Investigating gyroid and primitive lattice structures for additively manufactured heat exchangers

Investigating gyroid and primitive lattice structures for additively manufactured heat exchangers

Investigating gyroid and primitive lattice structures for additively manufactured heat exchangers 150 150 Mathew
UKAEA-CCFE-PR(22)15

Investigating gyroid and primitive lattice structures for additively manufactured heat exchangers

Heat exchangers have manifold applications, from micro-electronics to nuclear fusion reactors. Their required performance expectations will continue to increase in line with the power consumption and miniaturisation of technology. Additive manufacturing enables the creation of novel, compact heat exchangers with greater surface-to-volume ratios and geometrical complexities than standard pin/fin arrays and pipes. Despite this, there has been little research into the use of surface-based lattice structures as heat exchangers. Here, the hydraulic and thermal performance of two surface-based lattice structures (the gyroid matrix and primitive matrix structures) were examined numerically. CFD data were used to obtain predictive models for pressure drop and volumetric heat transfer coefficients over a range of flow rates and volume fractions, which can henceforth be used as a guide for lattice designers. The surface-based lattices exhibited volumetric heat transfer coefficients up to an order of magnitude greater than that of a circular channel, and a correlation for volumetric Nusselt number was found that is directly analogous to that of foam structures. Lastly, examination of fluid flow and temperature revealed the primitive matrix lattice to be a poor candidate for heat management applications, as its large variation in internal channel diameter led to low levels of fluid mixing and inefficient use of the design space.

Collection:
Journals
Journal:
International Journal of Heat and Mass Transfer
Publisher:
Elsevier