Heat Transfer in 3D Laguerre–Voronoi Open-Cell Foams under Pulsating Flow

Hayrullin, A R; Haibullina, A I; Sinyavin, Alex; Balzamov, Denis; Ilyin, V K; Khairullina, Liliya; Bronskaya, Veronika

doi:10.3390/en15228660

Cited by 4 publications

(4 citation statements)

References 61 publications

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“…The open-cell foam-based CO 2 hydrogenation system is expected to operate under a laminar flow, characterized by a Reynolds number below 400; therefore, carbon dioxide mass transfer in the gas phase is principally dependent on molecular diffusion [59,60].…”

Section: Discussionmentioning

confidence: 99%

Optimization of an Open-Cell Foam-Based Ni-Mg-Al Catalyst for Enhanced CO2 Hydrogenation to Methane

Summa,

Motak,

Da Costa

2023

Catalysts

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In the presented work, the catalytic performance of a nickel catalyst, in CO2 hydrogenation to methane, within a ZrO2 open-cell foam (OCF)-based catalyst was studied. Two series of analogous samples were prepared and coated with 100–150 mg of a Mg-Al oxide interface to stabilize the formation of well-dispersed Ni crystallites, with 10–15 wt% of nickel as an active phase, based on 30 ppi foam or 45 ppi foam. The main factor influencing catalytic performance was the geometric parameters of the applied foams. The series of catalysts based on 30 ppi OCF showed CO2 conversion in the range of 30–50% at 300 °C, while those based on 45 ppi OCF resulted in a significantly enhancement of the catalytic activity: 90–92% CO2 conversion under the same experimental conditions. Calculations of the internal and external mass transfer limitations were performed. The observed difference in the catalytic activity was primarily related to the radial transport inside the pores, confirmed with the explicitly higher conversions.

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Section: Discussionmentioning

confidence: 99%

Optimization of an Open-Cell Foam-Based Ni-Mg-Al Catalyst for Enhanced CO2 Hydrogenation to Methane

Summa,

Motak,

Da Costa

2023

Catalysts

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“…The pulsations had a reciprocating asymmetrical character with different relative amplitude A/D, frequency f=1/T Hz, where T is the pulsation period and dirty cycle  of 0.25. The shape of the velocity pulsations is given in [9]. The Reynolds number, in both steady and pulsating flows, is based on the diameter of the cylinder.…”

Section: Numerical Simulationmentioning

confidence: 99%

“…In the study of pulsating flows to intensify heat transfer, positive results were generally obtained. The possibility of intensifying heat transfer with forced flow pulsations has been studied for flow in pipe [7], flow around cylinder [8], porous media [9], pin-fin array [10], grooved channel [11] etc.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of local heat transfer in tube bundle in pulsating flow

Haibullina,

Hayrullin

2023

E3S Web of Conf.

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Forced pulsating flows enhance the heat transfer of various heat exchange equipment; however, such flows remain poorly understood. A numerical simulation was used to study how the position of a cylinder in a tube bundle affects the heat transfer during pulsating flow. The tubes of the tube bundle were arranged in an in-line order with the same relative pitch of 1.4. The Reynolds number and Prandtl number had constant values of 1500 and 4.03, respectively. The pulsating flow exhibits a reciprocating asymmetrical character. The pulsation amplitude related to the cylinder diameter was in the range from 0.1 to 0.4, and the pulsation frequency was in the range from 0.2 to 0.8 Hz. The numerical simulation results indicated that the heat transfer of the cylinder in the tube bundle was affected by the row number. With pulsating flow, the heat transfer of the cylinder in the first row had a minimum value, whereas the maximum heat transfer was observed in the last row. The effect of the position of the cylinder along the flow in the tube bundle decreases with increasing pulsation intensity. The maximum heat transfer enhancement of 51% was observed in the first row at a frequency of 0.8 Hz and amplitude of 0.4.

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“…Однако в [22,27] в качестве рабочей среды использовался воздух, в нашем исследовании мы использовали воду. В [26] Эффективность несимметричных пульсаций с направленным потоком была показана в пористых средах [28] и пучках труб [23], что согласуется с нашим исследованием. Увеличение теплообмена при несимметричных осцилляциях можно связать с формой скорости и перепада давления.…”

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Experimental study of oscillating flow in tube bundle

Khaibullina,

Khayrullin,

Ilyin

2023

Vestnik IGEU

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Oscillating reciprocating flows are found in a variety of engineering applications. The mechanisms of oscillating flows have not been sufficiently studied. Oscillating flows can be created artificially to increase heat transfer equipment by intensifying heat transfer. Thus, this paper studies the flow and heat transfer characteristics of a tube bundle under the influence of oscillating flow. The assessment of heat transfer and the hydrodynamic flow pattern in a tube bundle during flow oscillations is carried out on the basis of experimental studies. Flow oscillations have been created by a pneumatic system that drove a pulsator. The time characteristic of the pressure drop of the tube bundle has been recorded using an oscilloscope and pressure drop sensors. To assess the dynamics of flow velocity, the high-speed shooting method is used. The heat exchange of a tube bundle has been determined by the electrical power expended to maintain a constant temperature on the tube side of the bundle. For the first time, heat transfer and the hydrodynamic flow pattern with asymmetrical flow oscillations in an inline tube bundle are studied experimentally. It is shown that the shape of oscillations of flow velocity and pressure drop depend on frequency. It has been found that with increasing frequency there is an increase in the values of flow velocity and pressure drop. It has been determined that for certain moments of time, the flow velocity and pressure drop during asymmetrical oscillations exceed symmetrical ones. It has been established that the heat transfer rate of a bundle increases by 1,7 times with an increase in frequency. It has been shown that asymmetrical oscillations are more effective in intensifying heat transfer than symmetrical ones by an average of 1,1 times. Analysis of the results obtained has showed the possibility of intensifying heat transfer in a tube bundle using oscillating flows. Thus, oscillating flows can be used to increase the efficiency of heat exchange equipment. The results obtained on the hydrodynamic flow pattern can be used in mathematical modeling of oscillating flows, which are necessary to expand the operating parameters of the study and determine the most effective ones.

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Heat Transfer in 3D Laguerre–Voronoi Open-Cell Foams under Pulsating Flow

Cited by 4 publications

References 61 publications

Optimization of an Open-Cell Foam-Based Ni-Mg-Al Catalyst for Enhanced CO2 Hydrogenation to Methane

Optimization of an Open-Cell Foam-Based Ni-Mg-Al Catalyst for Enhanced CO2 Hydrogenation to Methane

Numerical study of local heat transfer in tube bundle in pulsating flow

Experimental study of oscillating flow in tube bundle

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