UNCLASSIFIED
ORNL - 1414
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TEEORY OF A DIFFUSION BATTERY.
Wendell DeMarcus and Jess W. Thomas, 16 October 1952.
UNCLASSIFIED
(u)
A diffusion battery consists of a number of long, narrow >
rectangular channels arranged in parallel, through which an aerosol
moves in streamline flow. The object of the work described was ta
develop an equation relating fractional penetration of aerosol with
the diffusion constant of the aerosol.
An equation has been developed.
Also a method is given for the
calculation of the particle size and mass from the diffusion constant and
the settling velocity.
ORNL - 1648
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THE DIFFUSION BATTERY METHOD FOR AEROSOL PARTICLE SIZE
DiTERMINATION.
Jess W. Thomas, 5 January 1954.
UNCLASSIFIED
(u)
The object of the work described in this report was to design and
construct several diffusion batteries and tq investigate the validity of
the diffision method for size determination of sub-micron homogeneous
aerosols.
Two perallel-plate diffusion batteries were fabricated and used
for particle size readings in the 0.1 uy radius range.
The aerosol particle
size as determined by the batteries was compared with the size as determined
by a standard light-scattering method. The results agreed within 30%.
Circular-tube batteries were fabricated and used to check the
applicability of the method to diffusion of particles as small as gas
molecules.
The diffusion coefficients of gas molecules obtained by the
batteries agreed closely with the literature values.
It was concluded that the diffusion battery is a valuable
instrument for study of the particle size of aerosols from atomic size
up to particle redii of about 0.5 p. Two batteries, with graphs of
operating parameters, are now available for use in filter efficiency
studies.
ORNL - 1655
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CLOUD CHAMBERS FOR MEASURING THE PARTICLE DENSITY OF AN
AEROSOL.
Bernard G. Saunders, 19 February 1954.
UNCLASSIFIED
(u)}.
This report summarizes the work performed in setting up and
UNCLASSIFIED
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eo
pra!
calibrating a continuous-action cloud chamber which determines the number
of- particles in a unit volume of aerosol.