Heat transfer in a closed cavity under conditions of forced vibrational convection

Ivanova, A. A.; Козлов, В. Г.; Polezhaev, Denis; Pareau, Dominique; Stambouli, Moncef

doi:10.1134/s0015462809040012

Cited by 3 publications

(3 citation statements)

References 6 publications

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“…An approach to deal with agitation in a reactor is based on the use of vibration-induced streaming. For instance, introducing vibrating activators in a chemical cell with a constant interface has demonstrated promising results based on a heat transfer study (Ivanova et al 2009).…”

Section: Introductionmentioning

confidence: 99%

Steady flow instability in an annulus with deflectors at rotational vibration

et al. 2016

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Experimental study and direct numerical simulation of dynamics of an isothermal low-viscosity fluid are done in a coaxial gap of a cylindrical container making rotational vibrations relative to its axis. On the inner surface of the outer wall of the container, semicircular deflectors are placed regularly, playing the role of flow activators. As a result of vibrations, the activators oscillate tangentially. In the simulation a two-dimensional configuration is considered, excluding the end-wall effects. In the experiment a container with large aspect ratio is used. Steady streaming is generated in the viscous boundary layers on the activators. On each of the latter, beyond the viscous domain, a symmetric vortices pair is formed. The steady streaming in the annulus has an azimuthal periodicity. With an increase in the vibration intensity, a competition between the vortices occurs, as a result of which one of the vortices (let us call it even) approaches the activator and the other one (odd) rolls away and couples with the vortices from the neighbouring pairs. Streamlines of the odd vortices close on each other, forming a flow of a cogwheel shape that encircles the inner wall. Comparison of the experiment and the simulation reveals an agreement at moderate vibration intensity.

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Section: Introductionmentioning

confidence: 99%

Steady flow instability in an annulus with deflectors at rotational vibration

et al. 2016

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“…Its hot junction (10) was put in a narrow groove in the heat exchanger, while the cold junction (11) was immersed in cooling water. e thermometers were connected to a multichannel measuring device Termodat 22K5 (12) (Figure 1(c)). Temperature was measured with an accuracy of 0.1°C.…”

Section: Experimental Setup and Techniquementioning

confidence: 99%

“…e aim of the present study is to investigate the relation between steady streaming and heat and mass transfer. Previously, Ivanova et al [12] performed an original experiment where the steady streaming (or forced vibrational convection) was generated by an oscillating disk. ey showed that the vibrational mixing produces an efficient heat transfer and allows achievement of homogeneous temperature distribution in the fluid volume.…”

Section: Introductionmentioning

confidence: 99%

Vibrational Heat Transfer Intensification in an Annulus with a Deformable Boundary

Kozlov

2019

Shock and Vibration

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An experimental study is carried out on heat transfer in a horizontal liquid annulus at boundary oscillations. The inner boundary is formed by a copper rod that is heated using electric current. The outer boundary is made of an elastic silicone tube brought to oscillations by two electrodynamic vibrators situated symmetrically on the opposite sides. In the absence of vibrations, a classic natural convection is observed. Vibrations excite steady time-average flows in the fluid. The steady flows make the gravity-induced flow structure transform, and the heat transfer is intensified. In the analysis, it is shown that the heat transfer in the studied system is determined by a competition between the natural convection and steady streaming. A domain of parameters is found where the latter dominates.

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Heat Transfer by Steady Streaming in a Horizontal Annulus with Inner Heating at Boundary Vibration

Kozlov

2019

IOP Conf. Ser.: Mater. Sci. Eng.

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Convection and heat transfer are studied experimentally in a horizontal annulus, the outer wall of which is formed by an elastic silicone tube, and the inner one – by a copper cylindrical heat exchanger. The working volume is filled with a viscous fluid. T he temperature of the outer boundary is kept constant. At the inner boundary, a constant heat generation power is maintained. The elastic outer wall is driven in a periodic motion by two linear motors, installed symmetrically to the left and to the right of the container and performing synchronous oscillations. Thermal measurements are carried out at steady state temperature. In the absence of vibrations, free convection is observed. Vibrations lead to the generation of steady averaged flows in the form of a system of eight pairs of rolls, parallel to the cylinder axis. Vibrational convection enhances heat transfer across the annulus. The structure of steady flows and the rate of heat transfer are determined by the interaction between two convective mechanisms.

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Heat transfer in a closed cavity under conditions of forced vibrational convection

Cited by 3 publications

References 6 publications

Steady flow instability in an annulus with deflectors at rotational vibration

Steady flow instability in an annulus with deflectors at rotational vibration

Vibrational Heat Transfer Intensification in an Annulus with a Deformable Boundary

Heat Transfer by Steady Streaming in a Horizontal Annulus with Inner Heating at Boundary Vibration

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