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Mechanisms of Heat Transfer II01:20

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In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...
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Customised spatiotemporal temperature gradients created by a liquid metal enabled vortex generator.

Jiu Yang Zhu1, Peter Thurgood, Ngan Nguyen

  • 1School of Engineering, RMIT University, Melbourne, Victoria 3001, Australia. Khashayar.khoshmanesh@rmit.edu.au.

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Summary

Researchers developed a novel liquid metal pump to create controlled vortices in miniaturized chambers, enabling precise temperature gradients for material and biological studies.

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Area of Science:

  • Microfluidics
  • Fluid Dynamics
  • Thermal Engineering

Background:

  • Miniaturized flow-free liquid chambers face challenges in generating custom temperature gradients due to diffusion dominance.
  • Conventional actuators for inducing internal flows (vortices) in such chambers are difficult to fabricate, integrate, and maintain.

Purpose of the Study:

  • To develop an effective and easily manageable method for creating customized spatial and spatiotemporal temperature gradients in miniaturized liquid chambers.
  • To overcome the limitations of diffusion and actuator complexity in microfluidic temperature control.

Main Methods:

  • Utilized liquid metal enabled pumps to generate and control vortices within a miniaturized liquid chamber.
  • Adjusted vortex configuration and rotational velocity by tuning the polarity and frequency of the electrical signal.
  • Demonstrated rapid reconfiguration of vortices for dynamic temperature profile transitions.

Main Results:

  • Successfully created customized spatial temperature gradients by controlling liquid metal induced vortices.
  • Achieved rapid temperature oscillations (35-62 °C at hot spot, 25-27 °C at vortex center) within 15 seconds.
  • Demonstrated easy fabrication, integration, and operation of the liquid metal vortex generator.

Conclusions:

  • Liquid metal enabled pumps offer a facile and effective solution for generating controlled vortices and customized temperature gradients in microfluidic devices.
  • The system allows for rapid creation of spatiotemporal temperature gradients, beneficial for studying thermo-responsive materials and biological samples.
  • This technology presents a promising advancement for microfluidic applications requiring precise thermal control.