Viscous Dissipation Effect of Liquid Flow in Microtubes

Viscous dissipation effects on de-ionized ultra pure water flow through smooth quartz glass microtubes with different inner diameters are investigated numerically and experimentally as the Reynolds number varies in the range from 0 to 700. In present study, a 2-D model adapted to microtube is presented to analyze the viscous dissipation characteristic in microtube considering EDL effect. According to the numerical simulation results, a new criterion Vc demonstrating the law of the viscous dissipation in microtube is summed up in this paper. Based on the micro-area thermal-imaging technology and a series of correction tests, the viscous heating temperature rise in microtube can be exactly measured by an IR camera with a special magnifying lens. Moreover, the temperature rise of the working fluid resulted from the heat generated by the pump is also considered in present experiments. The experimental results are compared with predictions of the numerical simulation and the theoretical Vc correlation. The comparisons indicate that the experimental data are in accordance with numerical and theoretical results.