Heat generation in a Couette-Taylor flow multicylinder system

Mamonov, V. N.; Miskiv, N. B.; Назаров, А. Д.; Серов, А. Ф.; Терехов, В. И.

doi:10.1134/s0869864319050068

Cited by 7 publications

(12 citation statements)

References 2 publications

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“…This work continues the authors' research [1][2][3][4][5][6], presenting the results of experiments on the dependence of the power generated by such a heat generator on the relative angular velocity of rotation, the geometry of the proposed design and the viscosity of the working fluid. These experiments demonstrate that with a viscosity of the working fluid (6-25) • 10 -6 m 2 /s and with a relative rotational velocity of the rotors with a frequency of (4-5) Hz, the heat generator of the proposed design can reach a specific power that is significant for practical use (150-250) kW/m 3 .…”

Section: Introductionsupporting

confidence: 52%

“…3 (see table 1) Figure 3 gives the dependence of the specific power of the heat generator on the Reynolds number for a constant relative angular velocity of rotation of the rotors (Ω = 44 rad/s) with decreasing viscosity of the working fluid (with increasing temperature working fluid). The power released by the equivalent system is determined by the formula N = Ω•M [1,6]. Specific power is defined here as the power released by the heat generator, referred to the volume of the working fluid V, located in the annular gaps of the heat generator: In accordance with Figure 3, the power of the heat generator with an increase in the Reynolds number due to viscosity at a constant relative angular velocity of rotation of the rotors decreases according to the dependence close to hyperbola.…”

Section: Resultsmentioning

confidence: 99%

“…The height of the cylinders is 50 mm, and the diameter of the cylinders is from 198 to 302 mm. A detailed description of the experimental setup and the design of the heat generator is given in [6]. The rotors of the experimental setup could rotate at different relative velocities in opposite directions.…”

Section: Experimental Setup and Techniquementioning

confidence: 99%

See 2 more Smart Citations

Flow regimes in a multi-gap circular Couette-Taylor system with opposite rotating cylinders

Серов

Mamonov

Назаров

et al. 2021

J. Phys.: Conf. Ser.

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This work investigates the flow structure in the gaps of a multi-cylinder circular Couette-Taylor system, which is a model of a two-rotor heat generator. The initial information for studying the flow structure was data on the magnitude of the resistance torque to rotors opposed rotation, as well as on the nature of the amplitude-frequency spectrum of pulsations of this torque, depending on the viscosity of the working fluid and the rotational speed of the heat generator rotors. The obtained data allow comparing the nature of hydrodynamic processes in the single and obtained multi-gap circular space of Couette-Taylor and calculating the parameters of structural formations in the multi-gap working space of the heat generator. At relative rotational speeds of rotors (3-50) rad/s, the main energy of flow pulsations (up to 90%) is found in the amplitude-frequency spectra in the frequency range (12-70) Hz. It is associated with vortices first described by Taylor, which are extended low-frequency regularly alternating spirals and vortex structures with right and left rotation in the region of higher frequencies (200– 500) Hz; their frequency is determined by the width of the annular gaps of the multi-cylinder system.

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Section: Introductionsupporting

confidence: 52%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Flow regimes in a multi-gap circular Couette-Taylor system with opposite rotating cylinders

Серов

Mamonov

Назаров

et al. 2021

J. Phys.: Conf. Ser.

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“…The height of the WW is 400 mm, the diameter of the WW is 300 mm, and the width of the working blades is 75 mm. The used dynamometric system is described in detail in [6,7]. The dynamometer was calibrated in a static mode using exemplary weights.…”

Section: Experimental Setup Design and Techniquementioning

confidence: 99%

“…Structurally, the working part of the heat generator consists of two multi-cylinder rotors nested into each other and forming a system of annular coaxial channels. In such a device, heat is released in the volume of liquid located in narrow annular gaps between coaxial cylinders rotating towards each other (circular Couette-Taylor flow), which allows creation of effective heat sources [4][5][6][7]. The investigations carried out by the authors have shown that the specific thermal power released in a heat generator of such a design can reach values of the order of 1 MW/m 3 , which indicates the competitiveness of such devices among devices based on renewable energy sources.…”

Section: Introductionmentioning

confidence: 99%

Improving the efficiency of carousel wind turbine using aerodynamic shield

Серов

Mamonov

Назаров

et al. 2021

J. Phys.: Conf. Ser.

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The problem of increasing the efficiency of using the oncoming air flow for a wind wheel with a vertical axis of rotation, which is a mechanical drive of the wind heat generator, is considered. It is proposed to increase the efficiency of the device by installing an aerodynamic shield for the air flow oncoming the wind wheel. Such a shield is a cylindrical body in which a heat generator is placed. The shield creates an effect of confuser, leading to an increase in the speed and, consequently, in the kinetic energy of the air flow acting on the rotor blades. It is shown experimentally that the presence of an aerodynamic shield under the conditions of the experiments carried out at an incoming air flow velocity of ~ 1 m/s leads to a practical doubling of the wind wheel torque.

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State of the art of windthermal turbines: A systematic scoping review of direct wind-to-heat conversion technologies

Neumeier

Cöster

Pais

et al. 2021

Journal of Energy Resources Technology

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Windthermal turbines convert wind directly into thermal energy. Albeit it is an uncharted field of research, the overall system efficiency and costs of fully developed windthermal turbines are promising; since they can contribute to a sustainable energy transition. We identify the current state of the art of windthermal conversion principles, technology maturity, applications, substitutes, advantages and disadvantages. To scope relevant literature, we follow the Joanna Briggs Institutes selection and screening process resulting in 61 relevant publications from which we identified three main conversion types, namely compression-, friction-, and induction-based windthermal devices. These devices can directly supply thermal energy for space heating or industrial processes, work as a component of wind-powered thermal energy systems, short WTES, or can substitute any conventional or renewable heat device. Although heat is the lowest form of energy, windthermal applications could provide cheap renewable energy that can be stored easily enhancing security of supply. However, these technologies are currently on laboratory-scale, and we suggest scaling up the existing prototypes to engineering-scale. Finally, due to a missing general terminology, we propose to establish one of the terms windthermal energy, ventothermal energy or anemothermal energy to distinguish these specific wind energy conversion technologies.

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Heat generation in a Couette-Taylor flow multicylinder system

Cited by 7 publications

References 2 publications

Flow regimes in a multi-gap circular Couette-Taylor system with opposite rotating cylinders

Flow regimes in a multi-gap circular Couette-Taylor system with opposite rotating cylinders

Improving the efficiency of carousel wind turbine using aerodynamic shield

State of the art of windthermal turbines: A systematic scoping review of direct wind-to-heat conversion technologies

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