title: Effect of swirling desolvation gas flow in an atmospheric pressure ion source.
abstract: A numerical study is performed to examine the effect of introducing a swirling desolvation gas flow on the flow transport characteristics in an electrospray and an atmospheric pressure chemical ionization (APCI) system. An ion source having three coaxial tubes is considered: (1) an inner capillary tube to inject the liquid sample, (2) a center coaxial tube to provide a room temperature gas flow to nebulize the liquid, referred to as the nebulizing gas flow, and (3) an outer coaxial tube having a converging exit to supply a high temperature gas for droplet desolvation, referred to as the desolvation gas flow. The results show that a swirling desolvation gas flow reduces the dispersion of the nebulizing gas and suppresses turbulent diffusion. The effect of swirling desolvation flow on the trajectory of a range of droplet sizes emitted from a source is also considered.
authors.affiliation: Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON, M5S-3G8, Canada.
authors.forename: Serguei
authors.initials: S
authors.lastname: Savtchenko
authors.forename: Nasser
authors.initials: N
authors.lastname: Ashgriz
authors.forename: Chuck
authors.initials: C
authors.lastname: Jolliffe
authors.forename: Lisa
authors.initials: L
authors.lastname: Cousins
authors.forename: Heather
authors.initials: H
authors.lastname: Gamble