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Enhanced thermal radiation via interweaved L slots.

Mahmoud Elzouka, Sidy Ndao

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    |May 5, 2019
    PubMed
    Summary

    Researchers enhanced thermal radiation exchange by increasing electromagnetic energy channels. Carving slots in emitters significantly boosted heat transfer rates in both near- and far-field scenarios.

    Area of Science:

    • Physics
    • Thermodynamics
    • Nanotechnology

    Background:

    • Thermal radiation heat transfer depends on the number and capacity of electromagnetic energy channels.
    • Enhancing these channels can improve both near-field and far-field thermal radiation exchange.
    • Optimizing emitter geometry is key to maximizing heat transfer efficiency.

    Purpose of the Study:

    • To investigate methods for increasing the number of thermal radiation channels within a given emitter volume.
    • To quantify the enhancement in thermal radiation exchange achieved by modifying emitter geometry.
    • To compare the performance of different slot designs for thermal radiation enhancement.

    Main Methods:

    • Utilizing modified finite-difference time-domain (FDTD) simulations to model heat transfer.

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  • Designing emitters with carved slots of various sizes to increase channel density.
  • Comparing heat transfer rates for interweaved L slots, straight slots, and flat slabs of identical volumes.

    • Main Results:

    • Interweaved L slots demonstrated significantly higher thermal radiation rates compared to flat slabs and straight slots.
    • Far-field thermal radiation (30 μm gap) was enhanced by 15 times over flat slabs and 2.5 times over straight slots.
    • Near-field thermal radiation (0.5 μm gap) showed enhancements of 5.67 and 1.15 times over flat slabs and straight slots, respectively.

    Conclusions:

    • Carving slots is an effective strategy to increase the number of thermal radiation channels.
    • Geometric modifications of emitters can substantially enhance both near- and far-field thermal radiation exchange.
    • Interweaved L slot designs offer superior performance for thermal radiation heat transfer applications.