Size-resolved particle reduction effectiveness (ei) evaluated for front burner vs.
back burner: (a) range hood flow rate of 100 m3/h (Hood A); (b) range hood flow rate
of 370 m3/h (Hood B). Error bars represent standard error from the mean based on repetition
tests.
the particle laden plume and the exhaust hood is different between
the back and front burners. The exhaust hood appears to entrain a
smaller portion of the plume from the front burner, suggesting that
at the same hood flow rate, using the back burner is more effective
in reducing particles than the front burner. This observation is similar
to that seen by Singer et al. (2011a, 2011b) who observed higher capture
efficiencies for back burners of combustion-related contaminants
(using CO2 as a marker).
Reduction effectiveness is generally lower for smaller particles.
Two factors may contribute to this trend. First, the strong molecular
and turbulent diffusion of smaller particles could cause particles to
migrate out of the air stream that is flowing towards the exhaust.