Experimental study of the influence of the rows of vortex generators on turbulence structure in a tube

Mokrani, Adnane; Castelain, Cathy; Peerhossaini, Hassan

doi:10.1016/j.cep.2008.07.009

Cited by 29 publications

(18 citation statements)

References 31 publications

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“…Both intensified and inhomogeneous or anisotropic turbulent structures were observed [45]. Counter-rotating vortices behind the tabs were shown both by experiments and simulations [46][47][48]. An HEV static mixer enhanced heat transfer and mixing in chemical reactions in integrated chemical reactor-heat exchangers [46,49,50].…”

Section: Advances In Mechanical Engineeringmentioning

confidence: 99%

“…This significant enhancement of heat transfer was due to the HEV static mixer's disturbance to the drag reducing flow. As discussed in the introduction section, tabs in the HEV static mixer cause intensified turbulence and streamwise counter-rotating vortices behind the tabs near the wall [45][46][47][48]. The streamwise counter-rotating vortices bring the heated fluid near the wall to the axis of the flow, and at the same time, the wall region is replenished with cold fluid from the center of the bulk flow to receive heat from the wall.…”

Section: Heat Transfer Reduction Of Eo12/nasal (3 Mm/75 Mm)mentioning

confidence: 99%

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Enhancing Heat Transfer of Drag-Reducing Surfactant Solution by an HEV Static Mixer with Low Pressure Drop

Shi

Wang

et al. 2011

Advances in Mechanical Engineering

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A novel high-efficiency vortex (HEV) static mixer was used to locally enhance the heat transfer coefficient of a drag-reducing fluid, Ethoquad O/12 (EO12) (3 mM) with sodium salicylate (NaSal) (5 mM). Significant enhancement of heat transfer coefficients was observed. The Nusselt numbers were three to five times those of normal drag-reducing flow without mixer and were close to those of water at high Reynolds number with only modest energy penalty. In contrast, a Helix static mixer increased Nusselt number slightly with very high pressure loss. A performance number was used for comparisons among the HEV static mixer, the Helix static mixer, and water without mixer. The HEV static mixer had a performance number comparable to that of water. The enhanced heat transfer by the HEV static mixer resulted from streamwise vortices generated by the inclined tabs, which increased the convective heat transfer in the radial direction.

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Section: Advances In Mechanical Engineeringmentioning

confidence: 99%

Section: Heat Transfer Reduction Of Eo12/nasal (3 Mm/75 Mm)mentioning

confidence: 99%

Enhancing Heat Transfer of Drag-Reducing Surfactant Solution by an HEV Static Mixer with Low Pressure Drop

Shi

Wang

et al. 2011

Advances in Mechanical Engineering

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“…the periodic acceleration and deceleration of the flow in porous structures. Mokrani et al investigated the flow over vortex generators mounted in a pipe [17]. Mean and statistic quantities of the flow were measured using laser Doppler velocimetry.…”

Section: Literature Reviewmentioning

confidence: 99%

Dispersion in fully developed flow through regular porous structures: Experiments with wire-mesh sensors

Häfeli

Hutter

Damsohn

et al. 2013

Chemical Engineering and Processing: Process Intensification

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Within this study the wire-mesh sensor is proposed as a suitable device to investigate radial and axial dispersion in tubular reactors. Axial dispersion in turbulent flow through a regular highly porous structure is addressed and the effect of reactor length on the estimated axial dispersion coefficient is discussed. We state that the gradual increase of turbulence intensity in the entrance section of the porous structure is an effect which leads to a length dependence of the dispersion coefficient. Furthermore, we present measurements of radial mixing by the wire-mesh sensor and compare it to reference measurements using laser induced fluorescence. By that we discuss the possible bias from non-homogeneous tracer distribution between the electrodes. Despite the differences of the measurement principles we found a good qualitative agreement between the results.

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“…Longitudinal embedded vorticity is the main intensification factor in the HEV multifunctional heat exchanger, and its properties have been studied intensively in Mokrani et al [44], Mohand Kaci et al [45,46], Habchi et al [47,48], Ajak et al [49], and Toé et al [50]. The mixing mechanisms of the HEV static mixer suggest that its performance can be attributed to the simultaneity of heat transfer and droplet breakup, a considerable advantage in terms of energy cost and compactness.…”

Section: Discussionmentioning

confidence: 99%

Turbulent direct-contact heat transfer between two immiscible fluids

Lemenand¹,

Durandal²,

Valle³

et al. 2010

International Journal of Thermal Sciences

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Experimental study of the influence of the rows of vortex generators on turbulence structure in a tube

Cited by 29 publications

References 31 publications

Enhancing Heat Transfer of Drag-Reducing Surfactant Solution by an HEV Static Mixer with Low Pressure Drop

Enhancing Heat Transfer of Drag-Reducing Surfactant Solution by an HEV Static Mixer with Low Pressure Drop

Dispersion in fully developed flow through regular porous structures: Experiments with wire-mesh sensors

Turbulent direct-contact heat transfer between two immiscible fluids

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