Flow pattern and heat transfer in a cylindrical annulus under 1g and low-g conditions: Experiments
(2017)
Effect of the Initial Conditions on the Growth of Thermoelectric Instabilities During Parabolic
(2019)
Flow control of thermal convection using thermo electro hydrodynamic forces in a cylindrical annulus
(2019)
Flow Pattern and Heat Transfer in a Cylindrical Annulus Under 1 g and Low-g Conditions: Experiments
(2018)
Proof of concept of an air-coupled electrostatic ultrasonic transducer based on lateral motion
(2022)
An alternative implementation of an electrostatic MUT (Micromachined Ultrasonic Transducer), relying on multiple beams that displace along the chip’s surface instead of a single membrane displacing perpendicular to it, is presented in this work. With this approach, a design requiring a low bias voltage (24 V) and occupying a small area (3.3×3.3 mm², 2D/λ≈0.77) was shown to generate a sound pressure level of 82 dB (re. 20 µPa-rms) at 40 kHz and a distance of 8.9 cm. The high level of damping allows this transducer to operate in a wide frequency range (35-63 kHz). The operation of this device as an ultrasonic receiver was also proven. An implementation of this transducer as a rangefinder requires a strong reduction in the noise level, particularly coming from radio-frequency interference, in order to increase its detection range.