Transient And Local Two-Phase Heat Transport At Macro-Scales To Nano-Scales

Abstract

Two-phase cooling has become a promising method for improving the sustainability and efficiency of high energy-density and power-density devices. Fundamentally, however, two-phase thermal transport is not well understood for local, transient processes, especially at critical to near-critical heat fluxes at the macro, micro, and nano-scales. Here we report spatiotemporal characterization of the single-bubble ebullition cycle in a hot-spot heating configuration with heat fluxes approaching 3 kW cm−2. In particular, we experimentally reconstruct the spatiotemporal heat transfer coefficient in terms of its proportionality at both the macro-scale (l >> 1 μm) and the micro-to-nanoscale (l < 1 μm). We show that the maximum rates of heat transfer occur during the microlayer evaporation stage of the ebullition cycle, corresponding to critical maxima in the heat transfer coefficient of ~160 ± 40 kW m−2 K−1 and ~5300 ± 300 kW m−2 K−1 at the macro-scale and micro-to-nanoscale, respectively.

Publication Date

12-1-2018

Publication Title

Communications Physics

Volume

1

Issue

1

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1038/s42005-018-0018-3

Socpus ID

85056098202 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85056098202

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