Nanofluid Heat Transfer in Wavy-Wall Channels with Different Geometries: A Finite-Volume Lattice Boltzmann Study

Ilio, Giovanni Di; Ubertini, Stefano; Succi, Sauro; Falcucci, Giacomo

doi:10.1007/s10915-020-01234-9

Cited by 15 publications

(4 citation statements)

References 63 publications

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“…According to the results of their simulation, the friction factor and heat transfer rate are raised as the number of nanoparticles and helically twisted tapes increases. Ilio et al (2020) carried out an in-depth numerical analysis of the heat transfer features of nanofluid laminar flows in a wavy-wall pipe. According to their results, using nanofluids in the wavy-wall channel with large wave amplitude may lead to an optimal solution to increase the thermal performance of heat transfer devices.…”

Section: Heat Transfer and Thermal Efficiencymentioning

confidence: 99%

Heat transfer and thermal efficiency enhancement using twisted tapes in sinusoidal wavy tubes with nanofluids: a numerical study

Abbaszadeh,

Montazeri,

Mirzaie

2023

HFF

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Purpose The purpose of the study is to propose a novel implementation of twisted tape in sinusoidal wavy-walled tubes to enhance the rate of heat transfer without compromising thermal efficiency. The study numerically investigates the fluid flow characteristics and analyzes the effect of different geometrical configurations, including wall wave amplitude, tape twist angles and nanoparticle volume fractions, on heat transfer improvement and performance factor. Design/methodology/approach This problem is numerically investigated using computational fluid dynamics, and the method is the finite volume method. A two-phase mixture model is used for nanofluid modeling. Findings The study investigated the effect of wall waviness, twisted tape, and nanoparticles on forced convective heat transfer and friction factor behavior in laminar pipe flow in three different Reynolds number regimes. The results showed that implementing twisted tape in wavy tubes significantly increased the rate of heat transfer and the performance factor, with the best twist ratio between 90 and 180°. Adding nanoparticles also enhanced heat transfer and performance factor, but to a lesser extent than wavy wall-twisted tape combinations. The study suggests selecting a proper combination of wavy wall and twisted tape at each Reynolds number to achieve an optimum solution. Originality/value To the best of the authors’ knowledge, the implementation of the selected passive methods in sinusoidal wavy tubes has not been studied before, and no previous studies have taken into account such a mix of heat transfer improvement techniques.

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Section: Heat Transfer and Thermal Efficiencymentioning

confidence: 99%

Heat transfer and thermal efficiency enhancement using twisted tapes in sinusoidal wavy tubes with nanofluids: a numerical study

Abbaszadeh,

Montazeri,

Mirzaie

2023

HFF

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“…To implement such adiabatic conditions, at least two methods can be retrieved from the literature [37,41]: a (thermal) free-slip wall and an equilibrium condition. While the first one can be immediately recognized as a strightforward adiabatic condition, the second one can provide accurate results, provided that the thermal gradients (both in time and space) are small compared to the characteristic space and time scales of the problem under investigation [41].…”

Section: D Stefan Problemmentioning

confidence: 99%

Optimized Modeling and Design of a PCM-Enhanced H2 Storage

Facci

Lauricella²,

Succi

et al. 2021

Energies

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Thermal and mechanical energy storage is pivotal for the effective exploitation of renewable energy sources, thus fostering the transition to a sustainable economy. Hydrogen-based systems are among the most promising solutions for electrical energy storage. However, several technical and economic barriers (e.g., high costs, low energy and power density, advanced material requirements) still hinder the diffusion of such solutions. Similarly, the realization of latent heat storages through phase change materials is particularly attractive because it provides high energy density in addition to allowing for the storage of the heat of fusion at a (nearly) constant temperature. In this paper, we posit the challenge to couple a metal hydride H2 canister with a latent heat storage, in order to improve the overall power density and realize a passive control of the system temperature. A highly flexible numerical solver based on a hybrid Lattice Boltzmann Phase-Field (LB-PF) algorithm is developed to assist the design of the hybrid PCM-MH tank by studying the melting and solidification processes of paraffin-like materials. The present approach is used to model the storage of the heat released by the hydride during the H2 loading process in a phase change material (PCM). The results in terms of Nusselt numbers are used to design an enhanced metal-hydride storage for H2-based energy systems, relevant for a reliable and cost-effective “Hydrogen Economy”. The application of the developed numerical model to the case study demonstrates the feasibility of the posited design. Specifically, the phase change material application significantly increases the heat flux at the metal hydride surface, thus improving the overall system power density.

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“…Particle‐particle/wall interactions and the nature of the fluid that drives the motion of the immersed body are two general and significant factors, which have an important impact on the problem of particle‐laden flows. Of all the methods hired for simulating fluid flow and particulate flow, the combination of lattice Boltzmann method (LBM) 5,6 and immersed boundary method (IBM), 7 known as immersed boundary‐lattice Boltzmann method (IB‐LBM) has shown promising results 8,9 . This is a good candidate for weakly compressible flows, that is, low Mach number, and so for flows containing particles 10–13 .…”

Section: Introductionmentioning

confidence: 99%

Coupling immersed boundary and lattice Boltzmann method for modeling multi‐body interactions subjected to pulsatile flow

Karimnejad

Delouei

2022

Math Methods in App Sciences

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This paper numerically investigates the effect of pulsating flow on the settling dynamics of rigid circular particles. This is an interdisciplinary subject and spans several areas ranging from mathematical and numerical modeling to fluid mechanics. For this purpose, pulsatile flow characteristics are embedded in the combination of the direct‐forcing immersed boundary method and the split‐forcing lattice Boltzmann method. Inter‐collision forces between the solid boundaries (particles and boundaries) and the added mass force due to acceleration are considered. Adequate verification tests are done to ensure the credibility of the findings. The critical parameters of pulsating flow, such as amplitude and frequency of pulsation, are investigated in detail. The paper especially puts emphasis on the interaction between particles and studies the well‐known drafting, kissing, and tumbling (DKT) phenomena. Two different scenarios are taken into account and also compared with the stationary flow. The first case is when the pulsating flow is in the direction of gravity (co‐flow), while in the latter, there is an opposing flow (counterflow). The sedimentation manners of 12 particles in a vertical channel are also presented. The findings shed light on the importance of pulsating flow and the extension of the proposed computational method for such problems. It is also revealed that pulsation and its variables can alter DKT by either postponing or speeding up the process. Also, in some cases, the cycle of DKT can be maintained incompletely, and particles would just stick together. The results can be useful for various engineering problems like filtration and particle sorting.

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Nanofluid Heat Transfer in Wavy-Wall Channels with Different Geometries: A Finite-Volume Lattice Boltzmann Study

Cited by 15 publications

References 63 publications

Heat transfer and thermal efficiency enhancement using twisted tapes in sinusoidal wavy tubes with nanofluids: a numerical study

Heat transfer and thermal efficiency enhancement using twisted tapes in sinusoidal wavy tubes with nanofluids: a numerical study

Optimized Modeling and Design of a PCM-Enhanced H2 Storage

Coupling immersed boundary and lattice Boltzmann method for modeling multi‐body interactions subjected to pulsatile flow

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