Experimental and Computational Fluid Dynamics Validation of Correlations for Dry Pressure Drop in Trays without Downcomer

Brondani, Michel; Schlemmer, Diego Felipe; Wancura, João H. C.; Mayer, Flávio Dias; Hoffmann, Ronaldo; Rasteiro, Maria G.; Oliveira, Nuno M.C.; Lopes, António Gameiro

doi:10.1002/ceat.201900379

Cited by 3 publications

(4 citation statements)

References 47 publications

(77 reference statements)

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“…The use of adequate fractal geometry can improve the operation of dual-flow trays through a decreased Δ P w while increasing ε to satisfactory values and minimizing the effects of liquid and gas segregation. Furthermore, the fractal distribution of holes tends to stabilize and minimize the pressure drop compared to the results from an equilateral distribution of different hole sizes, considering the same open area fraction . Therefore, this potential advantage of fractal trays should be evaluated by also assessing fractal tray performance in relation to mass transfer in staged contact separation processes.…”

Section: Results and Discussionmentioning

confidence: 99%

“…Furthermore, the fractal distribution of holes tends to stabilize and minimize the pressure drop compared to the results from an equilateral distribution of different hole sizes, considering the same open area fraction. 54 Therefore, this potential advantage of fractal trays should be evaluated by also assessing fractal tray performance in relation to mass transfer in staged contact separation processes.…”

Section: Resultsmentioning

confidence: 99%

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Experimental Fluid Dynamics Study of a New Fractal Dual-Flow Tray

Brondani

Mayer

Hoffmann

et al. 2020

Ind. Eng. Chem. Res.

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Countercurrent flow in conventional dual-flow trays results in segregation in liquid and vapor flow, reducing tray efficiency. Therefore, a new dual-flow tray with fractal geometry was experimentally investigated. Air and water were used as vapor and liquid models. Flow regime and fluid dynamics parameters such as dry (ΔP d ) and wet (ΔP w ) tray pressure drop, froth height (H), clear liquid height (h CL ), and froth porosity (ε) were evaluated. The results showed a lower and a more stable ΔP w in the fractal tray with a smaller hole diameter compared to the conventional tray when F s ranged from 0.59 to 1.04. Fluid dynamics parameters such as H, h CL , and ε were similar between the fractal tray with a smaller hole diameter and the conventional tray for capacity factor (F s ) values from 0.68 to 1.04 and for all values of liquid flow rate (Q L ). Fractal geometry provided a more stable liquid and vapor flow through the alternating formation of high and low pressure microzones.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Experimental Fluid Dynamics Study of a New Fractal Dual-Flow Tray

Brondani

Mayer

Hoffmann

et al. 2020

Ind. Eng. Chem. Res.

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“…Based on the literature [13,20] a correlation for each type of investigated trays was determined, which can be used to determine the dry tray pressure drop of a tray at air flow rate of 20-50 m 3 /h, a tray thickness of 5 mm and a ratio of the perforations and tray area of 15%.…”

Section: Correlations Of Dry Tray Pressure Dropmentioning

confidence: 99%

“…Brondani et al have presented a relationship that determines the dry tray pressure drop of a dry tray without downcomer with 2.0 mm tray thickness [20].…”

Section: Introductionmentioning

confidence: 99%

CFD Investigation of Dry Tray Pressure Drop of Perforated Trays without Downcomer

Kállai

Mizsey

Szepesi

2023

Period. Polytech. Chem. Eng.

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The dry tray pressure drop behaviors in trays without downcomer with different inclination of holes (standard, 75°, 60° and 45°) and tray thickness (2.5, 5, and 10 mm) are investigated. The trays are investigated using computational fluid dynamics (CFD) in Ansys Fluent® software. 20 °C air was used to represent the gas phase with 20–50 m3/h flow rates. The column there are four trays with 7 mm of hole diameter.The CFD results determined that the higher angle of the holes with respect to the tray causes smaller dry tray pressure drop and turbulence intensity in the gas flow. Furthermore, in 75° hole inclined perforated tray and the standard hole the dry tray pressure drop is similar. From the simulation results it is also determined that in case of higher tray thickness the dry tray pressure drop is lower.On the basis of the CFD simulation results some correlations can be determined for the calculation of the dry tray pressure drop of the different trays.

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Design and Hydrodynamics of a Novel Multidowncomer Bubble-Breaking Tray

Wang,

Chen,

Zhou

et al. 2024

Ind. Eng. Chem. Res.

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A novel multidowncomer bubble-breaking (MDBB) tray was designed based on the "droplet bubble-breaking" method to enhance the mass transfer process. The hydrodynamic parameters of the MDBB tray, including the gas−liquid flow pattern, gas holdup, dry pressure drop, clear liquid height, residual pressure drop, and wet pressure drop, were investigated through experiments and computational fluid dynamics. The modeling equations applicable to the MDBB tray were developed. The bubble size in the liquid layer was analyzed. A comparison of the mass transfer capacities of the traditional sieve trays, multidowncomer (MD) trays, and MDBB trays was conducted by using CO 2 absorption experiments. The results indicated that the liquid phase flow on the MDBB tray transitioned from transverse to longitudinal. The average gas holdup on the MDBB tray was found to be 66.3% higher than that on the sieve trays. The increase in wet pressure drop corresponds to a higher liquid flow rate. A wet pressure drop prediction model was established, demonstrating a maximum error of 7.34%. The MDBB tray's CO 2 absorption capacity increased by an average of 29.9% compared to the MD trays and by an average of 36.6% compared to traditional sieve trays.

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Experimental and Computational Fluid Dynamics Validation of Correlations for Dry Pressure Drop in Trays without Downcomer

Cited by 3 publications

References 47 publications

Experimental Fluid Dynamics Study of a New Fractal Dual-Flow Tray

Experimental Fluid Dynamics Study of a New Fractal Dual-Flow Tray

CFD Investigation of Dry Tray Pressure Drop of Perforated Trays without Downcomer

Design and Hydrodynamics of a Novel Multidowncomer Bubble-Breaking Tray

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