Chaotic advection in steady laminar heat transfer simulations: Periodic zigzag channels with square cross-sections

Zheng, Zhanying; Fletcher, David F.; Haynes, Brian S.

doi:10.1016/j.ijheatmasstransfer.2012.10.029

Cited by 44 publications

(14 citation statements)

References 24 publications

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“…Subsequently, Zheng et al [7,8] extended the study to higher Reynolds numbers using a computational domain containing sufficient repeating units to achieve fully-developed conditions. They pointed out that with increasing Reynolds number, the spatially periodic flow patterns were no longer seen due to the existence of chaotic fluid particle trajectories.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study of transient behaviour of laminar flow in zigzag semi-circular microchannels

Dai

Zheng

Fletcher

et al. 2015

Experimental Thermal and Fluid Science

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Section: Introductionmentioning

confidence: 99%

“…They pointed out that with increasing Reynolds number, the spatially periodic flow patterns were no longer seen due to the existence of chaotic fluid particle trajectories. They demonstrated that chaotic advection was able to be generated in simple planar-based zigzag channels with square [8] and semi-circular crosssections [7].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of transient behaviour of laminar flow in zigzag semi-circular microchannels

Dai

Zheng

Fletcher

et al. 2015

Experimental Thermal and Fluid Science

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“…(4) and the reduced var-iance b 2 given by Eq. (7). The reduced variance b 2 is an important parameter for the evaluation of the fluctuation of residence time around the average value.…”

Section: Relation Between the Reduced Variance And The Poincaré Sectionsmentioning

confidence: 99%

“…They are mainly used in industrial homogenization operations, and are found in processes for food processing, cosmetics, pharmaceuticals, heat transfer, wastewater treatment, etc. Laminar flows are involved in a large number of high‐viscosity flow conditions, e.g., in the food industry and microscale systems , .…”

Section: Introductionmentioning

confidence: 99%

Effect of Reynolds Number on Laminar Mixing in an Annular Tube Combining Two Crossed Secondary Flows

2018

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To improve static and continuous mixers, several methods have been proposed in the literature. Herein, two well‐known passive intensification configurations were applied to an annular laminar flow and numerically studied. Residence time distributions (RTDs) and Poincaré sections were examined to investigate the dispersion of the particles. These two approaches show that geometric perturbations of the walls improve the mixing level for all Reynolds numbers investigated. Above Re = 300, the increase in mixing can be attributed to chaotic advection within the flow. Finally, a general reactor model that allows the RTD in the annular tube to be predicted with high confidence is proposed.

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“…A considerable amount of literature has been published on the CFD modeling of the heat transfer process in various types of apparatus, such as: pipelines with different geometry and shape (Han et al, 2012;Jayakumar et al, 2010;Rosaguti et al, 2006;Schietekat et al, 2014;Zheng et al, 2013), heat exchangers (Afrianto et al, 2014;Freund and Kabelac, 2010;Yataghene et al, 2009), mechanical mixers (Delaplace et al, 2001;Kougoulos et al, 2005) or static mixers (Habchi and Harion, 2014;Solano et al, 2012;Wang et al, 2011). There are also some studies concerning CFD simulations of heat transfer in nanofluids (Fard et al, 2010;Utomo et al, 2012), objects inserted in fluid flow (Defraeye et al, 2010;Zare and Hashemabadi, 2013) or heat exchange enhancement (Eesa and Barigou, 2010;van Goethem and Jelsma, 2014).…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamics and Experimental Studies of a New Mixing Element in a Static Mixer as a Heat Exchanger

Konopacki¹,

Kordas²,

Fijałkowski³

et al. 2015

Chemical and Process Engineering

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The main aim of this work is to study the thermal efficiency of a new type of a static mixer and to analyse the flow and temperature patterns and heat transfer efficiency. The measurements were carried out for the static mixer equipped with a new mixing insert. The heat transfer enhancement was determined by measuring the temperature profiles on each side of the heating pipe as well as the temperature field inside the static mixer. All experiments were carried out with varying operating parameters for four liquids: water, glycerol, transformer oil and an aqueous solution of molasses. Numerical CFD simulations were carried out using the two-equation turbulence k-ω model, provided by ANSYS Workbench 14.5 software. The proposed CFD model was validated by comparing the predicted numerical results against experimental thermal database obtained from the investigations. Local and global convective heat transfer coefficients and Nusselt numbers were detrmined. The relationship between heat transfer process and hydrodynamics in the static mixer was also presented. Moreover, a comparison of the thermal performance between the tested static mixer and a conventional empty tube was carried out. The relative enhancement of heat transfer was characterised by the rate of relative heat transfer intensification.

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Chaotic advection in steady laminar heat transfer simulations: Periodic zigzag channels with square cross-sections

Cited by 44 publications

References 24 publications

Experimental study of transient behaviour of laminar flow in zigzag semi-circular microchannels

Experimental study of transient behaviour of laminar flow in zigzag semi-circular microchannels

Effect of Reynolds Number on Laminar Mixing in an Annular Tube Combining Two Crossed Secondary Flows

Computational Fluid Dynamics and Experimental Studies of a New Mixing Element in a Static Mixer as a Heat Exchanger

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