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Structure of high-performance evaporators for space application.

Haruhiko Ohta1, Yasuhisa Shinmoto, Toshiyuki Mizukoshi

  • 1Department of Aeronautics and Astronautics, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0359, Japan. ohta@aero.kyushu-u.ac.jp

Annals of the New York Academy of Sciences
|November 25, 2006
PubMed
Summary

A novel cold plate design enhances critical heat flux (CHF) by 2.5 times at low flow rates. This innovation is crucial for improving cooling efficiency in laser solar power systems.

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Area of Science:

  • Heat Transfer
  • Fluid Dynamics
  • Thermal Management

Background:

  • Efficient cooling is vital for high-power systems like laser solar power.
  • Existing cold plate designs face limitations in critical heat flux (CHF) under demanding conditions.
  • Narrow channel heat sinks are being explored for compact thermal management solutions.

Purpose of the Study:

  • To investigate a new cold plate structure for increasing critical heat flux (CHF).
  • To evaluate the performance of this novel design for laser solar power applications.
  • To propose a new method for evaluating cold plate performance considering various operational parameters.

Main Methods:

  • Experimental testing of a cold plate with an auxiliary liquid supply channel.
  • Utilizing water as the test fluid in narrow channels (5 mm and 2 mm gap sizes).

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  • Varying inlet liquid velocity (0.065–0.6 m/s) and measuring CHF under specified subcooling and pressure.

    • Main Results:

    • The new cold plate structure achieved CHF values up to 2.2 x 10^6 W/m^2.
    • At low flow rates, CHF was enhanced by 2.5 times compared to conventional designs.
    • The proposed performance evaluation method accounts for heating surface area, velocity, and subcooling variations.

    Conclusions:

    • The tested cold plate structure significantly increases critical heat flux.
    • The design is validated as effective for enhancing cooling performance in high-heat-flux applications.
    • The proposed evaluation method provides a comprehensive approach to assess cold plate performance.