Boiling Heat Transfer Mechanisms in Enhanced Surfaces

Boiling heat transfer on engineered surfaces relies on the controlled formation, growth and departure of vapour bubbles at the solid–liquid interface. Surface micro- and nanostructures can tailor wettability and capillary forces to promote high nucleation-site density, rapid liquid replenishment and stable rewetting, thereby boosting both the heat transfer coefficient and critical heat flux. Wettability patterns—from superhydrophilic to superhydrophobic regions—allow for precise tuning of bubble nucleation, coalescence and detachment. Textured surfaces alter local thermal gradients and hydrodynamics, creating alternating dry and wetted patches whose rewetting kinetics govern the onset of boiling crisis. Optimising the size, pitch and hierarchical arrangement of cavities and channels yields global performance gains in power-plant boilers, electronic cooling modules and compact heat exchangers. The unification of mechanistic understanding with scalable fabrication methods now enables surfaces that reconcile the traditional trade-off between nucleate boiling efficiency and maximum sustainable heat flux.

Research from Nature Portfolio

Recent studies have revealed a unifying criterion for the boiling crisis that emerges from a percolation-like instability in near-wall bubble interactions. A multidimensional surface formed by nucleation-site density, average bubble footprint radius and the product of growth time and detachment frequency defines the transition to film boiling, offering a predictive tool for surface design. Complementary work on liquid-vapour dynamics has uncovered that critical heat flux does not increase monotonically with texture density but instead exhibits a maximum at intermediate densities. High-speed imaging combined with thermal modelling has linked this maximum to coupled dry-spot heating and gravity- or capillary-driven rewetting timescales. Another line of investigation has demonstrated a scalable laser-based microstructuring method that produces multimodal cavity sizes (0.2–10 µm) compatible with both polar and non-polar fluids. These surfaces maintain robust multi-scale wettability and enable controlled nucleate boiling across diverse liquids, highlighting a versatile pathway to industrial applications.

Boiling Heat Transfer Mechanisms in Enhanced Surfaces publication trend

The graph below shows the total number of articles in boiling heat transfer mechanisms in enhanced surfaces across all publications each year (not limited to Nature Index journals).

Technical terms

Nucleate boiling: The regime in which vapour bubbles form at discrete surface sites, grow, and detach, leading to efficient heat removal.

Critical heat flux (CHF): The maximum heat flux at which a surface can sustain nucleate boiling before transition to film boiling causes a sudden drop in heat transfer.

Heat transfer coefficient (HTC): A measure of the convective heat transfer rate per unit area per unit temperature difference between the surface and fluid.

Wettability: The tendency of a liquid to spread on or adhere to a solid surface, typically characterised by the static contact angle.

Dry-spot rewetting: The process by which liquid returns to previously vapour-covered regions of a heated surface, crucial for preventing burnout.

Capillary wicking: The spontaneous movement of liquid through micro- or nano-structured channels driven by surface tension forces.

References

1. A unifying criterion of the boiling crisis. Nature Communications (2023).
2. Critical heat flux maxima during boiling crisis on textured surfaces. Nature Communications (2015).
3. Scalable Surface Microstructuring by a Fiber Laser for Controlled Nucleate Boiling Performance of High- and Low-Surface-Tension Fluids. Scientific Reports (2018).
4. Superbiphilic Laser‐Microengineered Surfaces with A Self‐Assembled Monolayer Coating for Exceptional Boiling Performance. Advanced Functional Materials (2023).
5. Three‐Tier Hierarchical Structures for Extreme Pool Boiling Heat Transfer Performance. Advanced Materials (2022).
6. Pattern geometry optimization on superbiphilic aluminum surfaces for enhanced pool boiling heat transfer. International Journal of Heat and Mass Transfer (2020).