Flow characteristics of a small‐hole sieve tray

Biddulph, Michael W.; Bultitude, Derek P.

doi:10.1002/aic.690361217

Cited by 7 publications

(4 citation statements)

References 5 publications

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“…Liquid flow patterns on trays are complex and far from uniform because of the agitation caused by rising vapor, dispersion, and expanding and contracting flow paths owing to the circular cross-section of the column . Several experimental investigations have revealed the existence of liquid maldistribution on the trays. − The stimulus-response method has been largely preferred for determining flow and mixing patterns of liquid. In this method, the liquid residence time distribution (RTD) is obtained through dispersion of a tracer (e.g., dye or salt solution), which is injected in the inflowing liquid stream prior to inlet weir as an instantaneous pulse or step .…”

Section: Introductionmentioning

confidence: 99%

Development of a Refined RTD-Based Efficiency Prediction Model for Cross-Flow Trays

Vishwakarma

Schubert

Hampel

2019

Ind. Eng. Chem. Res.

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The present work describes the mathematical formulation of a new tray efficiency model through refinement of the conventional residence time distribution (RTD) approach [Foss et al. AIChE J. 1958, 4(2), 231−239]. Geometrical partitioning of a tray into compartments along the main liquid flow direction is a prerequisite in the new model. This partitioning allows computation of the tray efficiency through quantification of the efficiency of the individual compartments. The new model ensures that the fluid dynamics of each compartment contributes toward the overall tray efficiency. This breaks the previous black-box convention of the existing models, which only refer to flow profiles at the tray boundaries. The tray segmentation further aids in analyzing the impact of vapor flow maldistribution on the tray efficiency. The capabilities of the new model are demonstrated in two separate case studies after the model validation for perfectly mixed liquid flow in the compartments and biphasic plug flow on the tray.

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Section: Introductionmentioning

confidence: 99%

Development of a Refined RTD-Based Efficiency Prediction Model for Cross-Flow Trays

Vishwakarma

Schubert

Hampel

2019

Ind. Eng. Chem. Res.

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“…Yu et al and Bennett and Grimm investigated the liquid‐phase eddy diffusivity above the sieve tray, which is the key to calculating overall tray efficiency based on point efficiency. Porter et al, Zuiderweg et al, Takahashi et al, Bultitude and Bultitude Malvin et al, Singh et al, and Schubert et al investigated the characteristics of flow regimes on the sieve tray. They proposed the transition conditions of flow regimes and illustrated the effect of varying regimes on the tray performance.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis and quantitative design of a flow‐guiding sieve tray by computational fluid dynamics

Zhao

et al. 2019

AIChE Journal

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An evolution of the traditional sieve tray, the flow‐guiding sieve tray (FGST), has been utilized in many separation processes, especially for handling viscous systems. The objectives of this work are to optimize the design process of FGSTs and realize the full potential of their separation performance. A computation fluid dynamic (CFD) model that incorporated the modified interphase momentum transfer term was developed. Simulated measures of hydrodynamic performance, such as pressure drop, weeping, entrainment, and clear liquid height agree well with the experimental data, thus verifying the accuracy and reliability of the CFD model established in this work. Furthermore, based on the obtained hydrodynamic parameters, a quantitative model for designing flow‐guiding holes was established and validated by modifying an experimental FGST (diameter 476 mm) and reconstructing an industrial sieve‐tray tower (diameter 1,200 mm). The hydrodynamic parameters and quantitative model are of vital importance for better design and further modification of FGST.

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“…8,9 Additionally, the hydrogen bubble and flow vanes techniques gave liquid velocity distributions on the tray, 10,11 and the cantilever strain gauge probe technique gave both direction and velocity directly. 12 These studies have established a detailed picture of fluid flow patterns on the tray. However, those techniques had their limitations, and a simple, direct, and accurate indication of residence time distribution will be very useful.…”

Section: Introductionmentioning

confidence: 99%

“…For understanding more about the flow phenomena across large trays, many experiments have been carried out and a variety of techniques were developed. Simple techniques included floats dropped onto the surface of the froth 1,2 and colored dye injection. , Common methods included salt and fluorescein dye solution tracer injection. − And, the use of the water cooling method gave temperature profiles of liquid on a tray analogous to concentration profiles. , Additionally, the hydrogen bubble and flow vanes techniques gave liquid velocity distributions on the tray, , and the cantilever strain gauge probe technique gave both direction and velocity directly …”

Section: Introductionmentioning

confidence: 99%

New Technique for Measuring Fluid Flow Patterns on a Multiple Downcomer Tray

Wang

Yao

2007

Ind. Eng. Chem. Res.

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Fluid flow patterns on a distillation tray played an important role in the tray efficiency. A new technique for measuring fluid flow patterns on a distillation tray was introduced. The new technique involved observing a step input of a liquid tracer of higher temperature while keeping a record with a thermal infrared camera, and the principle for measurement was also deduced. Experiments were carried out in a 1200-mm-diameter simulation column using two types of trays with one and two hanging downcomers. With the new technique, the detailed picture of the residence time distribution on a multiple downcomer tray was obtained. The results showed that the new technique was convenient, accurate, and not contaminated to measure the residence time distribution of the tray. A stagnant region existed in the multiple downcomer tray. The size of the stagnant region decreased with a decrease of the liquid rate and bubbling of air. The initial velocity of liquid entering the tray determined the flow pattern of the tray.

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Flow characteristics of a small‐hole sieve tray

Cited by 7 publications

References 5 publications

Development of a Refined RTD-Based Efficiency Prediction Model for Cross-Flow Trays

Development of a Refined RTD-Based Efficiency Prediction Model for Cross-Flow Trays

Performance analysis and quantitative design of a flow‐guiding sieve tray by computational fluid dynamics

New Technique for Measuring Fluid Flow Patterns on a Multiple Downcomer Tray

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