Pool Boiling of NOVEC-649 on Microparticle-Coated and Nanoparticle-Coated Surfaces

Zhen Cao, Zan Wu, Bengt Sundén

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, microparticle coatings and nanoparticle coatings were fabricated on copper surfaces by an electrochemical deposition method and an electrophoretic deposition method, respectively. Pool boiling of NOVEC-649 was experimentally studied on the coated surfaces, concerning heat transfer, bubble dynamics, and critical heat fluxes. Compared with a smooth surface, heat transfer coefficients and critical heat flux (CHF) were improved, achieving a maximum heat transfer enhancement of 460% on the nanoparticle-coated surface and a maximum CHF enhancement of 60% on the microparticle-coated surface. Based on high speed visualizations, bubble departure diameters were measured and compared with several correlations, and then the heat transfer was analyzed by a mechanistic model, considering natural convection, transient heat conduction and microlayer evaporation. The mechanistic model demonstrated a good ability to predict the present results. In addition, wickability, representing a liquid supplement ability, was measured, indicating that the wickability enhancement was probably responsible for the CHF improvement.

Original languageEnglish
Pages (from-to)1732-1747
JournalHeat Transfer Engineering
Volume42
Issue number19-20
Early online date2020
DOIs
Publication statusPublished - 2021

Subject classification (UKÄ)

  • Nano Technology

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