Abstract
The viscosity is one of the very important thermophysical properties for food industry and it is required to develop a new technique which is possible to measure significantly changing viscosity by single apparatus. In the present study, we have developed a new viscometry based on a laser-induced capillary wave technique by using a pulsed CO2 laser as a heating source. The detected signals for several Newtonian liquids such as acetone, toluene, water, ethanol, 1-hexanol, decanol, ethylene glycol, glycerol, JS 100, JS 1000 and JS 14000 having wide range of the viscosity (10-1-104 mPa·s) agreed well with the theoretical calculations. It is also confirmed that in the viscosity range 101-103 mPa·s, the viscosity can be determined by calculating decay time constant of detected signals. We have demonstrated that the application of the laser-induced capillary wave technique has considerable potential for the measurement from low to high viscosity liquids.
