RESTRICTED
Reference No.
G3.05
Research Conference. Canada - August, 1982
GRELDC Research Programme, 1982 1984
PROPOSED REVISIONS FOR 1983 1985
Work Area 05 Combustion
General
No major changes are planned in the Combustion Research Programme f or
1982 - 1984. The effort in computer modelling will be increased from
July, 1982, by a second-year undergraduate in chemical engineering who
will work in the Group for one year's industrial training.
The emphasis throughout is on understanding the various processes that
occur in and around the burning cigarette. The concepts developed will
be applied by other groups for specific product requirements.
Computer modelling is now a major part of the Combustion Group's total
effort and is seen as one of the principal routes by which the Group's
work can be applied to other areas. Several computer models are
currently under development: gas flow in the cigarette, combustion and
pyrolysis reaction kinetics, simplified burning cigarette, puff-by-puff
deliveries and sidestream generation. Some of these models are being
developed under contract by consultants at Bristol, Oxford and London
Universities, as well as a computer consultant firm in Southampton.
These external contacts will be maintained and possibly strengthened in
the future.
It was agreed at the 1982 Technical Exchange Meeting that an internal
SAT conference on the applications of computer modelling be held in
mid- 1983, planned jointly by GRGDC and Hamburg. Further details are
submitted separately to the Research Conference, for approval.
Programme Changes
Some changes in timing of the projects will occur: the development of
an axial diffusion/dispersion gas flow model (Project I (a)) and the
formation of nitric oxide (Project 4) will not begin until November,
1982.
As a result of preliminary studies, completed in 1982, on semi-volatile
smoke components, it is evident that many important flavour components
cannot be monitored without much more complex analytical procedures.
-onsequently, work on the release and transfer of nicotine and semi-
volatile components (Project 2) will continue an planned, but with more
emphasis on nicotine and lose on the other semi-volatiles.
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BATCo document for Province of British Columbia 19 April 1999

2
In the past year, investigations into the formation of sidestream smoke
(Project 7(b)) have concentrated on the mechanism by which magnesium
oxide filler in the cigarette paper produces low visible sidestream
smoke. To date, no satisfactory mechanism has been found, although
several hypotheses have been postulated. consequently, work on cigarette
paper/sidestream mechanism will continue well into 1983 and this work
will overlap with the planned projects on paper and paper additives
(Project 5). This basic approach to sidestream generation also overlaps
with the applied studies in Work Area 06. Thus there will be consider-
able interaction of the work in these areas and the Combustion Group.
Studies during 1982 have shown that the inclusion of expanded tobacco
in cigarettes increases the amounts of carbon monoxide formed in the
burning zone (part of Project 1(b)). Work in other areas has suggested
that the inclusion of shredded stem may decrease the levels of carbon
monoxide. Consequently, a new joint project with the Tobacco Expansion
Group (Work Area 12) will commence in September, 1982. The levels of
carbon monoxide formed in the burning zone of cigarettes containing
various treated stems will be determined and useful interactions of
expanded tobacco and shredded stem will be sought.
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BATCO document for Province of BritiSh COIUMbia 19 April 1999