An immersed boundary-lattice Boltzmann method with multi relaxation time for solving flow-induced vibrations of an elastic vortex generator and its effect on heat transfer and mixing

Hosseini, Soheil; Aghebatandish, Saharnaz; Dadvand, Abdolrahman; Khoo, Boo Cheong

doi:10.1016/j.cej.2020.126652

Cited by 26 publications

(2 citation statements)

References 53 publications

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“…We choose to solve the two-dimensional equations of motion inside the cavity with the 9-bit D2Q9 lattice Boltzmann model presented in reference [15] and the non-equilibrium extrapolation scheme proposed by Guo et al [16], which provides second order accuracy in both space and time. The lattice Boltzmann method has been shown a valid approach to even more complex fluid dynamic problems than those tackled here, such as involving heat transfer [17], non-Newtonian fluids [18], hydrology applications [19], porous media [20] or fluid-solid interfaces [21] among others, and is subject to constant ongoing development for its applications to new fields [22][23][24][25][26][27]. The numerical method has been coded in-house and extensively tested in the past [1][2][3], where thorough mesh-independence studies were undertaken.…”

Section: U V P X Y T Re U V P X Y T Re M U V P X Y T Re U V P X Y T R...mentioning

confidence: 98%

Square Cavity Flow Driven by Two Mutually Facing Sliding Walls

Bergadà²,

Sang

et al. 2022

SSRN Journal

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Section: U V P X Y T Re U V P X Y T Re M U V P X Y T Re U V P X Y T R...mentioning

confidence: 98%

Square Cavity Flow Driven by Two Mutually Facing Sliding Walls

Bergadà²,

Sang

et al. 2022

SSRN Journal

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“…The EVG obtains lower pressure loss than the rigid vortex generator (RVG). Hosseini et al [16] investigated heat transfer enhancement in two-dimensional microchannels with square obstacles and elastic beams. Results showed that the thermohydraulic performance factor of the elastic beam is 32% higher than that of the rigid beam.…”

Section: Introductionmentioning

confidence: 99%

Effects of elastic pillars on fluid-flow and heat transfer enhancement in a micro-channel

Yang

Wang

et al. 2023

Therm sci

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In this paper, periodic vortices are generated by a fluid passing a cylindrical obstacle near the microchannel inlet. Two elastic pillars are arranged on the walls, and the effect of the pillar spacing on heat transfer performance is studied using the Arbitrary Lagrangian-Euler method. With the spacing of 10d, the small pillar amplitude of 2 ?m is not conducive to the generation of vortices. The flexible vortex generator has higher heat transfer efficiency and lower pressure loss than the rigid vortex generator. The two pillars with no spacing generate isolated vortices, and the mixing of these vortices is insufficient downstream the pillars. It is found that with the pillar spacing of 5d, the overall performance factor is significantly higher than that with the pillar spacing of 0 and 10d in the Reynolds number range of 800 to 1,100. The average Nusselt number with the spacing of 5d increases by 19.2% compared to that with the spacing of 0 at the Reynolds number of 1,000. When the Reynolds number is 1,100, the overall performance factor is 43% higher than that with a single rigid pillar. The vortices are periodically generated by the two pillars with the 5d spacing, and the disturbance to the boundary layer enhances the heat transfer downstream the region in the microchannel.

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Study on mixing characteristics of multichamber static mixer

Shi

Liu

2023

Engineering Reports

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This study presents a specialized mixer design for gas burners aimed at improving the efficiency of phase mixing while minimizing system resistance and energy consumption. The proposed design utilizes a multi‐cavity mixer employing both radial and axial mixing techniques, eliminating the need for additional power supply. Full premixed combustion of small gas‐fired industrial boiler has the function of “inhibiting” NOx emission from the source, and good mixing of fuel and combustion supporting air in the early stage is the primary prerequisite for realizing full premixed combustion denitration. In this article, a radial multichamber static mixer is designed following the characteristics of full premixed mixing in gas‐fired industrial boilers. The results demonstrate that the maximum pressure drop of the static mixer is 806 Pa; for gas and air branch pipes, the resistance coefficient f decreases rapidly with the increase in Reynolds number; when Re ≥ 1.2 × 103, the resistance coefficient in the air branch pipe decreases slowly; when Re ≥ 4.5 × 103, the resistance coefficient of gas branch pipe decreases slowly. Additionally, the maximum calculation error of symmetrical gas branch pipe is 9.1%. The static mixer's inlet exhibits a converted velocity of 24 m/s, and the outlet demonstrates an airflow velocity of 23.2 m/s. As a result, a kinetic energy loss of 6.5% is observed. The static mixing chamber makes the airflow rotate and causes different gases to shear and mix. The mixing channel has the function of correcting the airflow deviation, especially for the sudden expansion section. Generally, the two gases can be mixed evenly at the outlet of the mixer. The standard k‐e model and realizable k‐e model are employed to simulate the sudden expansion channel, and indicate that the standard k‐e has a wider range of influence. Further investigation is recommended to better comprehend and optimize this particular area of influence.

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An immersed boundary-lattice Boltzmann method with multi relaxation time for solving flow-induced vibrations of an elastic vortex generator and its effect on heat transfer and mixing

Cited by 26 publications

References 53 publications

Square Cavity Flow Driven by Two Mutually Facing Sliding Walls

Square Cavity Flow Driven by Two Mutually Facing Sliding Walls

Effects of elastic pillars on fluid-flow and heat transfer enhancement in a micro-channel

Study on mixing characteristics of multichamber static mixer

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