapezoidal rib-groove using nanofluids have the potential to dramatically increase heat transfer characteristics and thus can be good candidates for the development of efficient heat exchanger device.

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“…Thermo-physical properties of water and nanoparticles [18]. The density and heat capacity are calculated as stated by Ghasemi and Aminossadati [19] as shown in equation (16) and (17):…”

Section: Tablementioning

confidence: 99%