A New Dual-type DMA for the Measurement
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A New Dual-type DMA for the Measurement of Nanoparticles from Engines. Kazuo Takeuchi 1,2) , Junsuke Yabumoto 1,2) , Yoshiki Okada 1,2) 1) Wyckoff Co., Ltd., 2) RIKEN Akio Kibayashi 3) 3) Shimadzu Co. Terunao Kawai 4) and Yuichi Goto 4) 4) NTSEL.

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A New Dual-type DMA for the Measurement of Nanoparticles from Engines

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A new dual type dma for the measurement of nanoparticles from engines

A New Dual-type DMA for the Measurement

of Nanoparticles from Engines

Kazuo Takeuchi1,2), Junsuke Yabumoto1,2), Yoshiki Okada1,2)

1) Wyckoff Co., Ltd., 2) RIKEN

Akio Kibayashi3)

3) Shimadzu Co.

Terunao Kawai4) and Yuichi Goto4)

4) NTSEL

1.Measurement of Gas-borne Nanoparticles

2.Calibration of Size Measurement

3.Difficulties in Conventional DMAs

4.Dual-type DMA as a Solution

5.Experiment

6.Conclusion

8th ETH CONF.

Zurich 8/16/04


A new dual type dma for the measurement of nanoparticles from engines

Measurement of Air-Borne Nanoparticles

Nanoparticles: 1 nm < dp < 300 nm


A new dual type dma for the measurement of nanoparticles from engines

Qsh

DMA

Sheath gas

Qae

Qex

Faraday Cup

Qsa

Electrometer

Differential Mobility Analyzer (DMA)

Electrical mobility of particles

Size distribution of particles

Dp: Particle diameter

Cc: Cunningham correction factor

m: Gas viscosity

np: Number of elementary charges on a particle

Size-selected particles

V

Size-selection of nanoparticles using DMA


A new dual type dma for the measurement of nanoparticles from engines

Number density

Diameter (nm)

Problem for Conventional DMAs in Automobile Exhaust Measurement

Typically, conventional DMAs need to scan the voltage for 2 minutes

Cannot cope with the quick transient behaviors in automobile exhaust

Typical particle size distribution of nanoparticles in engine exhaust

  • dual-type DMA with both

  • scanning measurement mode and

  • transient measurement mode

DMA with a multi-channel detector

Image reproduced from

D.B. Kittelson and W. Watts,

Third Joint ESF-NSF Symposium Abs.,

Dublin, Sept. 6 (2000).


A new dual type dma for the measurement of nanoparticles from engines

Dual-type DMA of Wyckoff

HV

Cover

Sheath gas inlet #1

Mobility analyzer #1

Central electrode

Aerosol gas inlet

Aerosol gas inlet

Common electrode

Sheath gas inlet #2

Mobility analyzer #2

LV

Housing

FC2

PA2

Excess gas outlet #1

Excess gas outlet #2

Base reservoir

FC1

PA1

Vacuum pump


A new dual type dma for the measurement of nanoparticles from engines

Features of the Dual-type DMA (DDMA)

  • The DDMA can be operated both in scanning measurement mode and in transient measurement mode.

  • In transient measurement mode, voltages are fixed at the peak values of the nuclei mode and the accumulation mode.

  • Particle number density can be obtained by assuming that the shape of the size distribution is unchanged.

  • DDMA can be operated with intentionally reduced resolution.


A new dual type dma for the measurement of nanoparticles from engines

Generation of model nanoparticles with bimodal size distribution


A new dual type dma for the measurement of nanoparticles from engines

7.0E+06

6.0E+06

5.0E+06

4.0E+06

PNC [#/cc]

3.0E+06

2.0E+06

1.0E+06

0.0E+00

1

10

100

1000

dp (nm)

非定常排気微粒子数濃度計測結果

DMA1

Model nanoparticles corresponding to nuclei mode

DMA2

Model nanoparticles corresponding to accumulation mode

Number density (#/cc)

Scanning Mode Measurement of Model Nanoparticles


A new dual type dma for the measurement of nanoparticles from engines

Transient Mode Measurement of Model Nanoparticles


A new dual type dma for the measurement of nanoparticles from engines

Measurement of nanoparticles from a Automobile Engine


A new dual type dma for the measurement of nanoparticles from engines

Concluding Remarks

  • We have introduced the dual-type DMA (DDMA) of Wyckoff.

  • The DDMA is simple and robust, and would be easy to use as a standard apparatus for the measurement of nanoparticles in automobile exhaust.

  • At the completion of this project, Shimadzu Co. will commercialize the DDMA and will be capable of large-scale production.

Acknowledgement: We would like to thank JRTT for financial support. We would also like to thank Dr. Montajir and the scientists and technicians of NTSEL, Wyckoff, RIKEN and Shimadzu for their technical support and advice.


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