Turbulent combined forced and natural convection of nanofluid in a 3D rectangular channel using two-phase model approach

Esmaeili, Hossein; Armaghani, T.; Abedini, A.; Pop, Ioan

doi:10.1007/s10973-018-7471-9

Cited by 10 publications

(5 citation statements)

References 30 publications

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“…Some researchers focused on nanofluid flow through the absorber tube, which is essentially a channel. Esmaeili et al ( Esmaeili et al, 2019 ) applied a two-phase model to inspect turbulent flow with both forced and free convection of nanofluid within a 3D rectangular channel ( Ajeel Raheem et al, 2022 ). numerically analyzedthe flow pattern and heat transfer properties of ZnO-water nanofluid within a new channel, where both curved and corrugated profiles for the walls and E-shaped baffles.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of perforated obstacles effects on the performance of solar parabolic trough collector

et al. 2023

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The current work presents and discusses a numerical analysis of improving heat transmission in the receiver of a parabolic trough solar collector by introducing perforated barriers. While the proposed approach to enhance the collector’s performance is promising, the use of obstacles results in increased pressure loss. The Computational Fluid Dynamics (CFD) model analysis is conducted based on the renormalization-group (RNG) k-ɛ turbulent model associated with standard wall function using thermal oil D12 as working fluid The thermo-hydraulic analysis of the receiver tube with perforated obstacles is taken for various configurations and Reynolds number ranging from 18,860 to 81,728. The results are compared with that of the receiver without perforated obstacles. The receiver tube with three holes (PO3) showed better heat transfer characteristics. In addition, the Nusselt number (Nu) increases about 115% with the increase of friction factor 5–6.5 times and the performance evaluation criteria (PEC) changes from 1.22 to 1.24. The temperature of thermal oil fluid attains its maximum value at the exit, and higher temperatures (462.1 K) are found in the absorber tube with perforated obstacles with three holes (PO3). Accordingly, using perforated obstacles receiver for parabolic trough concentrator is highly recommended where significant enhancement of system’s performance is achieved.

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Section: Introductionmentioning

confidence: 99%

Numerical study of perforated obstacles effects on the performance of solar parabolic trough collector

et al. 2023

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“…In the electronics field, the most commonly utilized HT techniques for cooling are conduction and convection. There are three different types of convection for heat management on electronic devices: forced convection, natural convection, and mixed convection [45,46]. Peng et al [47] examined the forced-air convection for the battery TM system with mathematical modeling.…”

Section: Comparison Of Convection Heat Managementmentioning

confidence: 99%

A comprehensive review on thermal management of electronic devices

Dhumal,

Kulkarni,

Ambhore

2023

J. Eng. Appl. Sci.

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In the field of electronics thermal management (TM), there has already been a lot of work done to create cooling options that guarantee steady-state performance. However, electronic devices (EDs) are progressively utilized in applications that involve time-varying workloads. Therefore, the TM systems could dissipate the heat generated by EDs; however, there seemed to be a necessity for a design that would contain temperature rise within an acceptable range for limiting hot spots and managing thermal transients induced by higher-frequency operating cycles. Heat dissipation issues become more significant when miniaturization in electronics increases. More effective TM often results in enhanced reliability as well as a longer life expectancy for devices. Hence, this paper explicates the TM of EDs, the comparison of cooling methods, the comparison of convections for TM on EDs, the heat source (HS) mounted on the substrate board, and optimization techniques to optimize the size and position of HSs mounted on the substrate board. This paper also analyzes the TM technologies on different EDs from 2014 to 2023 and the comparison of the thermal conductance of EDs with two types of phase change materials (PCMs) and pin-fin heat pipes (HPs).

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“…The subscripts (f; p, and m) represent base uid, nanoparticles, and the mixture, respectively. Mixture mean velocity, viscosity, density and thermal conductivity are expressed as follows [56]:…”

Section: Two-phase Modelmentioning

confidence: 99%

Numerical study of using perforated conical turbulators and added nanoparticles to enhance heat transfer performance in heat exchangers

Farajollahi¹,

Mokhtari²,

Rostami³

et al. 2022

Scientia Iranica

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The current study investigates a two-phase turbulent nano uid ow inside a heat exchanger tube equipped with a novel type of conical turbulators having two parallel rows of holes for the rst time. The e ects of the number of the conical insert turbulators, number of the holes and volume fraction of the nanoparticles on ow eld, average Nusselt number, friction factor, and performance evaluation criterion have been numerically investigated. The results show that the proposed turbulators create vortices and recirculating currents that have signi cant e ect on heat transfer. As the number of the turbulators increases, Nusselt number increases obviously. However, the presence of holes reduces the friction factor and pressure drop that is related to lower resistance in the ow path. In general, the use of perforated conical turbulators improves Performance Evaluation Criterion (PEC) by creating controlled turbulent ows. On the other hand, the use of added nanoparticles also enhances heat transfer. The presented turbulators increase PEC by 43% compared to the smooth tube, if the parameters are determined properly. The maximum PEC of 1.43 is obtained at M = 8, N = 4, and Re = 4100, showing good performance compared to other types of turbulators.

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Turbulent combined forced and natural convection of nanofluid in a 3D rectangular channel using two-phase model approach

Cited by 10 publications

References 30 publications

Numerical study of perforated obstacles effects on the performance of solar parabolic trough collector

Numerical study of perforated obstacles effects on the performance of solar parabolic trough collector

A comprehensive review on thermal management of electronic devices

Numerical study of using perforated conical turbulators and added nanoparticles to enhance heat transfer performance in heat exchangers

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