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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

CAPILLARY EVAPORATION AND BOILING HEAT TRANSFER ON HYBRID WICKING STRUCTURES

Get access (open in a dialog) DOI: 10.1615/IHTC16.bae.023634
pages 1233-1239

Resumo

Thermal management of high power electronic systems is becoming critical in defense, space, and commercial applications. As a liquid-vapor phase-change process, capillary evaporation heat transfer on wicking structures has received increased interest owing to its potential to dissipate high heat flux by increasing effective heat transfer area and sustaining the liquid supply. However, the approaches based on capillary evaporation suffer from intrinsic tradeoffs between low thermal resistance for heat flow and high wicking flow rate for liquid supply, which makes it challenging to optimize both heat transfer coefficient (HTC) and critical heat flux (CHF) on the same wicking structure. Here, a cost-effective hybrid mesh wicking structure is presented to enhance capillary evaporation and boiling heat transfer. The interconnected channels between woven mesh layers and substrate serve as low flow resistance passages for high mass flow rate of the liquid. Moreover, the integration of nanograsses on mesh wires and substrate promotes the liquid supply for high CHF and HTC. High-performance capillary evaporation and boiling heat transfer are achieved on the hybrid mesh wicking structure with a 10 mm × 10 mm heated area. The insights gained from this study can guide the design of highly efficient wicking structures in heat pipes, vapor chambers, and other high heat flux thermal systems.