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Forced Oscillations

Forced Oscillations

When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.

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Updated: May 28, 2026

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

Published on: August 21, 2018

Mass transfer from an oscillating microsphere.

Jiahua Zhu¹, Feng Zheng, Mary L Laucks

¹School of Chemical Engineering, Sichuan University, Chengdu, China.

Journal of Colloid and Interface Science

|November 18, 2005

Summary

This summary is machine-generated.

Oscillating aerocolloidal droplets show significantly enhanced evaporation rates, up to five times faster than static droplets. This mass transfer enhancement is linked to oscillation parameters and exceeds quasi-steady-flow predictions.

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Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Published on: January 28, 2022

Area of Science:

Fluid Dynamics
Mass Transfer
Aerocolloidal Science

Background:

Understanding mass transfer from oscillating droplets is crucial for various industrial and environmental processes.
Previous models often simplified droplet dynamics, potentially underestimating evaporation rates.

Purpose of the Study:

To quantify the enhancement of mass transfer during the evaporation of single oscillating aerocolloidal droplets.
To investigate the influence of oscillation frequency and amplitude on evaporation rates.
To develop a theoretical framework for oscillating droplet mass transfer.

Main Methods:

Utilized electrodynamic levitation to trap and oscillate single aerocolloidal droplets (approx. 40 micrometers).
Controlled droplet oscillation using AC and DC fields within an electrodynamic balance (EDB).
Employed elastic light scattering for precise droplet sizing during evaporation in nitrogen gas.

Main Results:

Observed evaporation rates up to five times higher for oscillating droplets compared to stagnant conditions.
Demonstrated that mass transfer is governed by an oscillation Peclet number and a dimensionless oscillation parameter.
The measured enhancement significantly surpassed predictions from quasi-steady-flow mass transfer models.

Conclusions:

Oscillating aerocolloidal droplets exhibit significantly enhanced mass transfer rates.
The study provides a new framework incorporating oscillation dynamics to accurately predict mass transfer.
Findings have implications for optimizing processes involving droplet evaporation and aerosol behavior.