Computational fluid dynamics simulation of a rectangular slit real impactor's performance

Hari, Sridhar; Hassan, Yassin A.; McFarland, Andrew R.

doi:10.1016/j.nucengdes.2004.12.004

Cited by 13 publications

(9 citation statements)

References 5 publications

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“…They reported good agreement between the experimental results and the computationally predictions of CFX-4.3. The present authors have also reported a study in which performance characteristics of the real impactor [6] obtained from numerical simulation performed using the CFX- 4.4 code was found to be in good agreement with experimental results [20]. Further studies in which CFX-4.4 was used to simulate the performance of rectangular slit impactors are documented elsewhere [21].…”

Section: Introductionsupporting

confidence: 69%

Aerodynamic Focusing Effect in a Rectangular Slit Real Impactor at Different Reynolds Numbers

Hari

Hassan

McFarland

2006

Part. Part. Syst. Charact.

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Numerical investigations were performed to assess the effect of "aerodynamic focusing" achievable by varying the angle of approach in the convergence section of a rectangular slit real impactor, at different Reynolds numbers. Computational Fluid Dynamics (CFD) approach was used as a tool in the study. Simulations were performed on a slit impactor in which the angle of approach in the inlet section was varied from 15°to 75°, at three different Reynolds number values namely 200, 1000, and 2000, to characterize the effect of "aerody-namic focusing". It is found from the results of the study that the impactor efficiency curve and cut-point SQRT (Stk) 50 value are strong functions of the above parameters. Aerodynamic focusing effect achievable by varying the angle of inlet convergence section is delineated with appropriate particle tracks. Results of the study are expressed as a surface plot of the cut-point SQRT (Stk) 50 value as a function of the Reynolds number and the angle of approach and a correlation relating the parameters is presented.

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Section: Introductionsupporting

confidence: 69%

Aerodynamic Focusing Effect in a Rectangular Slit Real Impactor at Different Reynolds Numbers

Hari

Hassan

McFarland

2006

Part. Part. Syst. Charact.

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“…This procedure was repeated until the computations were complete for all the segments. The IS procedure with mapping data between the segments simulates the flow fields across the whole ACI more accurately and represents a significant improvement upon previous cascade impactor models [5][6][7][8][9].…”

Section: Iterative Simulation Procedures and Data Mappingmentioning

confidence: 99%

“…Gulak et al [6] adopted a similar approach but the results were extrapolated to represent the multiple jets impactors. Hari et al [7] performed a 2D CFD simulation and used the Eulerian-Lagrangian approach to track particles. The collection efficiency of the low pressure impactors has been studied using numerical simulations by Arffman et al [8].…”

Section: Introductionmentioning

confidence: 99%

Computational fluid dynamics (CFD) investigation of the gas–solid flow and performance of Andersen cascade impactor

et al. 2015

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“…Their studies involved analyzing the effects on performance of the Reynolds number, the ratio of jet characteristic dimension to the distance between the jet exit plane and plate, and the Stokes number. Hari et al (2005) conducted numerical studies on the sensitivities of the factors that affect the performance of a rectangular slit impactor including gravity and ultra-Stokesian drag. Their predictions agreed well with the experimental results.…”

Section: Introductionmentioning

confidence: 99%

CFD Study on Compound Impaction in a Jet-in-Well Impactor

Seshadri

McFarland

2007

Aerosol Science and Technology

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In a classical jet impactor, the jet is assumed to impact on an infinite plate; however, the typical construction of an impactor necessitates that a wall surrounds the jet. If the wall is close to the jet, secondary impaction can take place on the wall. Also, for some impactor designs, e.g., large particle scalping devices in air sampling inlets, the jet is purposefully placed in a well and the overall performance of the impactor is the compound effect of the jet impacting on a collection plate and on the wall of the well. In this study we primarily use CFD to examine the performance of compound round jet impactors, where the ratio of well diameter to jet diameter is from 3 to 15 and the particle size is in the range of 5 to 15 µm AD. The onset of the secondary impaction occurs at a ratio of well diameter to jet diameter of about eight with the collection on the side wall increasing for smaller ratios. Compound impaction can significantly enhance the overall particle collection and can result in a much smaller value of Stk 0.5 . At a ratio of well diameter to jet diameter of 3, the value of Stk 0.5 is 0.07, as compared with a classical circular jet impactor where Stk 0.5 is about 0.24 for a typical set of operational and configuration parameters. Numerical predictions for the jet-in-well impactors are compared with experimental results using liquid particles and good agreement is obtained. Photos taken over a range of experimental conditions verify the strong side wall impaction for certain conditions. INTRODUCTIONThe geometry of a classical impactor is simple and the device is both easy to fabricate and operate. Impactors have been studied extensively for different configurations and operational

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Computational fluid dynamics simulation of a rectangular slit real impactor's performance

Cited by 13 publications

References 5 publications

Aerodynamic Focusing Effect in a Rectangular Slit Real Impactor at Different Reynolds Numbers

Aerodynamic Focusing Effect in a Rectangular Slit Real Impactor at Different Reynolds Numbers

Computational fluid dynamics (CFD) investigation of the gas–solid flow and performance of Andersen cascade impactor

CFD Study on Compound Impaction in a Jet-in-Well Impactor

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