Experimental investigation of the particle size effect on heat transfer coefficient of Al2O3 nanofluid in a cylindrical microchannel heat sink

Heidarshenas, Amir; Azizi, Zoha; Peyghambarzadeh, S.M.; Sayyahi, Soheil

doi:10.1007/s10973-019-09033-7

Cited by 14 publications

(10 citation statements)

References 48 publications

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“…As seen in Figure 11, Cu nanoparticles are Moreover, the percentage of the particle size frequency in Figure 12 shows that the size of most copper nanoparticles in OSC3 is less than 40 nm, while most nickel nanoparticles are in the range of 92−162 nm. It has been reported that 67,68 the size of nanoparticles has a significant effect on the heat transfer coefficient so that the smaller nanoparticles remarkably increase heat transfer. This can be caused by an increase in the surface area of the nanoparticles, which intensifies the random motion and collision between the nanoparticles and the fluid molecules.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Effect of Ligand Structure on the Kinetics of Heavy Oil Oxidation: Toward Biobased Oil-Soluble Catalytic Systems for Enhanced Oil Recovery

Farhadian

Khelkhal

Tajik

et al. 2021

Ind. Eng. Chem. Res.

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In recent years, protection of the environment from activities associated with enhanced oil recovery has been considered a crucial priority for decision-makers in the international community. The in situ combustion process as a promising thermal enhanced oil recovery method has been attracting considerable interest in terms of improving oil production and environmental protection. However, this technique is not yet well studied. This paper outlines a new approach to improve the process of heavy oil oxidation by designing new biobased oil-soluble catalysts that are able to maintain and stabilize the combustion flame front of the in situ combustion process. A comprehensive theoretical and experimental study including thermal analysis (thermogravimetry/differential scanning calorimetry, TG/DSC) and quantum calculations was used to shed light on the effect of the ligand structure in the oil-soluble catalytic system on the heavy oil oxidation process. The obtained accurate results proved that metal interaction with the designed ligands increased, which led to a decrease in the energy of activation and an increase in the heavy oil oxidation reaction rate. Besides, the obtained DSC curves showed one peak in the presence of Cu and biobased ligands, contrary to the curves obtained for heavy oil oxidation reported with other ligands and metals. In other words, the obtained catalysts merged low-temperature-and high-temperature oxidation regions into one region. These findings reveal that the structure of ligands can significantly affect their interaction with metals in oil-soluble catalysts, and therefore the efficiency of catalysts is dramatically improved. We believe that our work could be usefully employed for further studies to clarify the mechanism of the in situ combustion behavior of heavy oil for a better impact on the environment.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Effect of Ligand Structure on the Kinetics of Heavy Oil Oxidation: Toward Biobased Oil-Soluble Catalytic Systems for Enhanced Oil Recovery

Farhadian

Khelkhal

Tajik

et al. 2021

Ind. Eng. Chem. Res.

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“…The increase in heat transfer coefficient for both nanofluids was larger than the increase in thermal conductivity of the nanofluids, suggesting that other effects, such as particle migration or thermal dispersion, contribute to the increase in heat transfer coefficient as well. Heidarshenas et al [104] measured the heat transfer coefficient of Al 2 O 3 -water nanofluids containing nanoparticles with diameters of 20 nm, 50 nm, 80 nm, and 135 nm. The experiments were conducted using a micro channel with a length of 52 mm and a hydraulic diameter of 632 µm, and the nanofluids were at a concentration of 0.1 wt%.…”

Section: Effects Of Nanoparticle Size On the Heat Transfer Coefficientmentioning

confidence: 99%

Nanofluid Heat Transfer: Enhancement of the Heat Transfer Coefficient inside Microchannels

et al. 2022

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The purpose of this paper is to investigate the effects of a connector between two microchannels, for the first time. A brief literature review is provided to offer a better understanding on the impacts of concentration and the characteristics of nanoparticles on thermal conductivity, viscosity, and, consequently, the heat transfer coefficient inside the microchannels. The given literature review aims to help engineer nanofluids to enhance the heat transfer coefficient inside the microchannels. In this research, Fe₃O₄ nanoparticles were introduced into the base liquid to enhance the heat transfer coefficient inside the microchannels and to provide a better understanding of the impact of the connector between two microchannels. It was observed that the connector has a significant impact on enhancing the heat transfer coefficient inside the second microchannel, by increasing the level of randomness of molecules and particles prior to entering the second channel. The connector would act to refresh the memory of the fluid before entering the second channel, and as a result, the heat transfer coefficient in the second channel would start at a maximum value. Therefore, the overall heat transfer coefficient in both microchannels would increase for given conditions. The impacts of the Reynolds number and introducing nanoparticles in the base liquid on effects induced by the connector were investigated, suggesting that both factors play a significant role on the connector’s impact on the heat transfer coefficient.

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“…There are numerous research articles available in the literature 13–52 attributed to fluid flow and heat transfer characteristics of nanofluid in microchannels as well as MCHS. Vafaei and Wen 13,14 experimentally measured the effect of nanoparticle concentration (1-7vol.%) and volume flow rate (8-20ml/min) on fluid flow and heat transfer characteristics of Al2O3/water nanofluid in a circular microchannel (Di=510μm,t=160…”

Section: Introductionmentioning

confidence: 99%

“…Heidarshenas et al. 50 experimentally measured the effect of different nanoparticle size (20-135nm) and volume flow rate (1-2.33l/min) on fluid flow and heat transfer characteristics of Al2O3/water nanofluid in a cylindrical MCHS (Dh=632μm,L=52mm & N = 48) in the laminar flow regime. The results indicated that the maximum enhancements in pressure drop and average Nusselt number were achieved up to 7.7% and 22%, respectively, for Al2O3/water nanofluid with smallest particle size of 20nm as compared to DW.…”

Section: Introductionmentioning

confidence: 99%

“…Based upon the aforementioned research articles available in the literature, it was noticed that most of the research articles 13–52 performed parametric study on fluid flow and heat transfer characteristics of nanofluid in a microchannel as well as MCHS. However, correlations of friction factor and average Nusselt number of nanofluid were proposed in a few research articles 17,25,26,47,52 under specified fluid flow and heat transfer conditions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Single-phase fluid flow and heat transfer characteristics of nanofluid in a circular microchannel: Development of flow and heat transfer correlations

Lodhi

Sheorey

Dutta

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The convective heat transfer in microchannels with the use of nanofluids has proved to be a potential candidate for cooling of micro-electromechanical system devices. The current research article presents the experimental study on fluid flow and heat transfer characteristics of [Formula: see text]/water nanofluid in a microchannel under thermally developing laminar flow at Reynolds number ranging from 300 to 1000. The experimental set-up of a circular microchannel test section with an inner diameter of [Formula: see text] and length of [Formula: see text] is fabricated to conduct the experimental study. The effect of nanoparticle concentration ([Formula: see text]), Reynolds number ([Formula: see text]) on fluid flow and heat transfer characteristics of [Formula: see text]/water nanofluid have been measured and compared with that of distilled water (DW). The results indicate that the maximum enhancement in local heat transfer coefficient is achieved up to [Formula: see text], while friction factor is achieved up to [Formula: see text] for [Formula: see text]/water nanofluid with nanoparticle concentration of [Formula: see text] as compared to DW. The results showed that the performance evaluation criterion of [Formula: see text]/water nanofluid is greater than unity ([Formula: see text]), implying the benefits of nanofluids as compared to DW. Moreover, the predicted data obtained by the present proposed correlations for friction factor and local Nusselt number using [Formula: see text]/water nanofluid show reasonably good agreement with the deviations of [Formula: see text] and [Formula: see text], respectively, with the numerical data as compared to the predicted data obtained by the existing correlations available in the literature.

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Experimental investigation of the particle size effect on heat transfer coefficient of Al2O3 nanofluid in a cylindrical microchannel heat sink

Cited by 14 publications

References 48 publications

Effect of Ligand Structure on the Kinetics of Heavy Oil Oxidation: Toward Biobased Oil-Soluble Catalytic Systems for Enhanced Oil Recovery

Effect of Ligand Structure on the Kinetics of Heavy Oil Oxidation: Toward Biobased Oil-Soluble Catalytic Systems for Enhanced Oil Recovery

Nanofluid Heat Transfer: Enhancement of the Heat Transfer Coefficient inside Microchannels

Single-phase fluid flow and heat transfer characteristics of nanofluid in a circular microchannel: Development of flow and heat transfer correlations

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