title: A traveling-wave micropump for aqueous solutions: comparison of 1 g and microgram results.
abstract: The operation of a micro-chip-based fluid circulator based on the interaction of a high-frequency traveling wave with a thermally generated inhomogeneity in an aqueous medium is investigated. The profiles of the electric field, the thermal gradient and the driving force within the device are derived numerically, and the dependence upon applied voltage under different experimental conditions is derived. The importance of convection in the operation of the device is assessed by operating it in various orientations, as well as under microgravity, and also by investigating the reversal and turn-on characteristics. The pump showed the unexpected ability to trap microparticles present in the driven fluid.
authors.affiliation: FB Biologie, Humboldt-Universität zu Berlin, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Müller
authors.forename: W M
authors.initials: WM
authors.lastname: Arnold
authors.forename: T
authors.initials: T
authors.lastname: Schnelle
authors.forename: R
authors.initials: R
authors.lastname: Hagedorn
authors.forename: G
authors.initials: G
authors.lastname: Fuhr
authors.forename: U
authors.initials: U
authors.lastname: Zimmermann
mesh_terms: D004560:Electricity; D004586:Electrophoresis / Q000295:instrumentation* / Q000379:methods; D006112:Gravitation; D008839:Microelectrodes; D012996:Solutions; D014867:Water
chemical_list: D012996:Solutions; D014867:Water