New PM₁₀Inlet Design and Evaluation

Abstract

ABSTRACT. A new PM,,, inlet for a beta-gauge sampler was designed based on the particle cup impactor concept. The performance of the inlet was evaluated at near-zero wind velocity in the test chamber and at the wind velocities of 2 and 8 kmlhr in the wind tunnel. The performance indicated that particles with aerodynamic diameters of 10 pm or larger were collected in the particle cup and the inlet proved to meet the basic requirement of PM,, sampling. AEROSOL SCIENCE AND

Characterization of a particle trap impactor

“…So far, many researchers who studied the particle matter (PM) inlets using particle trap impactors have employed the design of inertial impactors for the design parameter of particle trap impactors (Kim et al, 1998(Kim et al, , 2003, and they used 0.49 as √ Stk 50 . In their works, they reduced the nozzle-to-trap distance significantly to meet the cutoff diameter of the PM inlets.…”

“…So far, the value of 0.24 was used for the Stk 50 of particle trap impactors and cup impactors (Kim et al, 1998;Kim, Han et al, 2002). The acceleration nozzle diameter (D 1 ) of System I, 2.6 mm, was determined from the Stk 50 , and that of System II (2.2 mm) was decided to increase collection efficiency and to obtain the low cutoff diameter (Kim, Han et al, 2002).…”

“…Tsai and Cheng (1995) investigated the effect of solid particle loading on the collection efficiency of an impactor with different impaction surface designs. The particle trap impactor was applied to a sampling inlet with a cutoff diameter of 10 or 2.5 m (Kim, Kim, & Lee, 1998;Kim, Hong, Kim, Lee, & Lee, 2003). Major advantages of the particle trap impactors are their freedom from particle bounce-off and the problem of overload.…”

Development of an Automatic Beta Gauge Particulate Sampler with Filter Cassette Mechanism

“…Atmospheric aerosols are drawn through an inlet tube at a constant volumetric ow rate of 25.0 L/min, the design ow rate for the PM 10 inlet. The PM 10 sampling inlet developed for the beta gauge sampler was previously discussed (Kim et al 1998). The inlet based on the particle trap impactor has a cutoff diameter of 10.4 ¹m.…”

On the Modification of the Low Flow-Rate PM10Dichotomous Sampler Inlet

“…An inlet often includes an integral particle size separator to remove particles of sizes greater than the size range to be collected by the sampler. Current inlets in use for sampling particulate matter with aerodynamic diameters <10 ¹m (PM 10 ) employ impactors (Liu and Pui 1981;McFarland and Ortiz 1982;Kim et al 1998) or cyclones (Wedding et al 1982) to limit particle collection to the PM 10 size range. The Federal Reference Method (FRM) for ne particulate matter (PM 2:5 ), as it was originally proposed (U.S. EPA 1996), speci ed a particular at-topped inlet with an internal impactor (see Figure 1) that aspirates particulate matter sample air from the atmosphere at 16.7 l/min (MacFarland and Ortiz 1982).…”