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
Copyright Status
Unknown
Socpus ID
85056098202 (Scopus)
Source API URL
https://api.elsevier.com/content/abstract/scopus_id/85056098202
STARS Citation
Mehrvand, Mehrdad and Putnam, Shawn A., "Transient And Local Two-Phase Heat Transport At Macro-Scales To Nano-Scales" (2018). Scopus Export 2015-2019. 8445.
https://stars.library.ucf.edu/scopus2015/8445