AVS 57th International Symposium & Exhibition
    Advanced Surface Engineering Tuesday Sessions
       Session SE-TuA

Paper SE-TuA12
Heat Transport at Water Interfaces in the Proximity of Micro- and Nano-Structured Surfaces

Tuesday, October 19, 2010, 5:40 pm, Room Cimmaron

Session: Surface Engineering for Thermal Management
Presenter: S.A. Putnam, Wright Patterson Air Force Base
Authors: S.A. Putnam, Wright Patterson Air Force Base
J.G. Jones, Wright Patterson Air Force Base
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Breakthroughs in many of today’s advanced technologies depend on the ability to reliably dissipate enormous amounts of thermal energy (heat) from very small areas. The most demanding applications are managed with nucleate boiling-based cooling schemes (e.g. spray cooling, heat pipes, thermosyphons, flow boiling, and jet impingement ), where the cooling effectiveness is dictated by both the cooling configuration and the coolant itself. Surface features can also play a crucial role in boiling/cooling processes because they can, for example, i) increase the total wettable surface area, 2) control the bubble nucleation dynamics at the surface (e.g. vapor bubble release rate and size), and iii) change the effective surface energy (i.e., the intrinsic driving mechanism for wetting the hot surface with a coolant). Here we present our studies on thermal transport at liquid interfaces, focusing on 1) our recent experimental data and corresponding numerical simulations of water microdroplets evaporating, wetting, and bouncing on micro- and nano-structured surfaces and 2) our time-domain thermoreflectance (TDTR) experiments for the interfacial thermal conductance (G) of evaporating water microdroplets on aluminum thin-films as a function of surface temperature.