New viscosity measurement technique by using rotational breakup of electrostatically levitated droplet

Levitated droplet dye laser.

We present the first observation, to our knowledge, of lasing from a levitated, dye droplet. The levitated droplets are created by computer controlled pico-liter dispensing into one of the nodes of a standing ultrasonic wave (100 kHz), where the droplet is trapped. The free hanging droplet forms a high quality optical resonator. Our 750 nL lasing droplets consist of Rhodamine 6G dissolved in et...

Fabrication and Control of an Electrostatically Levitated Rotating Gyro

There are significant efforts to develop gyroscopes using MEMS technology; accuracies of gyroscopes varying from rate-grade, through tactical-grade, to inertial grade. The random walk varies from 0.5 o /√h through 0.05 o /√h to 0.001 o /√h. The most common approach is to use vibratory gyros, which use mechanical elements (proof-mass) to sense the rotation. There are several types of vibratory g...

Low-Viscosity Measurement by Capillary Electromagnetically Spinning Technique

We study sphere rotation against viscous torque confined in a small space. Our new invention, the electromagnetically spinning sphere (EMS) viscometer measures liquid viscosity through the observation of sphere rotation driven by electromagnetic interaction in a noncontact manner. The lower limit of the measurable viscosity is determined from the ratio between the viscous torque and the mechani...

Simulation of Droplet Breakup by Dissipative Particle Dynamics (DPD)

Reduction of Parasitic Currents in Simulation of Droplet Secondary Breakup with Density Ratio Higher than 60 by InterDyMFoam