When droplets coalesce on a superhydrophobic nanostructured surface, the resulting droplet can jump from the surface due to the release of excess surface energy. If designed properly, these superhydrophobic nanostructured surfaces can not only allow for easy droplet removal at micrometric length scales during condensation but also promise to enhance heat transfer performance. However, the rationale for the design of an ideal nanostructured surface as well as heat transfer experiments demonstrating the advantage of this jumping behavior are lacking. Here, we show that silanized copper oxide surfaces created via a simple fabrication method can achieve highly efficient jumping-droplet condensation heat transfer. We experimentally demonstrated a 25% higher overall heat flux and 30% higher condensation heat transfer coefficient compared to state-of-the-art hydrophobic condensing surfaces at low supersaturations (<1.12). This work not only shows significant condensation heat transfer enhancement but also promises a low cost and scalable approach to increase efficiency for applications such as atmospheric water harvesting and dehumidification. Furthermore, the results offer insights and an avenue to achieve high flux superhydrophobic condensation.

Jumping-Droplet-Enhanced Condensation on Scalable Superhydrophobic Nanostructured Surfaces

A Review of two-phase flow dynamic instabilities in tube boiling systems

https://www.win.tue.nl/~atijssel/pdf_files/Bergant-Simpson-Tijsseling_2006.pdf

Water hammer with column separation: A historical review

Two-phase flow instabilities: A review

The problem of how to accurately measure the flowrate of oil–gas–water mixtures in a pipeline remains one of the key challenges in the petroleum industry. This paper discusses why three-phase flow measurement is still important and why it remains a difficult problem to solve. The measurement strategies and principal base technologies currently used by commercial manufacturers are described, and research developments that could influence future flowmeter design are considered. Finally, future issues, which will need to be addressed by manufacturers and users of three-phase flowmeters, are discussed.

https://iopscience.iop.org/article/10.1088/0957-0233/24/1/012003/pdf

Three-phase flow measurement in the petroleum industry

https://www.tandfonline.com/doi/pdf/10.1080/18811248.1992.9731576

Masanori Aritomi

Papers

Fundamental study on thermo-hydraulics during start-up in natural circulation boiling water reactors. I: Thermo-hydraulic instabilities

Investigation on condensation in presence of a noncondensable gas for a wide range of Reynolds number

Application of ultrasonic doppler method for bubbly flow measurement using two ultrasonic frequencies

Geysering in parallel boiling channels

Approach towards spatial phase reconstruction in transient bubbly flow using a wire-mesh sensor