Article
Chemistry, Multidisciplinary
Jianxing Sun, Xinyu Jiang, Patricia B. Weisensee
Summary: Lubricant-infused surfaces enhance dropwise condensation and heat transfer rates by creating distinct oil-rich and oil-poor regions for water microdroplets to self-propel, but the dynamic interplay between oil film redistribution, droplet self-propulsion, and nucleation process is not fully understood.
Article
Thermodynamics
Marco Tancon, Antonio Abbatecola, Matteo Mirafiori, Stefano Bortolin, Elena Colusso, Alessandro Martucci, Davide Del Col
Summary: This paper experimentally studies the dropwise condensation (DWC) of flowing steam on sol-gel silica-based coated aluminium substrates at various inclinations. The heat transfer coefficient (HTC) and droplet population measurements are conducted under different heat flux and vapor velocity conditions. It is observed that as the surface inclination decreases from vertical to horizontal, the average droplet size increases and there is a significant reduction in HTC, particularly at low vapor velocities. The HTC increases with steam velocity due to the vapor drag force, and at the highest mass velocity, the HTC becomes independent of surface inclination. A model for the droplet departing radius is modified to account for the effect of surface inclination, and it provides satisfactory predictions of HTC for different vapor velocities, heat flux, and surface inclinations. It is proposed to couple this new equation with existing models for heat transfer through a single droplet and drop-size distribution to predict the heat flux during DWC.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2024)
Article
Thermodynamics
Marco Tancon, Riccardo Parin, Stefano Bortolin, Alessandro Martucci, Davide Del Col
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)
Article
Thermodynamics
Fengyong Lv, Sifan Lin, Jie Miao, Cong Wang, Zhenbiao Dong, Raza Gulfam
Summary: This study developed slippery lubricant-infused porous surfaces (SLIPSs) on helically-finned grooves of copper tubes (HF-SLIPSs). The high viscosity lubricant (GPL 107) was locked by the nano-pores of the oxidized layer on the grooves. The results show that HF-SLIPSs not only improve droplet mobility and increase condensing area but also provide directional transport tracks, resulting in a short renewal time and enhanced condensation heat transfer.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Milad Shakeri Bonab, Roger Kempers, Alidad Amirfazli
Summary: This study investigated the influence of airflow on the condensation heat transfer coefficient of humid air on a horizontal surface. The results showed that the heat transfer coefficient was lowest for a subcooling temperature of 0 degrees C, and higher relative humidity resulted in higher heat transfer coefficients.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Zhifeng Hu, Zhiping Yuan, Huimin Hou, Fuqiang Chu, X. M. Wu
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)
Article
Chemistry, Physical
Anthony Katselas, Isaac J. Gresham, Andrew R. J. Nelson, Chiara Neto
Summary: The capture of moisture from the atmosphere through condensation has the potential to provide a sustainable source of water. This study investigates how water contact angle and contact angle hysteresis affect the rates of water capture during condensation of humid air at low subcooling conditions. The results show that hydrophilic and slippery hydrophilic surfaces are preferable for efficient dew collection applications.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Thermodynamics
Chen Ma, Zhiping Yuan, Wei Tong, Lin Wang, Cunjing Lv, Quanshui Zheng
Summary: The coalescence-induced jumping detachment of droplets on superhydrophobic surfaces is a promising strategy in phase-change related applications. This study presents a unified model for accurately predicting droplet jumping and investigates the coupling physics involved in this process. The model is validated and applied to improve the design of droplet-jumping-based vapor chambers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Physical
Je-Un Jeong, Dae-Yun Ji, Kwon-Yeong Lee, Woonbong Hwang, Chang-Hun Lee, Sung-Jae Kim, Jeong-Won Lee
Summary: The study highlights the importance of superhydrophobic surfaces being able to resist attached condensation in supersaturated conditions to improve heat transfer efficiency, which can be achieved by controlling the gap size and complexity of micro/nanoscale surface structures to maintain water repellency.
Article
Thermodynamics
Fengyong Lv, Sifan Lin, Hanlu Nie, Zhenbiao Dong, Fang Zhao, Daolai Cheng, Zhiguang Dong, Raza Gulfam
Summary: This study investigates the droplet dynamics and heat transfer performance of a helically-finned hydrophobic tube fabricated using a simple annealing method. The findings show that the heat transfer coefficient of the helically-finned hydrophobic tube can increase by up to 327% compared to a smooth hydrophilic tube at a specific heat flux. Furthermore, the heat transfer coefficient decreases as the subcooling temperature increases, primarily due to slower droplet growth and dripping frequency. The grooves on the helically-finned hydrophobic tube enhance droplet coalescence and sweeping, resulting in improved heat transfer performance. This study provides technological insights to enhance heat transfer performance in industrial condensers.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Xiangwei Yin, Zhixuan Hu, Shengqiang Shen, Gangtao Liang
Summary: Condensation enhancement on micropillar structured surfaces is studied using a three-dimensional lattice Boltzmann model, and the optimal micropillar configuration is assessed. The study explores the impacts of varying micropillar geometric parameters on heat transfer and droplet dynamics during the transition from dropwise to filmwise condensation. The research highlights the potential for improving condensation efficiency through optimizing the design of micropillar structures.
APPLIED THERMAL ENGINEERING
(2024)
Article
Physics, Fluids & Plasmas
Aritra Mukherjee, Dipankar N. Basu, Pranab K. Mondal, Lin Chen
Summary: This study investigates the dynamics of condensation process on nanostructured surfaces using a mesoscopic lattice Boltzmann method (LBM) framework. The results show that the surface architecture plays a significant role in determining the visual state of the condensate droplet, mode of nucleation, and associated rates of energy and mass interactions. The spacing between surface columns is found to be the most influential parameter.
Article
Thermodynamics
Shao-Fei Zheng, Zi-Yi Wu, Guo-Qing Liu, Yan-Ru Yang, Bengt Sunden, Xiao-Dong Wang
Summary: This work focuses on the multiscale heat transfer characteristics of individual droplets and the quantitative heat transfer evaluation of droplet growth on different condensing surfaces in dropwise condensation. The dynamic roles of thermal resistances are elucidated and the resulting heat transfer characteristics of droplets are understood. The importance of two critical sizes of droplets in characterizing condensation behaviors is highlighted, and three regions are defined to characterize the dependence of droplet size on dominant thermal driving loss. The presence of non-condensable gas significantly changes the dynamic roles of thermal resistances and heat transfer characteristics throughout the droplet size range.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Physics, Fluids & Plasmas
Chia -Ming Chang, Yi-Hsin Lin, Victor Reshetnyak
Summary: The way water condenses on surfaces is crucial for the energy efficiency of heat transfer systems. Controlled manipulation of water condensation on tunable surfaces has potential applications in various fields and offers promising prospects for development.
Article
Construction & Building Technology
Yunran Min, Yi Chen, Hongxing Yang
Summary: This study experimentally investigated the dynamic behavior of primary air condensation in an indirect evaporative cooler (IEC) and its effects on convective heat transfer. The results showed that the dynamic dehumidification performance can significantly influence the wet-bulb effectiveness and convective heat transfer flux of the IEC.
INDOOR AND BUILT ENVIRONMENT
(2022)
Article
Nanoscience & Nanotechnology
Nicholas G. Kowalski, Weiwei Shi, Brook S. Kennedy, Jonathan B. Boreyko
Summary: By systematically varying key parameters, it was found that fog harps design using stainless steel material and specific wire pitch can achieve higher fog water collection efficiency. The study also pointed out that wire length and pitch must be matched to avoid tangling. The elastocapillary wire tangling model was successful in predicting the occurrence of tangling.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Applied
Ndidi L. Eyegheleme, Weiwei Shi, Lance H. De Koninck, Julia L. O'Brien, Jonathan B. Boreyko
Summary: Solar steam generation from a synthetic tree, which utilizes transpiration instead of capillary rise, has shown to be a more efficient method for harvesting fresh water compared to traditional approaches. This innovative approach involves using a nanoporous ceramic disk coated with graphite as a synthetic leaf attached to a vertical array of plastic tubes, resulting in approximately three times more condensed water harvested than an equivalent bulk reservoir.
APPLIED PHYSICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Hyunggon Park, S. Farzad Ahmadi, Jonathan B. Boreyko
Summary: A novel method has been developed to suspend ice in the air without the need for fragile hydrophobic coatings or nanostructures. By preferentially growing frost on specific surface structures and utilizing the dynamic pressure of impacting droplets, ice can be trapped in the air.
PHYSICAL REVIEW LETTERS
(2021)
Article
Multidisciplinary Sciences
Ranit Mukherjee, Hope A. Gruszewski, Landon T. Bilyeu, I. I. I. David G. Schmale, Jonathan B. Boreyko
Summary: Research has shown that plant pathogens can spread through the synergistic action of dew droplets and low wind flow, even without rain splash or strong gusts of wind. Therefore, further understanding the mechanisms of plant pathogen spread among plants is necessary.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Thermodynamics
Ndidi L. Eyegheleme, Kurt Peng, Jonathan B. Boreyko
Summary: Synthetic trees mimic the transpiration cycle of natural trees by utilizing wetted nanopores with negative Laplace pressure during evaporation. The transpiration rate is influenced by ambient humidity, hydraulic load, tree geometry, and dynamic evolution of menisci. Understanding these factors can inform the design of next-generation synthetic trees for water extraction and solar steam generation applications.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Chemistry, Physical
Gracie A. Cornish, Ndidi L. Eyegheleme, Laurel S. Hudson, Kathleen J. Troy, Maia M. Vollen, Jonathan B. Boreyko
Summary: This paper presents a theoretical design and analysis of a portable desalinating water bottle powered by transpiration. The bottle uses an annular fin to absorb solar heat and boost the evaporation rate of water. By utilizing the negative Laplace pressure generated from water evaporation, fresh water can be collected from ocean water using a reverse osmosis membrane.
Article
Physics, Fluids & Plasmas
Mojtaba Edalatpour, Daniel T. Cusumano, Saurabh Nath, Jonathan B. Boreyko
Summary: On a sufficiently hot surface, an ice disk exhibits a three-phase Leidenfrost effect, generating both liquid and vapor films. The critical Leidenfrost temperature for ice is about 400 degrees C higher than that for a water drop, resulting in better heat transfer during quenching of aluminum.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Physics, Multidisciplinary
Venkata Yashasvi Lolla, S. Farzad Ahmadi, Hyunggon Park, Andrew P. Fugaro, Jonathan B. Boreyko
Summary: This study investigates the freezing process of droplets impacting flat ice at room temperature. By using an icy substrate, the nucleation energy barrier is eliminated, leading to an immediate initiation of freeze front when the droplet's temperature cools down to 0°C. Scaling analysis is employed to rationalize different regimes of arrested hydrodynamics, resulting in different scaling laws.
PHYSICAL REVIEW LETTERS
(2022)
Article
Mechanics
Kevin R. Murphy, Jonathan B. Boreyko
Summary: When a sessile droplet contacts an opposing solid surface, the droplet can transfer based on wettabilities and surface velocity. This study used high-speed imaging to capture the transfer process from a solid substrate to a porous surface, varying parameters such as wettability, pore size, droplet volume, and working fluid. The transfer process is divided into wetting and wicking regimes, with wicking being significantly longer than wetting. The wetting regime has two sub-regimes, donor-independent and donor-dependent, while the wicking regime follows Darcy's law to complete the transfer.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Chemistry, Physical
Nicholas G. Kowalski, Jonathan B. Boreyko
Summary: By developing an analytical model, this study investigates the physics of fog droplets draining down a single vertical wire. The study reveals that gravity and surface energy are the driving forces, while inertia, contact angle hysteresis, and local viscous dissipation are the dominant resisting forces. The presence of a Teflon-coated wire reduces the average sliding velocity of fog droplets due to non-coalescence events exclusive to the hydrophobic wire.
Article
Multidisciplinary Sciences
Grady J. Iliff, Ranit Mukherjee, Hope A. Gruszewski, David G. Schmale, Sunghwan Jung, Jonathan B. Boreyko
Summary: This study reveals the unique transport of spores of the fungal pathogen Epicoccum tritici on wheat awns and discusses the role of dew droplets and spore agglomeration. Future plant breeding should consider developing modified spike structures to reduce the spread of fungal plant pathogens.
JOURNAL OF THE ROYAL SOCIETY INTERFACE
(2022)
Article
Chemistry, Physical
Hongwei Zhang, John De Poorter, Ranit Mukherjee, Jonathan B. Boreyko, Rui Qiao
Summary: The study investigates the thermoelectric effects of ice, revealing that when ice slabs are exposed to a temperature gradient, the thermoelectric effects go through a fast initial stage and a slow subsequent stage. The research suggests that at steady state, the thermovoltage and charge accumulation of ice slabs are strongly dependent on their thickness.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
