3-D simulation of flow behaviour and film distribution outside a horizontal tube

Q, Qiu; Meng, Chuiju; Quan, Shenglin; Wang, Weishu

doi:10.1016/j.ijheatmasstransfer.2016.11.009

Cited by 37 publications

(10 citation statements)

References 20 publications

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“…The present analysis focuses on an absorptive liquid film flowing over a vertical row of horizontal smooth tubes. Droplet impact and hydrodynamic boundary layer development (19)(20)(21)(22)(23)(24)(25)30) are not discussed herein. In order to reach a closed analytical solution of the governing transport equations, heat and mass transfer processes are considered under the following main assumptions:…”

Section: Physical Modelmentioning

confidence: 99%

Heat and mass transfer coefficients of falling-film absorption on a partially wetted horizontal tube

Giannetti

Rocchetti

Yamaguchi

et al. 2018

International Journal of Thermal Sciences

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Section: Physical Modelmentioning

confidence: 99%

Heat and mass transfer coefficients of falling-film absorption on a partially wetted horizontal tube

Giannetti

Rocchetti

Yamaguchi

et al. 2018

International Journal of Thermal Sciences

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“…Qiu et al 41 adopted a 3D numerical method to analyze the distribution of the falling liquid over the horizontal tubes. The formation saddle‐shaped lamella was observed in the axial direction.…”

Section: Introductionmentioning

confidence: 99%

Characterization of column flow regimes on horizontal tubes for falling‐film systems: An experimental approach

Kandukuri

Deshmukh

Katiresan

2022

Asia-Pacific J Chem Eng

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The intertube flow regimes and hydrodynamic behavior of the liquid profile have a significant impact on the functioning of falling-film evaporators. Column flow is one of the fundamental flow modes, which is actively observed in many industrial evaporators. A high-speed digital photographic device is utilized to visualize the complete progression of column flow phases for intertube distances of 10/20/30/40 mm and Reynolds number (Re) values ranging from 41 to 583. The Sobel edge detection algorithm is implemented to quantify the flow parameters for each frame of a sequence. The research results indicated that the column flow regime between the inline horizontal tubes can be broadly classified into the following phases: columnar droplet flow, periodic column flow, satellite drops column flow, drift column flow, and mixing liquid film column flow. The findings show that the liquid jet diameters between the tubes range from 1.6 to 8.46 mm, an increase in the liquid jet diameter with Re and a decrease with tube-to-tube distance. The axial coverage of the liquid film profile beneath the tube differed from 2.07 to 3.99 mm and over the tube surface ranged from 1.14 to 2.68 mm. The formation of dry spots and flooding is a major problem in the operation of falling-film heat exchangers. The shape and size of the liquid jet have a direct impact on the interfacial area; understanding the entire progression of column flow regimes, as well as their characteristics, can help designers avoid the aforementioned problem.

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“…Most of the computational works relate to the simulation of fluid flow over bundles of smooth horizontal tubes, since tube bundles are the main structural elements of promising film heat exchangers. So, for example, the authors of [10,11] provided the 2-and 3D simulation of flow behavior and film distribution outside a smooth horizontal tube.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modelling of Liquid Film Spreading Dynamics over Smooth Vertical Surface under Isothermal Conditions

Sakhnov

Volodin

Pecherkin

et al. 2021

J. Phys.: Conf. Ser.

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The paper presents numerical modelling of the liquid film spreading dynamics of the R21 (mol. fraction: 0.9) and R114 refrigerants mixture. We considered an outer flow along a round vertical cylinder at Reynolds number of 104 and various contact angles. The simulation was performed in OpenFOAM software on the basis of the volume of fluid (VOF) method. We have shown that the wetting front deforms at wetting angles of 30 and 50 degrees, and regular jets form. At the same time, it was demonstrated that at the wetting angle of 10 degrees the spreading front has practically a flat shape, but one may see some regular thickenings of the liquid film along the contact line of the front.

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3-D simulation of flow behaviour and film distribution outside a horizontal tube

Cited by 37 publications

References 20 publications

Heat and mass transfer coefficients of falling-film absorption on a partially wetted horizontal tube

Heat and mass transfer coefficients of falling-film absorption on a partially wetted horizontal tube

Characterization of column flow regimes on horizontal tubes for falling‐film systems: An experimental approach

Numerical Modelling of Liquid Film Spreading Dynamics over Smooth Vertical Surface under Isothermal Conditions

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