Flow and mixing in a tube-in-tube millireactor with multiholes jet and twist tapes

Liu, Hanyang; Jiang, Junan; Yang, Ning; Xiao, Zundong; Yang, Xiaoxia; Wang, Rijie

doi:10.1007/s41981-022-00232-2

Cited by 3 publications

(2 citation statements)

References 58 publications

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“…The 2D2C‐PIV system (Dantec) was used in our study. More information about the experimental setup can be found in the supporting information and our previous article 34 …”

Section: Methodsmentioning

confidence: 99%

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Investigations of mixing and heat transfer in a structured tube‐in‐tube millireactor by numerical, experimental and statistical methods

Liu

Jiang

Wang

et al. 2022

Asia-Pacific J Chem Eng

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Millireactors are widely used in flow chemistry due to their process intensification performance and sufficient product throughout. A novel structured tube‐in‐tube millireactor with industrial potential was designed, whose mixing and heat transfer were investigated by experiment and CFD. Partial least square regression (PLS) was introduced in the flow chemistry study and used to determine that the key parameters of the millireactor were jet Reynolds ( Reh) and hole diameter ()Dh. The introduction of twist tape in the annular space generates swirling flow, which effectively increases the heat transfer capacity (up to 16.5 times). This millireactor achieves excellent mixing (>99% of mixing intensity after 1 cm) and the heat transfer enhancement ratio up to 6.5. The local flow field and concentration field from CFD model agreed with those obtained from PIV and PLIF visualization experiments.

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“…The 2D2C‐PIV system (Dantec) was used in our study. More information about the experimental setup can be found in the supporting information and our previous article 34 …”

Section: Methodsmentioning

confidence: 99%

“…In our past work, we designed a tube‐in‐tube millireactor with multiholes jet and twist tapes 34 . Results from Villermaux/Dushman reaction and residence time distribution experiment demonstrate its excellent micromixing and macromixing (RTD curves similar to plug flow).…”

Section: Introductionmentioning

confidence: 99%

Investigations of mixing and heat transfer in a structured tube‐in‐tube millireactor by numerical, experimental and statistical methods

Liu

Jiang

Wang

et al. 2022

Asia-Pacific J Chem Eng

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Seamless scale‐up of tube‐in‐tube millireactors by annular structure and feed method design: Micromixing, residence time distribution and heat transfer

Liu,

Yang,

Jiang

et al. 2024

AIChE Journal

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Flow chemistry is widely valued for its enhanced transport properties and safety, but scaling up while maintaining the advantages of the microenvironment in small‐scale systems remains challenging. We addressed this by developing a novel tube‐in‐tube millireactor with a multi‐hole jet inlet and deflectors, designed to maintain consistent flow regimes and optimize micromixing, residence time distribution (RTD), and heat transfer at various scales. The reactor increases flux by enlarging tube diameters and incorporating micro‐holes and deflectors, all while maintaining a constant annular space. This design, validated through both CFD modeling and experimental results, maintains consistent fluid flow and excellent transfer properties, achieving micromixing time below 2 ms at Reh > 2000, a plug‐flow‐like RTD profile, and a heat transfer capacity up to 12.4 times greater than conventional designs. This study presents a simple, scalable approach to millireactor design, combining “number‐up” and “size‐up” strategies, offering a cost‐effective solution for industrial applications.

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Effect of annulus ratio on the residence time distribution and Péclet number in micro/milli‐scale reactors

Yang,

Xiao,

Liu

et al. 2024

Can J Chem Eng

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Micro/milli‐scale annular reactor with straight and helical forms has excellent heat and mass transfer performance due to the short molecular diffusion distance and dual‐wall surface transport. The annular gap spacing is scalable by adjusting the inner and outer tube diameter. The influence of diffusion and convection effects on axial dispersion as expanding the flow scale requires further elucidation with the help of residence time distribution (RTD) curves and Péclet (Pe) numbers. The correlation of RTD characteristics with annulus ratio γ = Dh/D (ratio of annulus characteristic size to outer diameter) is investigated using computational fluid dynamics. Results show that with enlarging the straight annular gap from micro‐scale to milli‐scale, RTD characteristics exhibit opposing patterns. This can be attributed to the transition from diffusion‐dominated to convection‐dominated on momentum transfer, and the transition interval is 0.167 < γ < 0.250. Correlation equations of Pe number with Reynolds (Re) number and γ are established under diffusion‐dominated and convection‐dominated states. The symmetrically distributed secondary flow in the helical annular gap effectively elevates the Pe (Pemax > 100). Correlation equations of Pe with Re and γ are established in helical annular gaps with 0.083 < γ < 0.208 and 0.167 < γ < 0.500. The above results contribute to understanding the annular flow RTD characteristics for better applications of tube‐in‐tube reactors.

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Flow and mixing in a tube-in-tube millireactor with multiholes jet and twist tapes

Cited by 3 publications

References 58 publications

Investigations of mixing and heat transfer in a structured tube‐in‐tube millireactor by numerical, experimental and statistical methods

Investigations of mixing and heat transfer in a structured tube‐in‐tube millireactor by numerical, experimental and statistical methods

Seamless scale‐up of tube‐in‐tube millireactors by annular structure and feed method design: Micromixing, residence time distribution and heat transfer

Effect of annulus ratio on the residence time distribution and Péclet number in micro/milli‐scale reactors

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