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A Suggested Spray Data Exchange Format

Objective: To provide scientists with a standardised format for archiving spray droplet data and transferring data to/from computer programs and routines, for further comparison and analysis.

Scientists at IPARC have been collecting data on nozzle performance for nearly half a century and have retained electronic data gathered over the past 15 years. This database system, as it stands, reflects droplet sizing techniques that have been historically used in IPARC; should there be any interest in developing a standardised data format, this can be developed further. The programme DROPDATA has been developed for this purpose.

Droplet number count data can be entered in a form where are arranged in size classes. Percentage volume data, such as that produced by the 'Malvern', can be processed. The majority of data available has been obtained with a 2600 instrument, with 'model independent' analysis.

Keyboard entry on the DROPDATA program follows a simple question and answer routine; alternatively the data can be prepared with a text editor word processor (saved as ASCII text with the filename extension *.ARD) . The separation of numbers within a line is not strict: any characters that are not (i) numerical digits, (ii) reserved characters (see below) or (iii) the characters: E,M,.,+,-, may be used. Most users will prefer tabs, commas or spaces.

The format used for EACH READING are as follows:

Line 1: for economy of space, a single character is used to indicate the method of droplet analysis; three example (most commonly used for manual input) are:

Lines 2-4: labels for each data set. Up to 255 characters (including 2 carriage returns) can be accepted. A suggested format for standardising on labels might be:

Line 5: four ordinal numbers used as flags by the programme:

i. a number of type byte (0..255) which is unique to each data set in the file
(i.e. a reading number).

ii.-iv. three configuration flags (see table).

Line 6: four real number parameters (of decimal point format) used by the program:

i. a calibration number: e.g. focal length of lens, upper size of the highest droplet size class, the distance between the Z(ero) line and maximum on a graticule

ii.-iv. Three parameters depending on instrument (see table)

Line 7: ALL size classes, starting with the LARGEST size, going DOWNWARDS.

Format for DROPDATA flags and parameters

Instrument

Flags

Parameters

1

2

3

4

1

2

3

4

check symbol

Flag1 is reading number in data group

Number of size classes

Malvern type:

data flag:

1800

#

0

unused

unused

16

Focal length of lens

unused

unused

Error

*

Rosin Rammler
(* 1800 only):

Focal length of lens

PE

W

Error

2200

0

unused

unused

16

Focal length of lens

Obscuration

unused

Error (log)

2600

|

0

killed data (low)

killed data (high)

32

Focal length of lens

Obscuration

VMD

Error (log)

Optical instruments
(
Ö 2 size classes)

Spread factor:

Porton graticule

!

1

1: old

0: 0: no spread

13

calibration*

1

unused

unused

1

2: new

1: MgO

14

calibration*

0.86

unused

unused

Flemming

1

3: Flm.

2: other spread factor

10

calibration*

const 1

unused

unused

3: variable spread factor

calibration*

regression equation type

a(x)

b

AIMS:

@

1

4

1: water

13

Exposure time (s)

Air speed

wire calibration

unused

2: oil

14

or unused

Instrument type switches (internal) data distribution flag:
0: cumulative volumes
1: number of droplets in size classes

*: Distance between Z line and maximum