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Standing Waves in a Cavity

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:

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Related Experiment Video

Updated: Sep 10, 2025

Flow-assisted Dielectrophoresis: A Low Cost Method for the Fabrication of High Performance Solution-processable Nanowire Devices

Flow-assisted Dielectrophoresis: A Low Cost Method for the Fabrication of High Performance Solution-processable Nanowire Devices

Published on: December 7, 2017

Suppressing Density-Wave Oscillation during Dielectric-Fluid Flow Boiling Using Nanowires.

Harsh Shah¹, Vijay Kumar¹, Yangying Zhu¹

¹Department of Mechanical Engineering, University of California─Santa Barbara (UCSB), Santa Barbara, California 93106, United States.

|August 25, 2025

Summary

This summary is machine-generated.

Nanowire surfaces in microchannels stabilize two-phase flow for electronics cooling. This technology suppresses flow instabilities and enhances heat transfer using dielectric fluids like Opteon SF33.

Keywords:

Si nanowires density-wave oscillation dielectric fluids microchannel flow boiling

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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:

Thermal management
Microfluidics
Two-phase flow

Background:

Flow instabilities like pressure-drop oscillations challenge microchannel cooling for high-heat-flux electronics.
Surface modifications are explored to mitigate these instabilities, but data for dielectric fluids is limited.

Purpose of the Study:

To investigate the impact of nanowire surface morphology on flow instabilities and heat transfer in microchannels using a dielectric fluid.
To assess the potential of nanowire surfaces for reliable thermal management in electronic devices.

Main Methods:

Fabrication of microchannels with nanowire surface structures.
Experimental investigation of two-phase flow boiling using Opteon SF33.
Analysis of pressure drop, flow rate, and heat transfer characteristics under varying heat fluxes.

Main Results:

The nanowire microchannel significantly suppressed density-wave oscillations.
Mass-flux and pressure-drop oscillations were reduced in amplitude and frequency.
Heat transfer coefficient was enhanced compared to standard surfaces.
Stable annular flow was observed due to improved surface wettability.

Conclusions:

Nanowire surface morphology is effective in stabilizing two-phase flow instabilities in microchannels.
This approach enhances thermal performance and reliability for electronics cooling with dielectric fluids.
The findings support the use of engineered surfaces for advanced thermal management solutions.