For the same volume of coolant, using a phase change — boiling (liquid to gas) or condensation (gas to liquid) — removes far more heat than single-phase cooling alone. Phase-change heat transfer sits at the core of cooling technology for high-density electronics.

Why Phase-Change Heat Transfer

The latent heat absorbed when water evaporates is far greater than the sensible heat needed to raise its temperature by one degree. Deliberately inducing boiling at a heat source’s surface therefore allows a much higher heat flux to be handled with the same flow rate — particularly advantageous for cooling devices like GPUs or power semiconductors where heat is concentrated in a small area.

Key Metrics in Boiling Experiments

  • Critical Heat Flux (CHF): The point at which the surface becomes covered by a vapor film and cooling performance drops sharply. Experimentally raising the CHF directly translates to raising a system’s maximum heat-dissipation capacity.
  • Wall Superheat: The difference between surface temperature and saturation temperature. A smaller value means more heat can be removed with less temperature rise.

Forming nano/micro porous structures on a surface increases the number of nucleation sites and improves capillary-driven liquid supply, allowing a higher heat flux to be handled at the same wall superheat.

Visualization Techniques

Because phase change is a visible phenomenon, optical instrumentation is a particularly powerful tool.

  1. High-speed camera visualization: Captures bubble nucleation, growth, and departure at high speed to analyze the boiling mechanism.
  2. Infrared (IR) thermal imaging: Maps surface temperature distribution in real time to identify localized dry spots.
  3. Optical reflection/transmission measurement: Setups using gold mirrors and beam splitters precisely track bubble shape and interfacial behavior.

FRIGUSON’s Approach

Building on our phase-change heat transfer (boiling/condensation) optimization technology and nano/micro surface fabrication capability, FRIGUSON designs flow paths and surface structures inside Cold Plates to promote efficient phase-change heat transfer. If your university or research lab needs a similar phase-change heat transfer experimental setup, our Lab Solutions service can help build it together with you.