Masters Theses

Keywords and Phrases

Radial Differential Mobility Analyzer (RDMA)


"Transfer function for Radial Differential Mobility Analyzer (RDMA) is found experimentally using the tandem Differential Mobility analyzer (DMA) setup. The performance of RDMA is evaluated in the size range of 13 nm to 100 nm. It has been shown that the transfer function of the RDMA broadens, thus loosing its classifying power, for aerosol particles with diameter less than 30 nm. The deterioration in the performance of the mobility analyzer is attributed to Brownian diffusion and space charge effects. Further, modifications in the geometry of RDMA and the mode of operation of the cylindrical DMA is suggested in order to minimize both the above effects and thus improve the performance of the DMA in the smaller size range (aerosol particles with diameter less than 30 nm).

In another project, inertial errors while sampling still aerosol, at high altitudes, has been analyzed. An appropriate model has been used clearly stating its limitations. It has been suggested that further analysis is required for a thorough understanding of the problem. It has been concluded, though, that the inertial enhancement effect can be safely neglected for aerosol particles with diameters smaller than 100 nm"--Abstract, page iii.


Xing, Yangchuan

Committee Member(s)

Whitefield, Philip D.
Hagen, Donald E.
Ludlow, Douglas K.


Chemical and Biochemical Engineering

Degree Name

M.S. in Chemical Engineering


United States. National Aeronautics and Space Administration


The author would like to acknowledge NASA, USA (National Aeronautics and Space Administration) for the financial support.


University of Missouri--Rolla

Publication Date

Fall 2005


x, 66 pages

Note about bibliography

Includes bibliographical references (pages 61-65).


© 2005 Prafull Subhash Gandhi, All rights reserved.

Document Type

Thesis - Restricted Access

File Type




Subject Headings

Aerosols -- Analysis
Dynamics of a particle
Transfer functions

Thesis Number

T 8887

Print OCLC #


Link to Catalog Record

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