Heat transfer and associated energy dissipation for oscillatory flow in baffled tubes

Mackley, M. R.; Stonestreet, P.

doi:10.1016/0009-2509(95)00088-m

Cited by 190 publications

(179 citation statements)

References 11 publications

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“…Oscillatory flow reactors (OFRs) are a new generation of mixing equipment capable of delivering plug flow behaviour decoupled from the net flow [1] for applications in chemical and biological systems. Several key applications have been explored as a result of their unique ability to accommodate slow reactions in a reactor of length to diameter ratio a magnitude lower than conventional tubular plug flow reactors.…”

Section: Introductionmentioning

confidence: 99%

“…According to Baird and Stonestreet [9] a typical value of α is in the range of 0.2-0.4, but Ni et al [5] reported an optimal value of α = 0.20-0.22 (see Table 1). An energy dissipation and heat transfer study in OFRs used α = 0.34 [1] whilst α = 0.21 was used for a bioreactor application by Gaidhani et al [10]. Clearly, there appears to be no agreement in literature about the optimum value of α to be used, nevertheless from the fluid mechanics perspective smaller orifice diameter, d o constricts the fluid to a greater extent as it flows through each baffle resulting in wider vortex formation and more effective radial mixing conditions.…”

Section: Introductionmentioning

confidence: 99%

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A factorial approach to understanding the effect of inner geometry of baffled meso-scale tubes on solids suspension and axial dispersion in continuous, oscillatory liquid–solid plug flows

Ejim

Yerdelen

McGlone

et al. 2017

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A factorial approach to understanding the effect of inner geometry of baffled meso-scale tubes on solids suspension and axial dispersion in continuous, oscillatory liquid–solid plug flows

Ejim

Yerdelen

McGlone

et al. 2017

Chemical Engineering Journal

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“…By contrast, Habib et al [8] reported a complex non-monotonic relationship between the HTC and the frequency in pulsating pipe flow experiments with a constant heat flux boundary condition (B/C). Generally, previous studies can be classified into four groups, according to which flow pulsations can either: (i) enhance [9,10]; (ii) deteriorate [11]; (iii) have no effect on [12,13]; or (iv) have a complex effect (i.e. enhance or deteriorate) on heat transfer depending on the character of the flow [14,15].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer augmentation in unsteady conjugate thermal systems – Part II: Applications

Mathie

Nakamura

Markides

2013

International Journal of Heat and Mass Transfer

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Many energy conversion and other thermal-fluid systems exhibit unsteady convective heat exchange. In such systems, generic spatiotemporal variations in the flow give rise to variations in the heat flux for a given fluid-solid temperature difference, which can be interpreted as spatiotemporal fluctuations of the instantaneous heat transfer coefficient. These variations can lead to unsteady conjugate heat transfer, in which the exchanged heat flux arises from an interaction between the bulk fluid temperature and the temperature in the solid. Further, the nonlinear coupling between the fluctuating temperature differences and the heat transfer coefficient can lead to an effect we refer to as augmentation, which quantitatively describes the ability of a particular arrangement to have a different time-mean heat flux from the product between the mean heat transfer coefficient and the mean temperature difference across the fluid. It is important to be able to understand and to model in a simple framework the effects of the material properties, the geometry and the character of the heat transfer coefficient on the thermal response of the fluid-solid system, and consequently to predict the overall heat transfer performance of these systems. This paper, which follows on from its predecessor (Mathie and Markides, 2012a), is concerned with the phenomenon of augmentation in simple, one-dimensional, unsteady and conjugate fluid-solid systems. A simple semi-analytical one-dimensional model of heat transfer with a time-varying heat transfer coefficient, which was presented in Mathie and Markides (2012a), is applied herein to two different paradigm problems. Such a model can be an important tool in the design of improved heat exchangers and thermal insulation, through for example, the novel selection of materials to exploit these augmentation effects. The first flow considered is a thin, wavy fluid film flowing over a heated plate. This film flow exhibits a periodic fluctuation in the heat transfer coefficient, that is linked to the wavy interfacial deformations of free surface of the liquid film. The second flow considered concerns the heat transfer behind a backwards-facing step, which exhibits broadband fluctuations in the heat transfer coefficient due to the flow separation and turbulence behind * Corresponding author.

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“…Literature on the subject is rich and highlights the advantages of oscillatory flow reactors: effective droplet break-up and controlled droplet size in liquid-liquid dispersion [37], reduced dispersion [38] in baffled tubular reactors which leads to a plug flow behaviour by controlling the ratio of the oscillation intensity to the flow rate and last but not least, enhanced heat transfer [39]. Mackley et al studied the effects of both steady and oscillatory flow conditions on the heat transfer enhancement for a single phase fluid in a shell and tube heat exchanger containing periodic baffles.…”

Section: Oscillatory Flow Reactormentioning

confidence: 99%

Heat exchanger/reactors (HEX reactors): Concepts, technologies: State-of-the-art

Anxionnaz

Cabassud

Gourdon

et al. 2008

Chemical Engineering and Processing: Process Intensification

222

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a b s t r a c tProcess intensification is a chemical engineering field which has truly emerged in the past few years and is currently rapidly growing. It consists in looking for safer operating conditions, lower waste in terms of costs and energy and higher productivity; and a way to reach such objectives is to develop multifunctional devices such as heat exchanger/reactors for instance.This review is focused on the latter and makes a point on heat exchanger/reactors. After a brief presentation of requirements due to transposition from batch to continuous apparatuses, heat exchangers/reactors at industrial or pilot scales and their applications are described.

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Heat transfer and associated energy dissipation for oscillatory flow in baffled tubes

Cited by 190 publications

References 11 publications

A factorial approach to understanding the effect of inner geometry of baffled meso-scale tubes on solids suspension and axial dispersion in continuous, oscillatory liquid–solid plug flows

A factorial approach to understanding the effect of inner geometry of baffled meso-scale tubes on solids suspension and axial dispersion in continuous, oscillatory liquid–solid plug flows

Heat transfer augmentation in unsteady conjugate thermal systems – Part II: Applications

Heat exchanger/reactors (HEX reactors): Concepts, technologies: State-of-the-art

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