The thermal dielectrophoretic force on a dielectric particle in electric and temperature fields

摘要: Many microfluidic devices use an applied electric field to control and manipulate particles immersed in a fluid through the electrostatic force caused by dielectrophoresis (DEP). Additionally, electrothermal flow can be effects of nonuniform temperature temperature-dependent electrical permittivity conductivity material properties. We examine on particle subjected simultaneously find that experiences given not only classical dielectrophoresis, but also additional force, which we term thermal DEP. Assuming change background across is small, relative properties develop linearized model solve analytically integrate Maxwell stress tensor expression for DEP force. This proportional gradient, square strength, particle's volume. two special cases, one where gradient are aligned, second case they perpendicular each other. The general arbitrary angle found simply superposition these cases. compute fully-coupled system COMSOL determine range validity our show practical way superimpose forces total fluid. Due high common biological buffers, play important role when used cells or bacteria. may modify heat transfer rates nucleate boiling applications, large gradients present. Degree Type Dissertation Name Doctor Philosophy (PhD) Graduate Group Mechanical Engineering & Applied Mechanics First Advisor Howard H. Hu