Ergodic simulation of droplet growth during dropwise condensation

Article Chemistry, Multidisciplinary

Quantification of Nucleation Site Density as a Function of Surface Wettability on Smooth Surfaces

Anthony Katselas et al.

Summary: This study quantifies the effect of surface wettability on droplet nucleation site density, provides a method to predict the nucleation site density, and investigates the growth and coalescence behavior of droplets.

ADVANCED MATERIALS INTERFACES (2022)

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Article Thermodynamics

Dropwise condensation mechanisms when varying vapor velocity

Marco Tancon et al.

Summary: The promotion of dropwise condensation (DWC) provides an effective strategy to improve heat transfer coefficient (HTC) compared to filmwise condensation (FWC). This study experimentally investigates the effect of steam velocity on DWC and finds that it can affect droplet population and size distribution, resulting in changes in condensation HTC. A model is proposed to estimate the droplet departing radius in the presence of vapor velocity and is coupled with available models for droplet population and heat transfer to simulate the entire DWC process. The proposed calculation method is capable of predicting the effect of vapor velocity on DWC heat transfer coefficient.

APPLIED THERMAL ENGINEERING (2022)

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Article Thermodynamics

Exploring the limits of condensation heat transfer: A numerical study of microscale-confined condensation between parallel surfaces having wetting contrast

Chongyan Zhao et al.

Summary: Dropwise condensation has attracted extensive interest due to its potential in enhancing power generation, water harvesting, and thermal management systems. Microscale-confined condensation (MCC) presents a promising method to overcome the limitations of dropwise condensation by decoupling droplet nucleation and growth from condensate removal. MCC achieves this by enabling spontaneous condensate transfer and limiting the maximum droplet size. Through numerical simulations, it is found that smaller surface gaps and smaller condensing surface contact angles are favorable for achieving higher heat transfer rates in pure vapor condensation conditions.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2022)

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Article Thermodynamics

Event-driven Simulation of Multi-scale Dropwise Condensation

Zhifeng Hu et al.

Summary: An event-driven simulation method is proposed to efficiently simulate multi-scale three-dimensional dropwise condensation, significantly improving computational efficiency. The influence of droplet departure modes on dropwise condensation is discussed, showing the importance of droplet jumping in enhancing condensation heat transfer.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2021)

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Article Thermodynamics

Effect of steam velocity during dropwise condensation

Marco Tancon et al.

Summary: Dropwise condensation is a complex phenomenon involving droplet nucleation, coalescence and motion. Limited studies have investigated the effect of vapor velocity on heat transfer coefficient and droplet departing radius during DWC.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER (2021)

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Article Multidisciplinary Sciences

Unique and universal dew-repellency of nanocones

Pierre Lecointre et al.

Summary: The study found that nanocone structures exhibit unique antifogging behavior and have stronger resistance to dew compared to pillar structures of the same size. Through comparisons of different families of nanostructures, it was observed that microdroplets condensing on sharp cones adopt a highly non-adhesive state, while pillar structures result in impedance of droplet ejection.

NATURE COMMUNICATIONS (2021)

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Article Multidisciplinary Sciences

Few-layer graphene on nickel enabled sustainable dropwise condensation

Wei Chang et al.

Summary: A new nanostructured graphene coating has been developed to achieve dropwise condensation even under normal wetting conditions, significantly improving the reliability and long-term effect of condensation.

SCIENCE BULLETIN (2021)

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Article Multidisciplinary Sciences