Experimental study on the flow regimes past a confined prism undergoing self-sustained oscillations

Reyes, M.; Velázquez, A.; Arias, J.R.; Martín, Elena

doi:10.1016/j.ijheatfluidflow.2015.05.006

Cited by 7 publications

(11 citation statements)

References 36 publications

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“…For the lowest Reynolds number investigated (Re¼50) and the same channel-to-square width ratio than here, the critical density ratio was around 0.1. It is worth also remarking the work done by Reyes et al (2015), where the self-sustained oscillations of a square cylinder confined in channel were investigated at Reynolds numbers (based on the square width, too) ranging between 100 and 700, because they used the same channel-to-square width ratio than in the present study. For each Reynolds number they found a critical density ratio for which different oscillation regimes were found, going from no square motion at all (at Re¼100), to vibration around the equilibrium position with either the typical von Kármán streets downstream (at Re¼300) or with a chaotic wake (at Re ¼ 700).…”

Section: Introductionmentioning

confidence: 97%

“…For each Reynolds number they found a critical density ratio for which different oscillation regimes were found, going from no square motion at all (at Re¼100), to vibration around the equilibrium position with either the typical von Kármán streets downstream (at Re¼300) or with a chaotic wake (at Re ¼ 700). However, when these Reynolds numbers used in Sánchez-Sanz and Velazquez (2009) and Reyes et al (2015) are re-calculated and based on the channel width, as it is in micromixing devices, they are higher than the typical micromixing Reynolds numbers, since the later are very small , usually lower than 100. Due to this, the VIV mixing mechanism seems not to be adequate for micromixing.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing mixing at a very low Reynolds number by a heaving square cylinder

Ortega-Casanova

2016

Journal of Fluids and Structures

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Enhancing mixing at a very low Reynolds number by a heaving square cylinder

Ortega-Casanova

2016

Journal of Fluids and Structures

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“…al. [54] the same problem is addressed with a crucial difference: in this case the prism is left to oscillate self selfsustainedly by tethering it with thin cables to the channel walls, but still, inside an isothermal channel. Three different prism to water densities are tested (different buoyancy forces).…”

Section: The Confined Cylinder Problemmentioning

confidence: 99%

“…The main objective of this experiment was to determine if any of the possible flow topologies resulting from flow induced vibrations found in [54] were suitable to enhance mixing. To find it out, temperature was chosen as scalar to be traced.…”

Section: Flow Induced Vibration Mixing Enhancementmentioning

confidence: 99%

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Enhancing scalar transport in confined laminar flows

Matesanz¹

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Enhancing scalar transport in confined laminar flows by Francisco SASTRE MATESANZ Experimental research is carried out to shed light over the kind of some flow topologies and mechanisms that may enhance mixing in confined flows. The purpose is to understand said mechanisms to find suitable ways of optimization and application for the industry. A summary of results has been published in journals that appear in the Journal Citation Reports. Last but not least, I must mention that this path would have been highly untamed without the encouragement and spirit of my laboratory colleagues: Dr. David Vicente (strategy advisor), Dr. Ji Xu (code guru), César Enriquez (political advisor), Sergio Henriquez (human database), David Gutierrez (L A T E X consultant), Óscar Santiago (cultural provider), Rafel Clemente (expert in 3D printers), Eloy Millán (Galician sage), and others.

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Experimental study on heat transfer enhancement caused by the flow-induced vibration of a prism inside a channel

Sastre

Velázquez

2017

Applied Thermal Engineering

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An experimental study, using water as the working fluid, has been performed to analyze whether a passive system based on flow-induced vibration is a feasible option to enhance heat transfer in the laminar confined regime. The experimental setup consisted of a 1.5 m tall vertical channel manufactured on methacrylate (square cross-section of 25 mm x 25 mm) and a tethered square section buoyant prism (10 mm x 10 mm x 25 mm) placed inside the channel. The tethered prism was allowed to move freely (like an inverted pendulum) as a consequence of its interaction with the incoming flow. An aluminum block placed in the channel walls around the prism heated the water with a constant wall temperature of 60 C. The flow Reynolds number (Re) based on the prism cross section length was varied between 80 and 800. Three prisms with three different prism-to-water density ratios (m*) were used in the experiments: 0.56, 0.70 and 0.91. The case with the prism anchored to the walls was considered also. Regarding heat transfer, all cases were compared to the reference case which consisted of the clean channel with no prism present. The flow velocity was characterized using a Particle Image Velocimetry System. The electric power supply to the heated walls was recorded and the spatial distribution of water temperature was measured in a transversal plane downstream of the heated walls. It was found that the heat transfer enhancement provided by this system, as compared to the clean channel with no prism present, was very much dependent on Re. For example, at the lowest Re 80, the improvement on the Nusselt number (Nu) was negligible for all cases. At highest Re 800, the improvement on Nu was 100% for the case of prism-to-water density ratio of 0.91, and 66% for the case of the prism anchored to the walls. This suggests that, when thinking of practical engineering applications, passive systems based on flow-induced vibration might represent a feasible alternative, because of its simplicity, to active systems that require a more complex implementation that includes a motor to move the prism. The simplest setup (the prism anchored to the walls) also yields a significant, if smaller, heat transfer enhancement.

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Experimental study on the flow regimes past a confined prism undergoing self-sustained oscillations

Cited by 7 publications

References 36 publications

Enhancing mixing at a very low Reynolds number by a heaving square cylinder

Enhancing mixing at a very low Reynolds number by a heaving square cylinder

Enhancing scalar transport in confined laminar flows

Experimental study on heat transfer enhancement caused by the flow-induced vibration of a prism inside a channel

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