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Article

The Effect of a Backward-Facing Step on Flow and Heat Transfer in a Polydispersed Upward Bubbly Duct Flow

1
Laboratory of Thermal and Gas Dynamics, Kutateladze Institute of Thermophysics, Siberian Branch of Russian Academy of Sciences, Academician Lavrent’ev Avenue 1, 630090 Novosibirsk, Russia
2
Laboratory of Problems of Heat and Mass Transfer, Kutateladze Institute of Thermophysics, Siberian Branch of Russian Academy of Sciences, Academician Lavrent’ev Avenue 1, 630090 Novosibirsk, Russia
*
Author to whom correspondence should be addressed.
Academic Editor: Majid Mohammadian
Water 2021, 13(17), 2318; https://doi.org/10.3390/w13172318
Received: 29 June 2021 / Revised: 19 August 2021 / Accepted: 20 August 2021 / Published: 24 August 2021
(This article belongs to the Special Issue Gas-Liquid Two-Phase Flow in the Pipe or Channel)
The experimental and numerical results on the flow structure and heat transfer in a bubbly polydispersed upward duct flow in a backward-facing step are presented. Measurements of the carrier fluid phase velocity and gas bubbles motion are carried out using the PIV/PLIF system. The set of RANS equations is used for modeling the two-phase bubbly flow. Turbulence of the carrier fluid phase is predicted using the Reynolds stress model. The effect of bubble addition on the mean and turbulent flow structure is taken into account. The motion and heat transfer in a dispersed phase is modeled using the Eulerian approach taking into account bubble break-up and coalescence. The method of delta-functions is employed for simulation of distributions of polydispersed gas bubbles. Small bubbles are presented over the entire duct cross-section and the larger bubbles mainly observed in the shear mixing layer and flow core. The recirculation length in the two-phase bubbly flow is up to two times shorter than in the single-phase flow. The position of the heat transfer maximum is located after the reattachment point. The effect of the gas volumetric flow rate ratios on the flow patterns and maximal value of heat transfer in the two-phase flow is studied numerically. The addition of air bubbles results in a significant increase in heat transfer (up to 75%). View Full-Text
Keywords: turbulent bubbly flow; backward-facing step; PIV/PLIF measurements; RANS modeling; flow structure; heat transfer turbulent bubbly flow; backward-facing step; PIV/PLIF measurements; RANS modeling; flow structure; heat transfer
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MDPI and ACS Style

Bogatko, T.V.; Chinak, A.V.; Evdokimenko, I.A.; Kulikov, D.V.; Lobanov, P.D.; Pakhomov, M.A. The Effect of a Backward-Facing Step on Flow and Heat Transfer in a Polydispersed Upward Bubbly Duct Flow. Water 2021, 13, 2318. https://doi.org/10.3390/w13172318

AMA Style

Bogatko TV, Chinak AV, Evdokimenko IA, Kulikov DV, Lobanov PD, Pakhomov MA. The Effect of a Backward-Facing Step on Flow and Heat Transfer in a Polydispersed Upward Bubbly Duct Flow. Water. 2021; 13(17):2318. https://doi.org/10.3390/w13172318

Chicago/Turabian Style

Bogatko, Tatiana V., Aleksandr V. Chinak, Ilia A. Evdokimenko, Dmitriy V. Kulikov, Pavel D. Lobanov, and Maksim A. Pakhomov 2021. "The Effect of a Backward-Facing Step on Flow and Heat Transfer in a Polydispersed Upward Bubbly Duct Flow" Water 13, no. 17: 2318. https://doi.org/10.3390/w13172318

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