Additive Manufacturing of Heat Transfer Devices

Additive manufacturing has emerged as a transformative approach for the fabrication of heat transfer devices, enabling unprecedented freedom in geometrical design and integration of internal features. By building components layer by layer directly from digital models, complex structures such as conformal cooling channels, lattice-enhanced heat sinks and integrated manifolds can be realised without the constraints of conventional subtractive or formative processes. The capacity to produce fine features and freeform internal passages allows engineers to tailor surface area, flow paths and thermal resistance to precise application requirements. Across sectors ranging from aerospace to electronics cooling, additive techniques have delivered devices that are lighter, more compact and capable of higher heat fluxes than their traditionally manufactured counterparts. Key enablers include advances in metal powder processing, high‐precision laser systems, and improved process control, which together permit reliable fabrication of small channels and thin walls. Computational tools such as topological optimisation and computational fluid dynamics are routinely coupled with additive platforms to explore performance trade‐offs and refine designs for manufacturability. Post‐processing methods including heat treatment, surface finishing and protective coatings further extend the operational envelope of printed heat exchangers, heat pipes and oscillating thermal devices. By marrying design complexity with material versatility, additive manufacturing is redefining the limits of what is possible in thermal management and energy conversion applications.

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Additive Manufacturing of Heat Transfer Devices publication trend

The graph below shows the total number of articles in additive manufacturing of heat transfer devices across all publications each year (not limited to Nature Index journals).

Technical terms

Additive manufacturing: A layer-by-layer production technique that builds three-dimensional parts directly from digital designs.

Heat exchanger: A device that transfers thermal energy between two or more fluids without mixing them.

Laser powder bed fusion: An additive process where a laser selectively fuses metal powder to form solid structures.

Selective laser melting: A powder-based AM method that fully melts metal particles to create dense, load-bearing components.

Topological optimisation: A computational design approach that optimises material layout within a given space for performance criteria.

Heat pipe: A passive thermal transport device that uses phase change and capillary action within a sealed wick structure to move heat efficiently.

Microchannel: A fluid passage with characteristic dimensions on the order of tens to hundreds of micrometres, offering high surface‐to‐volume ratios for heat transfer.

References

1. Additive manufacturing of heat exchangers in aerospace applications: a review. Applied Thermal Engineering (2023).
2. SLM Additive Manufacturing of Oscillating Heat Pipe. Sustainability (2023).
3. Enhancement of friction factors for microchannels fabricated using laser powder directed energy deposition. Materials & Design (2025).