Nanofluid flow through microchannel with a triangular corrugated wall: Heat transfer enhancement against entropy generation intensification

Nguyen, Quyen; Bahrami, Dariush; Kalbasi, Rasool; Bach, Quang‐Vu

doi:10.1002/mma.6705

Cited by 45 publications

(11 citation statements)

References 58 publications

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“…The local Nusselt number varies in a periodic way over the length of the microchannel and rises with the growth in the Reynold number, according to the findings. Nguyen et al [ 140 ] analyzed the impacts of the magnetic field in a slippery microchannel. Applying a magnetic field to the microchannel enhanced both slip velocity and temperature gradient close to the wall, according to the findings.…”

Section: Introduction To Microstructuresmentioning

confidence: 99%

A Review of the Methods of Modeling Multi-Phase Flows within Different Microchannels Shapes and Their Applications

et al. 2021

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In industrial processes, the microtechnology concept refers to the operation of small devices that integrate the elements of operational and reaction units to save energy and space. The advancement of knowledge in the field of microfluidics has resulted in fabricating devices with different applications in micro and nanoscales. Micro- and nano-devices can provide energy-efficient systems due to their high thermal performance. Fluid flow in microchannels and microstructures has been widely considered by researchers in the last two decades. In this paper, a review study on fluid flow within microstructures is performed. The present study aims to present the results obtained in previous studies on this type of system. First, different types of flows in microchannels are examined. The present article will then review previous articles and present a general summary in each section. Then, the multi-phase flows inside the microchannels are discussed, and the flows inside the micropumps, microturbines, and micromixers are evaluated. According to the literature review, it is found that the use of microstructures enhances energy efficiency. The results of previous investigations revealed that the use of nanofluids as a working fluid in microstructures improves energy efficiency. Previous studies have demonstrated special attention to the design aspects of microchannels and micro-devices compared to other design strategies to improve their performance. Finally, general concluding remarks are presented, and the existing challenges in the use of these devices and suggestions for future investigations are presented.

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Section: Introduction To Microstructuresmentioning

confidence: 99%

A Review of the Methods of Modeling Multi-Phase Flows within Different Microchannels Shapes and Their Applications

et al. 2021

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“…Also, they found that at higher Reyonlds number, the periodic flow could transition to nonperiodic or chaotic flow due to instabilities. Nguyen et al 22 numerically studied the nanofluid flow through a microchannel with triangular corrugated wall. The heat transfer is augmented due to the corrugation, which also significantly increases entropy generation caused by vortex generation, and this can be mitigated by applying a magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Computational analysis of the thermal performance of rarefied air flow in V‐shaped microchannels

et al. 2021

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In this study, a computational fluid analysis of a slip flow developing thermally and hydrodynamically in a triangular microchannel has been considered. The wall of the channel is preserved at a fixed temperature. Temperature jump and velocity slip boundary conditions are imposed on the surfaces. The microchannel is constructed from seven triangular‐shaped channels and the angle of the microchannel (θ) is varied from 0° to 40°. Simulations are carried out for 1 ≤ italicRe ≤ 8 , 0 ≤ italicKn ≤ 0.1, and the air is used as a working fluid with variable physical properties. The simulation results show that the triangular microchannel can improve heat transfer as compared with plain microchannels. An optimal θ of 20° is found to provide the best heat transfer at moderate frictional losses. Finally, correlations for the average Nusselt number and the average friction coefficient among all parameters are proposed as follows: trueNu ̅ = 4.015 Re 0.0255 Kn − 0.1 ( normalsin θ ) − 0.0479, trueC f ̅ = 3.71 Re − 1.218 italicKn − 0.296 ( normalsin θ ) − 0.495.

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“…Rising the mean Nu number and entropy generations in all Re numbers was a clear outcome of rising the percentage of nanofluid volume fraction. Nguyen et al (2020) used triangular ribs as vortex generators and hybrid nanofluids to increase the heat transfer. The outcomes of simulation claimed that the heat transfer can be achieved at higher nanofluids in the presence of triangular ribs.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, heat transfer increments with increasing Reynolds number and wingchord ratios. Nguyen et al (2020) and employed a wavy wall to make vortexes to improve heat transfer in a heat exchanger by hybrid nanofluids. According to their outputs, as the amplitude of wave rises, the strength of vortexes turns higher and results in more heat transfer.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Combined Turbulators on the Hydraulic-Thermal Performance and Exergy Efficiency of MWCNT-Cu/Water Nanofluid in a Parabolic Solar Collector: A Numerical Approach

2021

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The present research benefits from the finite volume method in investigating the influence of combined turbulators on the thermal and hydraulic exergy of a parabolic solar collector with two-phase hybrid MWCNT-Cu/water nanofluid. All parabolic geometries are produced using DesignModeler software. Furthermore, FLUENT software, equipped with a SIMPLER algorithm, is applied for analyzing the performance of thermal and hydraulic, and exergy efficiency. The Eulerian–Eulerian multiphase model and k-ε were opted for simulating the two-phase hybrid MWCNT-Cu/water nanofluid and turbulence model in the collector. The research was analyzed in torsion ratios from 1 to 4, Re numbers from 6,000 to 18,000 (turbulent flow), and the nanofluid volume fraction of 3%. The numerical outcomes confirm that the heat transfer and lowest pressure drop are relevant to the Re number of 18,000, nanofluid volume fraction of 3%, and torsion ratio of 4. Furthermore, in all torsion ratios, rising Re numbers and volume fraction lead to more exergy efficiency. The maximum value of 26.32% in the exergy efficiency was obtained at a volume fraction of 3% and a torsion ratio of 3, as the Re number goes from 60,000 to 18,000.

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Nanofluid flow through microchannel with a triangular corrugated wall: Heat transfer enhancement against entropy generation intensification

Cited by 45 publications

References 58 publications

A Review of the Methods of Modeling Multi-Phase Flows within Different Microchannels Shapes and Their Applications

A Review of the Methods of Modeling Multi-Phase Flows within Different Microchannels Shapes and Their Applications

Computational analysis of the thermal performance of rarefied air flow in V‐shaped microchannels

The Influence of Combined Turbulators on the Hydraulic-Thermal Performance and Exergy Efficiency of MWCNT-Cu/Water Nanofluid in a Parabolic Solar Collector: A Numerical Approach

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