Thermal Performance of Hollow Fluid-Filled Heat Sinks

John Nuszkowski (), David Trosclair, Calla Taylor and Stephen Stagon
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John Nuszkowski: School of Engineering, University of North Florida, Jacksonville, FL 32224, USA
David Trosclair: School of Engineering, University of North Florida, Jacksonville, FL 32224, USA
Calla Taylor: School of Engineering, University of North Florida, Jacksonville, FL 32224, USA
Stephen Stagon: School of Engineering, University of North Florida, Jacksonville, FL 32224, USA

Energies, 2025, vol. 18, issue 7, 1-13

Abstract: The increasing power density of electronic devices drives the need for lighter, more compact heat dissipation devices. This research determines whether a hollow heat sink filled with fluid outperforms solid heat sinks for heat dissipation. Research on the integration of a heat spreader, heat pipe, and finned heat sink as a single component is limited. The copper and aluminum heat sinks consisted of a 4 × 4 fin array with a volume of 44.5 × 44.5 × 44.5 mm 3 . The working fluids were water and acetone with a 50% fill volume for the hollow copper and aluminum heat sinks, respectively. Each was tested at nine operating points (varying applied heats and air velocities). The hollow copper heat sink had similar overall heat sink thermal resistance while the hollow aluminum increased by 8% when compared to the solid copper heat sink, and the hollow heat sinks had a 2–9% lower fin array thermal resistance. The weight was reduced by 82% and the mass-based thermal resistance was 77% lower than the solid copper heat sink for the hollow aluminum heat sink. The considerable decrease in mass without significant loss in thermal resistance demonstrates the potential widespread application across technologies requiring low-weight components. In addition, the hollow heat sink design provides comparable or superior thermal performance to previous flat heat pipe solutions.

Keywords: heat sink; heat pipe; thermosyphon; heat spreader; thermal resistance; electronics cooling (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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