Enhanced energy conversion as a result of fluid-solid interaction in micro- and nanoscale

Badur, Janusz; Ziółkowski, Paweł; Kornet, Sebastian; Kowalczyk, Tomasz; Banas, Kamil; Bryk, Mateusz; Ziółkowski, P.; Stajnke, Michał

doi:10.15632/jtam-pl.56.1.329

Cited by 16 publications

(10 citation statements)

References 19 publications

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“…The hydrodynamics of nanoscale fluid systems exhibit many peculiar behaviors comparing to that at the macroscopic level [1], which has drawn growing interests in the research of lab-on-a-chip [2], storage, conversion and exploitation of energy [3][4][5][6], water purification [7,8], nano-manufacturing [9,10], carbon sequestration in Metal Organic Frameworks [11], gas separation [12,13] and so on. Although the particle-based molecular dynamics (MD) and direct simulation of Monte Carlo (DSMC) have been commonly used to study such systems, these techniques are usually computationally intensive [1], and suffer huge statistical noises, especially for flows near the equilibrium state [14] or in the high density regime [15].…”

Section: Introductionmentioning

confidence: 99%

Discrete unified gas kinetic scheme for all Knudsen number flows. IV. Strongly inhomogeneous fluids

et al. 2020

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This work is an extension of the discrete unified gas kinetic scheme (DUGKS) from rarefied gas dynamics to strongly inhomogeneous dense fluid systems. The fluid molecular size can be ignored for dilute gases, while the nonlocal intermolecular collisions and the competition of solid-fluid and fluid-fluid interactions play an important role for surface-confined fluid flows at the nanometer scale. The non-equilibrium state induces strong fluid structural inhomogeneity and anomalous fluid flow dynamics. According to the previous kinetic model [Z. L. Guo et al., Phy. Rev. E 71, 035301 (2005)], the long-range intermolecular attraction is modeled by the mean-field approximation, and the volume exclusion effect is considered by hard-sphere potential in the collision operator. The kinetic model is solved by the DUGKS, which has the characteristics of asymptotic preserving, low dissipation, second order accuracy and multidimensional nature. Both static fluid structure and dynamic flow behaviors are calculated and validated with Monte Carlo or molecular dynamics results. It is shown that the flow of dense fluid systems tends to that of rarefied gases as the dense degree decreases or the mean flow path increases. The DUGKS is proved to be applicable to simulate such non-equilibrium dense fluid systems.

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Section: Introductionmentioning

confidence: 99%

Discrete unified gas kinetic scheme for all Knudsen number flows. IV. Strongly inhomogeneous fluids

et al. 2020

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“…This velocity slip is described by the additional differential equations [116][117][118]. Additionally, the components fraction jump takes into account the implementations of numerical codes' more sophisticated boundary conditions [119,120]. Therefore, to correctly describe the individual frictional mixing elements, the Witte model should be extended by τ + R + f ∂V n + n f ∂V .…”

Section: Mixing and Condensation Process For The Spray-ejector Condensermentioning

confidence: 99%

Compact High Efficiency and Zero-Emission Gas-Fired Power Plant with Oxy-Combustion and Carbon Capture

et al. 2022

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Reduction of greenhouse gases emissions is a key challenge for the power generation industry, requiring the implementation of new designs and methods of electricity generation. This article presents a design solution for a novel thermodynamic cycle with two new devices—namely, a wet combustion chamber and a spray-ejector condenser. In the proposed cycle, high temperature occurs in the combustion chamber because of fuel combustion by pure oxygen. As a consequence of the chemical reaction and open water cooling, a mixture of H2O and CO2 is produced. The resulting working medium expands in one turbine that combines the advantages of gas turbines (high turbine inlet temperatures) and steam turbines (full expansion to vacuum). Moreover, the main purpose of the spray-ejector condenser is the simultaneous condensation of water vapour and compression of CO2 from condensing pressure to about 1 bar. The efficiency of the proposed cycle has been estimated at 37.78%. COM-GAS software has been used for computational flow mechanics simulations. The calculation considers the drop in efficiency due to air separation unit, carbon capture, and spray-ejector condenser processes. The advantage of the proposed cycle is its compactness that can be achieved by replacing the largest equipment in the steam unit. The authors make reference to a steam generator, a conventional steam condenser, and the steam-gas turbine. Instead of classical heat exchanger equipment, the authors propose non-standard devices, such as a wet combustion chamber and spray-ejector condenser.

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“…Although the issue of shaping the turbine blades has appeared in literature since the beginning of the last century [1], there are new concepts appeared over the years [2,3]. There was a big development not only in the concepts themselves, but also in a research tool, which, starting with analytical tools [1] and was transformed over the years into analyzes taking into account sophisticated numerical tools [4][5][6][7]. Currently, turbine companies rely on a fully three-dimensional approach, both in the case of stress analyzes related to the solid as well as analyzes increasing the efficiency -flow analyzes [8].…”

Section: Introductionmentioning

confidence: 99%

Revalorisation of the Szewalski’s concept of the law of varying the last-stage blade retraction in a gas-steam turbine

et al. 2021

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The article presents the implementations of the free vortex law to the blade of the last stage of a gas-steam turbine. First, a thermodynamic analysis was carried out, determining the parameters at the inlet, then the number of stages of the high and low-pressure part of the turbine was constructed, together with the kinematics and velocity vectors for subsequent stages of the axial turbine. The last step of article was to take into account the law of variation of the peripheral component of the velocity of the medium working with the radius of the turbine in a discrete way and to make a 3D drawing of the resulting geometry. When creating the spatial model, the atlas of profiles of reaction turbine stages was used.

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Enhanced energy conversion as a result of fluid-solid interaction in micro- and nanoscale

Cited by 16 publications

References 19 publications

Discrete unified gas kinetic scheme for all Knudsen number flows. IV. Strongly inhomogeneous fluids

Discrete unified gas kinetic scheme for all Knudsen number flows. IV. Strongly inhomogeneous fluids

Compact High Efficiency and Zero-Emission Gas-Fired Power Plant with Oxy-Combustion and Carbon Capture

Revalorisation of the Szewalski’s concept of the law of varying the last-stage blade retraction in a gas-steam turbine

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