| Summary: | 碩士 === 國立屏東科技大學 === 車輛工程系碩士班 === 94 === This paper uses the numerical simulation to discuss the phenomena that micromixer System only apply electricity to drive the sampling liquids and periodic changing frequency occurs simultaneously. Micromixer System produce unstable fluent field in micro tube without additional power supply, and apply periodic changing mode to start cross sampling injection .Upper method can increase the contacting area and time between two samples, and promotes the mixing effect of micro scale. Furthermore, changing the geometric shape greaten the swing level of the fluid, and increase the contacting area between different samples.
In addition, while changing the geometric shape and voltage in research, we find another problem which is joule heating effect. Following situations have to check simultaneously, including changing the heat transfer coefficient of the straight tube、level of the driving voltage、width of the tube inside diameter、crinkling or bending tube、differences of the heat transfer coefficient (including crinkling tube)、interdependent conductance of fluid and temperature in micro tube、temperature field of heat conductivity and viscosity、geometric shape、electric field and fluid field. Higher temperature makes lower viscosity and higher electroosmotic flow. When gradient (high temperature at center) of the temperature occurs, the creating joule heat makes the distribution of the temperature of the fluid field unequal, and the conductance、viscosity interdependent with the temperature will change the whole electric field and fluid field.
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