Numerical Study of Thin-Walled Sampler Performance for Aerosols in Low Windspeed Environments

Liu

Lan

et al. 2013

AMM

A aerosol sampling inlet has been designed from high-speed aircraft. The objective of the design is to achieving isokinetic and minimizing disturbance for the sampling system. This study was conducted using the CFD code to perform a turbulent simulation of the airflow on the aerosol sampling inlet. The inlet is flown regularly on board an aircraft of Yun-12. The flow rate through the sampling suction tube is a constant value of 100 L/min. The shroud diameter is 150 mm. The diffusion tube inlet and outlet diameter is 35.3 mm. The suction tube diameter is 20.6 mm, which act as transferring aerosol at the velocity of 5 m/s. Results are presented graphically, showing the suction bending radius take 50 mm is more appropriate. It is shown that the diffusion tube slows the sample flow from 40 m/s of the airspeed of the aircraft to approximately 5 m/s. It is suggested that CFD simulation can be useful for improving the optimum aircraft-carried aerosol sampling inlet.

Section: Introductionmentioning

confidence: 99%

Aircraft-Carried Aerosol Sampling Inlet by CFD Simulation

Liu

Lan

et al. 2013

AMM

“…If impinging streamlines of gas are not aligned with the sampling inlet, this may influence collection efficiency for aerosol particles [1], probably because of impaction on internal inlet surfaces. Shrouds have been used with aligning streamlines with axes of gas-sampling inlets, e.g., Soderman et al [2], Murphy et al [3], Eisele et al [4], Lipatov et al [5], Dunnett et al [6], and Zaripov, et al [7].…”

Section: Introductionmentioning

confidence: 99%

Flow Analysis of a Shrouded Aerosol Sampling Inlet

Shu

et al. 2013

AMM

A shrouded aerosol sampling inlet has been designed from high-speed aircraft. The sampling inlet was conducted using the CFD to perform a flow simulation. The shroud diameter is 150 mm. The inlet is located 180mm from the shroud entrance plane. The shroud is 300 mm long. Results are presented graphically, showing the shrouds have provided significant improvements in flow characteristics. Straighten the streamlines of gas of sampling inlet for flow angles up to five degrees. It is suggested that CFD simulation can be useful for improving the optimum a shrouded aerosol sampling inlet.

Aerosol Science and Technology

“…The results of experimental studies on the inhalable fraction in slow moving air are given by Schmees et al (2008). A theoretical study of a thin-walled sampler in the environment with very low velocity was presented by Zaripov et al (2010).…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the RespiCon Sampler Performance in the Calm Air

Zaripov

Koch

2013

Results of a numerical study of the RespiCon sampler performance in the calm air are presented. The air flow is described by the Navier-Stokes equations of axisymmetric stationary viscous flow of incompressible fluid that are numerically integrated by the computational fluid dynamics (CFD) software FLUENT. The collection efficiencies of RespiCon impactor stages agree quite well with experimental data and curves of the European standards for the thoracic and respirable dust fractions. The aspiration efficiencies derived from the numerical model overestimate the experimental data in the range of particle sizes of 10 μm < d p < 40 μm; however, they correctly predict the value of maximal size of aspirated particles. A new design of the RespiCon sampler with a higher volume flow rate was developed.