Effect of magnetic field on laminar forced convective heat transfer of MWCNT–Fe3O4/water hybrid nanofluid in a heated tube

Alsarraf, Jalal; Rahmani, Reza; Shahsavar, Amin; Afrand, Masoud; Wongwises, Somchai; Tran, Minh Duc

doi:10.1007/s10973-019-08078-y

Cited by 52 publications

(17 citation statements)

References 36 publications

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“…Retrospectively, researchers have adopted both passive and active techniques in order to modulate the boundary layer (2). Active heat transfer augmentation technique deals with direct control over the fluid interaction within the vicinity of the solid-liquid interface via external excitation method (3)(4)(5)(6). This method can be classified into two categories: active methods where the channel walls are fixed and active methods where the walls are moved by external forces (7).…”

Section: Introductionmentioning

confidence: 99%

Pipe Internal Grooving Using Closed Magnetic Field System: A Novel Method

Muhamad

Rony

Zubir

et al. 2021

Preprint

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The present work proposes an innovative method to form microgrooves on a tube internal surface through a new machining mechanism based on the principle of magnetic force for a greater flexibility and lower mechanical constraint. A newly designed machine equipped with a Magnetic Grooving Tool (MGT) was designed and fabricated for this purpose. The tool that consists of a pair of magnets is positioned in the pipe to be pulled by another pairing magnets set at the pipe external side. These four magnets are arranged in sequence of N-S-N-S direction so that it creates a closed magnetic field circuit which has a greater pulling force. By controlling the magnet pair at the pipe’s external side in the linear and rotational direction, the MGT is moved in both directions and simultaneously pulled towards the pipe surface to form the microgrooves. Experiment has been carried out by adjusting the internal and external magnets size combination and its distance to vary the magnetic strengths. The effect of magnetic pull force on the grooving dimension was examined by using an optical microscope and further analyzed using a 3D optical surface profile analyzer. The method was proven to capable of producing microgrooves on the internal surface of the copper pipe. The maximum groove depth of 75.55 μm was recorded by using the magnet size 10x10x40 mm and distance between magnet and workpiece of 2.5 mm.

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Section: Introductionmentioning

confidence: 99%

Pipe Internal Grooving Using Closed Magnetic Field System: A Novel Method

Muhamad

Rony

Zubir

et al. 2021

Preprint

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“…Hence, nano‐components of CNTs‐Fe 3 O 4 hybrid nanoliquid exhibit the achievements of drug delivery and cancer treatment for enhanced applicability in biomedicine and biotechnology. The heat transport characteristics of MWCNT‐Fe 3 O 4 /H 2 O hybrid nanoliquids have been analyzed by Sundar et al 64 Alsarraf et al 65 have presented a mathematical model to highlight the hydrothermal performance of water‐based magnetite MWCNTs in a heated tube under the influence of a nonuniform magnetic field. The non‐Newtonian hybrid nanoliquid flow conveying Fe 3 O 4 ‐coated CNTs in a double‐tube mini‐channel heat exchanger has been investigated by Bahiraei et al 66 Their results disclosed that at a high‐magnetite concentration, the entropy generation rate gets maximized with respect to the concentration of CNTs, whereas a minimizing trend is noted at a low magnetite concentration.…”

Section: Introductionmentioning

confidence: 99%

Radiative CNT‐based hybrid magneto‐nanoliquid flow over an extending curved surface with slippage and convective heating

Ali¹,

Jana

Das

2020

Heat Trans

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This study concentrates on the hydrothermal prominence of a mixed convective flow of a hybrid nanoliquid over a convectively heated extending curved surface under the influence of a uniform transverse magnetic field. Two types of carbon nanotubes (CNTs), namely single‐walled carbon nanotubes (SWCNTs) and multi‐walled carbon nanotubes (MWCNTs), and magnetite nanoparticles are dispersed in the host liquid (water) to simulate the hybrid nanoliquid flow model. First‐ and second‐order velocity slip conditions and nonlinear radiative heat flux are incorporated in this model. First, the system of governing partial differential equations is changed into nonlinear ordinary differential equations through the utilization of appropriate transformations and computed numerically via MATLAB built‐in function bvp4c based on the three‐stage Lobatto IIIA technique. The consequences of physical and geometrical parameters pertinent to this analysis on the dimensionless physical quantities of interest are deliberated using requisite graphs and tables. Our simulation communicates that the first‐order velocity slip parameter decreases the velocity profile, whereas the second‐order velocity slip parameter is found to be augmented. The suspension of CNTs in the magnetite nanoliquid improves the local surface drag force but diminishes the local heat flux. Moreover, it is examined that SWCNTs have greater impacts than MWCNTs.

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“…Numerous novel solutions have been proposed and implemented to enhance heat transfer in recent years [1][2][3][4][5]. Such solutions were aimed at reducing energy consumption and productivity improvement, e.g., the use of nanofluids [6][7][8][9][10][11][12][13][14][15], and more recently, the use of hybrid nanofluids [16][17][18][19][20][21][22][23][24][25][26] has been among the most successful ideas. However, the use of turbulators in the presence of hybrid nanofluids can provide different effectiveness, which is of significant interest to researchers.…”

Section: Introductionmentioning

confidence: 99%

Investigating the effects of different innovative turbulators on the turbulent flow field and heat transfer of a multi-phase hybrid nanofluid

Mahani

Ahmadi

Hezaveh

et al. 2020

J Therm Anal Calorim

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This study investigates the heat index by combining factors affecting the enhancement of heat transfer, including the modeling of three turbulators with 3D innovative geometries, hybrid nanofluid, including Cu and Al 2 O 3 , and high Reynolds numbers. Using the Eulerian method and the phase-coupled simple algorithm, a 3D tube in which turbulators with different sizes were embedded along with a hybrid nanofluid with a two-phase view were investigated. The geometry of rectangular turbulator is a = 1 cm, b = 3, 5, and 7 cm, and L = 40 cm, and geometry of twisted rectangular turbulator is like rectangular turbulator, and each part has a 5-cm length; also, the geometry of triangular turbulator is considered with b = 3, 5, and 7 cm, and L = 40 cm. In the two-phase view, because each phase can have a different velocity gradient and a different temperature gradient, the results were close to the experimental results. The results indicated that turbulators, hybrid nanofluid, and Reynolds number influenced heat transfer rate enhancement; for the rectangular turbulator, changing the turbulator size, volume fraction, and Reynolds number from the minimum values to the maximum values increased heat transfer by 49.17%. The same conditions increased heat transfer for the twisted rectangular and triangular turbulators by 44.28% and 45.19%, respectively. The proposed factors are practical and can be beneficial in heat transfer and fluid mechanics. Overall, at minimum conditions Re = 15,000 and φ = 0% up to maximum conditions Re = 25,000 and φ = 4% for rectangular, twisted rectangular, and triangular turbulators increasing heat transfer rates of 79.49%, 97.5%, and 82.45% have been observed, respectively.

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Effect of magnetic field on laminar forced convective heat transfer of MWCNT–Fe3O4/water hybrid nanofluid in a heated tube

Cited by 52 publications

References 36 publications

Pipe Internal Grooving Using Closed Magnetic Field System: A Novel Method

Pipe Internal Grooving Using Closed Magnetic Field System: A Novel Method

Radiative CNT‐based hybrid magneto‐nanoliquid flow over an extending curved surface with slippage and convective heating

Investigating the effects of different innovative turbulators on the turbulent flow field and heat transfer of a multi-phase hybrid nanofluid

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