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Articles de revues sur le sujet « Condensation frosting »

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Auteur : Grafiati
Publié le 11 mars 2023

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1

Yang, Siyan, Chenyang Wu, Guanlei Zhao, Jing Sun, Xi Yao, Xuehu Ma et Zuankai Wang. « Condensation frosting and passive anti-frosting ». Cell Reports Physical Science 2, no 7 (juillet 2021) : 100474. http://dx.doi.org/10.1016/j.xcrp.2021.100474.

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2

Simonson, C. J., et R. W. Besant. « Heat and Moisture Transfer in Energy Wheels During Sorption, Condensation, and Frosting Conditions ». Journal of Heat Transfer 120, no 3 (1 août 1998) : 699–708. http://dx.doi.org/10.1115/1.2824339.

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A numerical model for coupled heat and moisture transfer with sorption, condensation, and frosting in rotary energy exchangers is presented and validated with experimental data. The model is used to study condensation and frosting in energy wheels. Condensation/frosting increases with humidity and at some humidity level, water/frost will continually accumulate in the wheel. The sensitivity of condensation and frosting to wheel speed and desiccant type are studied. The energy wheel performance is also presented during both sorption and saturation conditions for a desicant coating with a Type I sorption isotherm (e.g., molecular sieve) and a linear sorption isotherm (e.g., silica gel). Simulation results show that the desiccant with a linear sorption curve is favorable for energy recovery because it has better performance characteristics and smaller amounts of condensation/frosting for extreme operating conditions.
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3

Zhang, Long, Mengjie Song, Christopher Yu Hang Chao, Chaobin Dang et Jun Shen. « Localized Characteristics of the First Three Typical Condensation Frosting Stages in the Edge Region of a Horizontal Cold Plate ». Micromachines 13, no 11 (4 novembre 2022) : 1906. http://dx.doi.org/10.3390/mi13111906.

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Condensation frosting usually causes a negative influence on heat exchangers employed in engineering fields. As the relationships among the first three typical condensation frosting stages in the edge regions of cold plates are still unclear, an experimental study on the localized condensation frosting characteristics in the edge region of a cold plate was conducted. The edge effects on the water droplet condensation (WDC), water droplet frozen (WDF) and frost layer growth characteristics were quantitatively investigated. The results showed that the number of droplets coalescing in the edge-affected regions was around 50% greater than in the unaffected regions. At the end of the WDC stages, the area-average equivalent contact diameter and coverage area ratio of water droplets in the edge-affected regions were 2.69 times and 11.6% greater than those in the unaffected regions under natural convection, and the corresponding values were 2.24 times and 9.9% under forced convection. Compared with the unaffected regions, the WDF stage duration in the edge-affected regions decreased by 63.6% and 95.3% under natural and forced convection, respectively. Additionally, plate-type and feather-type frost crystals were, respectively, observed in natural and forced convection. The results of this study can help in the better understanding of the condensation frosting mechanism on a cold plate, which provides guidelines for optimizing the design of heat exchanger structures and system control strategies facing frosting problems.
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4

Nath, Saurabh, S. Farzad Ahmadi et Jonathan B. Boreyko. « A Review of Condensation Frosting ». Nanoscale and Microscale Thermophysical Engineering 21, no 2 (2 novembre 2016) : 81–101. http://dx.doi.org/10.1080/15567265.2016.1256007.

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5

Chen, Xintao, Xian Wu, Fang Li, Xiaofeng Zhao et Shanlin Wang. « Enhancement of Condensation Heat Transfer, Anti-Frosting and Water Harvesting by Hybrid Wettability Coating ». Nano 16, no 08 (juillet 2021) : 2150086. http://dx.doi.org/10.1142/s1793292021500867.

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Hydrophilic–hydrophobic hybrid wettability structures, inspired by desert beetles, have been widely designed to enhance the dewdrops’ migration under subcooled or/and high-humidity environment. However, it is still a challenge to regulate the graded distribution of the hydrophilic micro-regions for condensation applications. In this paper, we design a simple spray method to prepare the superamphiphilic–superamphiphobic hybrid wettability coatings by controlling the mass ratio (MR) of superamphiphobic SiO2 nano-powder and superamphiphilic gypsum micro-powder. We compare the macroscopical wettability, condensation heat transfer efficiency, frosting delayed time and water harvesting rate to demonstrate the unique advantage of hybrid wettability structures. The results show that the condensation heat transfer efficiency, frosting delayed time and water harvesting rate can be respectively promoted to about 131.50% [Formula: see text], 134.74% [Formula: see text] and 135.62% [Formula: see text], although their macroscopical wettability will gradually reduce with the MR increase. This work will provide substantial insights into the fabrication of efficient superhydrophilic–superhydrophobic hybrid wettability surfaces for condensation heat transfer, anti-frosting and water harvesting applications.
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6

Yang, Kai-Shing, Wei Lu et Yu-Lieh Wu. « Visualization of Patterned Modified Surfaces in Condensation and Frosting States ». Energies 12, no 23 (23 novembre 2019) : 4471. http://dx.doi.org/10.3390/en12234471.

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In this study, a novel, thorn-shaped, containing, hydrophilic, and hydrophobic surface is proposed to have a better condensate drainage characteristic and to delay the required time for frosting. By using a hydrophilic and hydrophobic mixed thorn-shaped surface created by screen printing, the design makes use of the differences in the wettability gradient to achieve rapid condensate drainage and to lengthen the time for frosting. The results of a frosting experiment indicated that the droplet adsorption and combination and discharge effect in the thorn sample were substantial. The drainage effect increased the surface renewal rate and inhibited ice layer growth on the thorn sample by 52.4% compared with that on pure copper surface. The heat transfer coefficient of the thorn sample during frosting was approximately 16.2% higher than that of pure copper surface. In addition, the defrosting results indicated that the defrosting time of the thorn sample was almost equal to that of the pure copper sample. However, large droplets were easily stagnated at the structural junction due to contact angle hysteresis after defrosting.
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7

Huang, Chengzhi, Yugang Zhao et Tian Gu. « Ice Dendrite Growth Atop a Frozen Drop under Natural Convection Conditions ». Crystals 12, no 3 (25 février 2022) : 323. http://dx.doi.org/10.3390/cryst12030323.

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Condensation frosting is a type of icing encountered ubiquitously in our daily lives. Understanding the dynamics of condensation frosting is essential in developing effective technologies to suppress frost accretions that compromise heat transfer and system integrity. Here, we present an experimental study on ice dendrite growth atop a single frozen drop, an important step affecting the subsequent frosting process, and the properties of fully-developed frost layers. We evaluate the effect of natural convection by comparing the growth dynamics of ice dendrites on the surface of a frozen drop with three different orientations with respect to gravity. The results show that both the average deposition rate and its spatial variations are profoundly altered by surface orientations. Such behavior is confirmed by a numerical simulation, showing how gravity-assisted (hindered) vapor diffusion yields the deposition outcomes. These findings benefit the optimization of anti-/de- frosting technologies and the rational design of heat exchangers.
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8

QUAN, YUN-YUN, PEI-GUO JIANG et LI-ZHI ZHANG. « DEVELOPMENT OF FRACTAL ULTRA-HYDROPHOBIC COATING FILMS TO PREVENT WATER VAPOR DEWING AND TO DELAY FROSTING ». Fractals 22, no 03 (septembre 2014) : 1440002. http://dx.doi.org/10.1142/s0218348x14400027.

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Superhydrophobic films fabricated on copper and aluminum surfaces have potential applications to solve water condensation and frosting problems on chilled ceiling system. The rough surfaces of copper foils obtained by solution immersion method exhibit the existence of fractal structures. The hydrophobicity of copper surfaces is enhanced with fractal structures. The relationship between contact angles (CAs) and the fractal dimensions (FDs) for surface roughness of Cu samples with different etching time is investigated. Moisture condensation and frosting experiments on the two kinds of surfaces are conducted in natural environment under different chilling temperatures. During condensation, micro water condensate droplets drift down the surface like dust floating in the air. Several larger condensate droplets about 1–2 mm appear on the substrates after 3 h condensation. This continuous jumping motion of the condensate will be beneficial in delaying frosting. The results demonstrate that dense nanostructures on copper surfaces are superior to loose lattice-like microstructures on aluminum surfaces for preventing the formation of large droplets condensate and in delaying the icing. The large water droplets of 2–3 mm in diameter that would form on a common metal foil are sharply decreased to dozens of microns and small droplets are formed on a modified surface, which will then drift down like a fog.
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9

Nath, Saurabh, S. Farzad Ahmadi et Jonathan B. Boreyko. « How ice bridges the gap ». Soft Matter 16, no 5 (2020) : 1156–61. http://dx.doi.org/10.1039/c9sm01968e.

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10

Zuo, Zichao, Yugang Zhao, Kang Li, Hua Zhang et Chun Yang. « Suppressing condensation frosting using micropatterned ice walls ». Applied Thermal Engineering 224 (avril 2023) : 120099. http://dx.doi.org/10.1016/j.applthermaleng.2023.120099.

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11

Jeong, Chan Ho, et Seong Hyuk Lee. « Condensation Frosting Characteristics of SAM-Coated Nanostructured Superhydrophobic Surface ». International Journal of Air-Conditioning and Refrigeration 26, no 01 (mars 2018) : 1850008. http://dx.doi.org/10.1142/s2010132518500086.

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The present study aims to experimentally investigate the condensation frosting characteristics of the SAM-coated superhydrophobic surfaces under various environmental conditions. The extensive experiments were carried out under the well-controlled conditions with the surface temperature ranging from [Formula: see text]C to [Formula: see text]C, the relative humidity of 60%, and the air temperature of 24[Formula: see text]C. The dynamics of condensation frosting was analyzed from the captured images by using CMOS camera. From the results, it was found that even if the substrate remained at a subfreezing temperature, the spontaneous freezing of supercooled condensates did not occur because of the free energy barrier of ice embryo at the interface of the substrate-supercooled droplet. The onset of condensate freezing was also triggered by probabilistic ice nucleation. In particular, the delay of the onset time of freezing was found for the nanostructured superhydrophobic surface and substantially dependent on the coolant temperature. Moreover, it observed the presence of an inter-droplet ice bridging between a frozen droplet and neighboring supercooled droplets.
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12

He, Song, Yanmei Zhang, Wansheng Yang, Xudong Zhao et Bin Zeng. « Fabrication and Frosting Properties Study of Surface-Active Agents Coating Based on Nanoporous Aluminum Substrate ». Energies 11, no 10 (17 octobre 2018) : 2797. http://dx.doi.org/10.3390/en11102797.

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In order to solve the frosting and blockage problem of an air conditioning evaporator’s fin in winter, the nanoporous aluminum plates with low surface energy has been proposed in this paper, which are fabricated by an anodizing method and then modified by lauric acid. The nanoporous aluminum plates with different nanoporous diameters ranging from 15 nm to 400 nm are obtained by changing the magnitude of the oxidation current. The surface contact angle of the nanoporous aluminum plates is an important factor influencing its surface frost and condensation. The test results show that the surface contact angle is decreased with the increasing of nanoporous diameter. When the nanoporous aluminum plates are modified by lauric acid, the contact angle is proportional to the nanoporous diameter, and the maximum contact angle can reach about 171°. A set of experimental instruments has been set up to simulate the typical winter climate in northern China, and the frosting properties of the nanoporous aluminum plate’s fin is analyzed by experiment. The results show that increasing the contact angle of aluminum plates can effectively improve its anti-frosting properties. The average frosting rate of the aluminum plate with the contact angle of 60° is about 0.33 [g/(min∙m2)], which is 1.74 times that of the aluminum plate with the contact angle of 171°, whose frosting rate is about 0.19 [g/(min∙m2)]. After taking the expanded aperture processing to the aluminum plate, the diameter with 30 nm, 100 nm, 200 nm, 300 nm, and 400 nm nanoporous aluminum plates are obtained and the polished aluminum plates are also prepared for comparing. Through the test results, the nanoporous aluminum plates are shown to have anti-frosting properties, and the nanoporous aluminum plates with diameter of 300 nm are shown to have the best anti-frosting properties. The calculation mode of frosting growth is derived on the base of experimental results. This research will be helpful in indicating the potential research area of the low-carbon-emission and energy-saving technology for the researchers all over the world.
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13

Boyina, Kalyan S., Allison J. Mahvi, Shreyas Chavan, Deokgeun Park, Kishan Kumar, Maury Lira, Yangxue Yu, Alperen Ahmet Gunay, Xiaofei Wang et Nenad Miljkovic. « Condensation frosting on meter-scale superhydrophobic and superhydrophilic heat exchangers ». International Journal of Heat and Mass Transfer 145 (décembre 2019) : 118694. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2019.118694.

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14

Shen, Yuchen, et Sophie Wang. « Condensation frosting detection and characterization using a capacitance sensing approach ». International Journal of Heat and Mass Transfer 147 (février 2020) : 118968. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2019.118968.

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15

Ahmadi, S. Farzad, Corey A. Spohn, Saurabh Nath et Jonathan B. Boreyko. « Suppressing Condensation Frosting Using an Out-of-Plane Dry Zone ». Langmuir 36, no 51 (16 décembre 2020) : 15603–9. http://dx.doi.org/10.1021/acs.langmuir.0c03054.

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16

Sun, Xiaoda, Viraj G. Damle, Aastha Uppal, Rubin Linder, Sriram Chandrashekar, Ajay R. Mohan et Konrad Rykaczewski. « Inhibition of Condensation Frosting by Arrays of Hygroscopic Antifreeze Drops ». Langmuir 31, no 51 (16 décembre 2015) : 13743–52. http://dx.doi.org/10.1021/acs.langmuir.5b03869.

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17

Baheri, F. Tarpoudi, L. D. Poulikakos, D. Poulikakos et T. M. Schutzius. « Dropwise condensation freezing and frosting on bituminous surfaces at subzero temperatures ». Construction and Building Materials 298 (septembre 2021) : 123851. http://dx.doi.org/10.1016/j.conbuildmat.2021.123851.

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18

Yao, Yuehan, Tom Y. Zhao, Christian Machado, Emma Feldman, Neelesh A. Patankar et Kyoo-Chul Park. « Frost-free zone on macrotextured surfaces ». Proceedings of the National Academy of Sciences 117, no 12 (10 mars 2020) : 6323–29. http://dx.doi.org/10.1073/pnas.1915959117.

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Numerous studies have focused on designing functional surfaces that delay frost formation or reduce ice adhesion. However, solutions to the scientific challenges of developing antiicing surfaces remain elusive because of degradation such as mechanical wearing. Inspired by the discontinuous frost pattern on natural leaves, here we report findings on the condensation frosting process on surfaces with serrated structures on the millimeter scale, which is distinct from that on a conventional planar surface with microscale/nanoscale textures. Dropwise condensation, during the first stage of frosting, is enhanced on the peaks and suppressed in the valleys, causing frost to initiate from the peaks, regardless of surface chemistry. The condensed droplets in the valley are then evaporated due to the lower vapor pressure of ice compared with water, resulting in a frost-free zone in the valley, which resists frost propagation even on superhydrophilic surfaces. The dependence of the frost-free areal fraction on the geometric parameters and the ambient conditions is elucidated by both numerical simulations based on steady-state diffusion and an analytical method with an understanding of boundary conditions independent of surface chemistry. We envision that this study would provide a unified framework to design surfaces that can spatially control frost formation, crystal growth, diffusion-controlled growth of biominerals, and material deposition over a broad range of applications.
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19

Shen, Yuchen, Haoyang Zou et Sophie Wang. « Condensation Frosting on Micropillar Surfaces – Effect of Microscale Roughness on Ice Propagation ». Langmuir 36, no 45 (4 novembre 2020) : 13563–74. http://dx.doi.org/10.1021/acs.langmuir.0c02353.

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20

Holmberg, R. B. « Sensible and Latent Heat Transfer in Cross-Counterflow Gas-To-Gas Heat Exchangers ». Journal of Heat Transfer 111, no 1 (1 février 1989) : 173–77. http://dx.doi.org/10.1115/1.3250640.

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Simultaneous heat and mass transfer during condensation in cross-counterflow gas-to-gas heat exchangers has been analyzed. The coupled heat and mass transfer equations are derived for boundary-layer controlled heat and mass transfer and include longitudinal heat conduction in the exchanger wall. A numerical method of the finite-difference type is applied to the steady-state performance. Temperature and absolute humidity distributions are calculated for exchanger parameters that are typical in air conditioning systems. Temperature and humidity efficiencies together with frosting limits are evaluated for different inlet air conditions.
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21

MORONUKI, Nobuyuki, et Shutaro NAKAMURA. « Attempt of Anti-Frosting Surface by Discrete Condensation of Water with Hydrophilic/Hydrophobic Pattern ». Journal of the Japan Society for Precision Engineering 87, no 11 (5 novembre 2021) : 889–93. http://dx.doi.org/10.2493/jjspe.87.889.

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22

Jiang, J., Q. Sheng, G. H. Tang, M. Y. Yang et L. Guo. « Anti-icing propagation and icephobicity of slippery liquid-infused porous surface for condensation frosting ». International Journal of Heat and Mass Transfer 190 (juillet 2022) : 122730. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2022.122730.

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23

Wang, Yuan, et Yong Cheng. « Early stage condensation frosting characteristics on plain and nano Al2O3-epoxy mixture-coated brass ». Applied Thermal Engineering 160 (septembre 2019) : 113971. http://dx.doi.org/10.1016/j.applthermaleng.2019.113971.

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24

Gu, Wancheng, Kaixing Song, Zhen Cheng, Qiaoling Wang, Shanlin Wang, Xikui Wang, Xinquan Yu et Youfa Zhang. « Water‐Based Robust Transparent Superamphiphobic Coatings for Resistance to Condensation, Frosting, Icing, and Fouling ». Advanced Materials Interfaces 7, no 10 (16 mars 2020) : 1902201. http://dx.doi.org/10.1002/admi.201902201.

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25

Gu, Yaxiu, Guixiang He, Shuaipeng Li, Weiqi Ding, Hanlin Li et Jiahui Duan. « Study on Frost-Suppression Characteristics of Superhydrophobic Aluminum Surface Heat Exchanger Applied in Air Source Heat Pump ». Sustainability 14, no 4 (9 février 2022) : 1954. http://dx.doi.org/10.3390/su14041954.

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In order to solve the frosting problem of air source heat pump (ASHP) outdoor heat exchange under low-temperature and low-humidity conditions, a superhydrophobic aluminum (Al) surface with a contact angle (CA) of 158.3° was prepared by chemical etching. The microscopic characteristics of droplet condensation and the freezing process of a superhydrophobic surface were revealed through visual experiments and theoretical analysis. On this basis, the frost-suppression effect of a superhydrophobic Al-based surface simulating the distribution of actual heat exchanger fins was preliminarily explored. The results demonstrated that, due to the large nucleation energy barrier and the coalescence-bounce behavior of droplets, the condensed droplets on the superhydrophobic surface appeared late and their quantity was low. The thermal conductivity of the droplets on a superhydrophobic surface was large, so their freezing rate was low. The frosting amount on the superhydrophobic Al-based surface was 69.79% of that of the bare Al-based surface. In turn, the time required for melting the frost layer on the superhydrophobic Al-based surface was 64% of that on the bare Al-based surface. The results of this study lay an experimental and theoretical foundation for the application of superhydrophobic technology on the scale of heat exchangers.
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Zhao, Yugang, Ruzhu Wang et Chun Yang. « Interdroplet freezing wave propagation of condensation frosting on micropillar patterned superhydrophobic surfaces of varying pitches ». International Journal of Heat and Mass Transfer 108 (mai 2017) : 1048–56. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2016.12.112.

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27

Kasahara, Kazuya, Tomonori Waku, Peter W. Wilson, Taishi Tonooka et Yoshimichi Hagiwara. « The Inhibition of Icing and Frosting on Glass Surfaces by the Coating of Polyethylene Glycol and Polypeptide Mimicking Antifreeze Protein ». Biomolecules 10, no 2 (9 février 2020) : 259. http://dx.doi.org/10.3390/biom10020259.

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The development of anti-icing, anti-frosting transparent plates is important for many reasons, such as poor visibility through the ice-covered windshields of vehicles. We have fabricated new glass surfaces coated with polypeptides which mimic a part of winter flounder antifreeze protein. We adopted glutaraldehyde and polyethylene glycol as linkers between these polypeptides and silane coupling agents applied to the glass surfaces. We have measured the contact angle, the temperature of water droplets on the cooling surfaces, and the frost weight. In addition, we have conducted surface roughness observation and surface elemental analysis. It was found that peaks in the height profile, obtained with the atomic force microscope for the polypeptide-coated surface with polyethylene glycol, were much higher than those for the surface without the polypeptide. This shows the adhesion of many polypeptide aggregates to the polyethylene glycol locally. The average supercooling temperature of the droplet for the polypeptide-coated surface with the polyethylene glycol was lower than for the polypeptide-coated surface with glutaraldehyde and the polyethylene-glycol-coated surface without the polypeptide. In addition, the average weight of frost cover on the specimen was lowest for the polypeptide-coated surface with the polyethylene glycol. These results argue for the effects of combined polyethylene glycol and polypeptide aggregates on the locations of ice nuclei and condensation droplets. Thus, this polypeptide-coating with the polyethylene glycol is a potential contender to improve the anti-icing and anti-frosting of glasses.
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28

Yang, Bin, Xin Zhu, Minzhang Liu et Zhihan Lv. « Review on the Application of Machine Vision in Defrosting and Decondensation on the Surface of Heat Exchanger ». Sustainability 14, no 18 (15 septembre 2022) : 11606. http://dx.doi.org/10.3390/su141811606.

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Under low outdoor temperature and high humidity, frost easily forms on the Heat Exchanger (Exchanger) surface on the outdoor side. The formation and growth of this frost layer will seriously impact the Exchanger’s heat extraction process and the system’s energy efficiency, triggering malfunction in the compressor. To this end, this work first analyzes the formation and growth mechanism of Exchanger surface frosting and condensation. It then summarizes the current research status of Machine Vision (MV) technology in defrosting and decondensation. Further, it previews the follow-up research direction. The experimental findings show that MV technology can automatically observe frost and dew, guaranteeing a real-time understanding of the frost layer. Directly obtaining the frost and dew information from the image can significantly save human resources and improve efficiency.
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Chatterjee, Rukmava, Umesh Chaudhari et Sushant Anand. « How to Select Phase Change Materials for Tuning Condensation and Frosting ? (Adv. Funct. Mater. 3/2023) ». Advanced Functional Materials 33, no 3 (janvier 2023) : 2370019. http://dx.doi.org/10.1002/adfm.202370019.

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Zheng, Chenxiao, Shijun You, Huan Zhang, Zeqin Liu, Wandong Zheng, Zhenjing Wu et Man Fan. « Defrosting Performance Improvement of Air-Source Heat Pump Combined Refrigerant Direct-Condensation Radiant Floor Heating System with Phase Change Material ». Energies 13, no 18 (4 septembre 2020) : 4594. http://dx.doi.org/10.3390/en13184594.

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Traditional defrosting methods applied to solve frosting problems of air-source heat pumps operating in cold periods may reduce heat capacity of the system and decrease indoor thermal comfort. In order to improve the performance of air-source heat pump (ASHP) and maintain indoor temperature in defrosting conditions, an air-source heat pump combined with a refrigerant direct-condensation radiant floor heating system with phase change material is proposed and evaluated in this study. Two radiant floor heating terminals with and without composite phase change material modules were compared through experiments. A composite phase change material based on dodecanoic acid-tetradecanol-hexadecanol mixture and expanded graphite was investigated for this application. Experimental results indicate that both heat fluxes of two comparing terminals are higher than 70 W/m2 in heating condition. At the same time, the floor surface temperature, indoor air temperature, and heating capacity of the terminal with composite phase change material modules are higher than those without composite phase change material modules in defrosting condition. This suggests that the proposed system with composite phase change material modules can improve indoor thermal comfort in defrosting condition as well as satisfy the heating requirement in heating condition.
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31

Wang, Yuan, et Yong Cheng. « Corrigendum to “Early stage condensation frosting characteristics on plain and nano Al2O3-epoxy mixture-coated brass” [Appl. Therm. Eng. 160 (2019) 113971] ». Applied Thermal Engineering 199 (novembre 2021) : 117610. http://dx.doi.org/10.1016/j.applthermaleng.2021.117610.

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32

Gu, Wancheng, Kaixing Song, Zhen Cheng, Qiaoling Wang, Shanlin Wang, Xikui Wang, Xinquan Yu et Youfa Zhang. « Water‐Based Coatings : Water‐Based Robust Transparent Superamphiphobic Coatings for Resistance to Condensation, Frosting, Icing, and Fouling (Adv. Mater. Interfaces 10/2020) ». Advanced Materials Interfaces 7, no 10 (mai 2020) : 2070053. http://dx.doi.org/10.1002/admi.202070053.

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Zhang, Hongqiang, Guanlei Zhao, Shuwang Wu, Yousif Alsaid, Wenzheng Zhao, Xiao Yan, Lei Liu et al. « Solar anti-icing surface with enhanced condensate self-removing at extreme environmental conditions ». Proceedings of the National Academy of Sciences 118, no 18 (26 avril 2021) : e2100978118. http://dx.doi.org/10.1073/pnas.2100978118.

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The inhibition of condensation freezing under extreme conditions (i.e., ultra-low temperature and high humidity) remains a daunting challenge in the field of anti-icing. As water vapor easily condensates or desublimates and melted water refreezes instantly, these cause significant performance decrease of most anti-icing surfaces at such extreme conditions. Herein, inspired by wheat leaves, an effective condensate self-removing solar anti-icing/frosting surface (CR-SAS) is fabricated using ultrafast pulsed laser deposition technology, which exhibits synergistic effects of enhanced condensate self-removal and efficient solar anti-icing. The superblack CR-SAS displays superior anti-reflection and photothermal conversion performance, benefiting from the light trapping effect in the micro/nano hierarchical structures and the thermoplasmonic effect of the iron oxide nanoparticles. Meanwhile, the CR-SAS displays superhydrophobicity to condensed water, which can be instantly shed off from the surface before freezing through self-propelled droplet jumping, thus leading to a continuously refreshed dry area available for sunlight absorption and photothermal conversion. Under one-sun illumination, the CR-SAS can be maintained ice free even under an ambient environment of −50 °C ultra-low temperature and extremely high humidity (ice supersaturation degree of ∼260). The excellent environmental versatility, mechanical durability, and material adaptability make CR-SAS a promising anti-icing candidate for broad practical applications even in harsh environments.
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34

Tang, Rui, Feng Wang, Zhihao Wang et Weibo Yang. « Division of Frosting Type and Frosting Degree of the Air Source Heat Pump for Heating in China ». Frontiers in Energy Research 9 (25 août 2021). http://dx.doi.org/10.3389/fenrg.2021.708478.

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The frosting type and frosting degree of the outdoor heat exchanger of air source heat pump (ASHP) in the heating season are greatly affected by the local environmental temperature and humidity. China has a vast territory, and the climate varies greatly in different regions. Therefore, when the ASHP is running in different climate zones for heating in winter, there are significant differences in the frosting type and frosting degree. In order to achieve deeper understanding of frost formation and provide more accurate guidance for the suitability application of antifrosting and defrosting technologies, a study on the division of frosting type and frosting degree was performed in this work. Based on the three-phase diagram of water and combined with the theory of phase change dynamics, the outdoor heat exchanger of the ASHP in the heating season was divided into four states: neither frosting nor condensation, condensation, condensation frosting, and sublimation frosting, and the proportion of each state in a typical city in different climate zones was calculated. The results showed that more than 80% of the heating seasons in Nanjing, Shanghai, Wuhan, Changsha, Xi’an, and Harbin had the frosting phenomenon. Sublimation frosting was the main frosting type in Xi’an, Beijing, and Harbin, while Chongqing was all condensation frosting. Moreover, a frosting model was developed and the frosting degree was divided into mild frosting, moderate frosting, and heavy frosting, according to the performance attenuation of the ASHP under frosting conditions. The proportion of each frosting degree in a typical city was achieved. About 50% of the heating seasons in Nanjing and Changsha were distributed in the heavy frost area and 100% in Chongqing.
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35

Niroomand, S., M. T. Fauchoux et C. J. Simonson. « Effect of Moisture Transfer Through a Semipermeable Membrane on Condensation/Frosting Limit ». Journal of Heat Transfer 140, no 12 (25 septembre 2018). http://dx.doi.org/10.1115/1.4041185.

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This paper investigates frost formation on a flat horizontal surface, with humid air flowing over the surface and a cold liquid desiccant flowing below the surface. Two different surfaces, a semipermeable membrane and an impermeable plate, are tested. The condensation/frosting limit, that is, the lowest air humidity ratio, Wair, at a constant liquid temperature, Tliq, or the highest Tliq at a constant Wair that leads to condensation/frosting, is determined for each surface. The main aim of this study is to find the effect of moisture transfer through the semipermeable membrane on the condensation/frosting limit. It is found that the semipermeable membrane has a lower condensation/frosting limit, due to the moisture transfer through the semipermeable membrane, which dehumidifies the air flow. For a given Wair, the surface temperature can be approximately 5 to 8 °C lower when using a semipermeable membrane, compared to an impermeable plate, before condensation/frosting occurs. Furthermore, it is shown that at some operating conditions, frost appears on the semipermeable membrane only at the air flow entrance of the test section, while the impermeable plate was fully covered with frost at the same operating conditions. Moreover, it is shown that increasing the moisture transfer rate through the semipermeable membrane decreases the frosting limit and delays frost formation.
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36

Zuo, Zichao, Yugang Zhao, Kang Li, Hua Zhang et Chun Yang. « Suppressing Condensation Frosting Using Micropatterned Ice Walls ». SSRN Electronic Journal, 2022. http://dx.doi.org/10.2139/ssrn.4204580.

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Lu, Chenguang, Cong Liu, Zichao Yuan, Haiyang Zhan, Danyang Zhao, Lei Zhao, Shile Feng et Yahua Liu. « Gradient droplet distribution promotes spontaneous formation of frost-free zone ». Communications Materials 3, no 1 (29 octobre 2022). http://dx.doi.org/10.1038/s43246-022-00308-5.

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AbstractThe inhibition of condensation frosting at harsh environments is critical in various anti-icing applications. However, frosting on the entire surface is the final fate for most passive anti-icing strategies as a result of inevitable ice nucleation of subcooled droplets from the surface edges or defects and the following inter-droplet freezing wave propagation. Here, we report the frost-free zone formation on a macro-ridged surface. We design a macroscale ridge on the surface and show that this surface configuration changes the spatial distribution of water vapor diffusion flux during the condensation stage, resulting in a gradient arrangement of condensate droplets according to their size. This allows numerous failures of local inter-droplet ice bridging in the area with a critical droplet coverage rate, which triggers the interruption of the global freezing wave propagation and the evaporation of the rest droplets to form a frost-free zone around the ridge corner. These findings extend our understanding of frost formation on the surface and provide a rationale for the surface design with impressive durable anti-frosting performance.
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38

Ma, Chen, Li Chen, Lin Wang, Wei Tong, Chenlei Chu, Zhiping Yuan, Cunjing Lv et Quanshui Zheng. « Condensation droplet sieve ». Nature Communications 13, no 1 (14 septembre 2022). http://dx.doi.org/10.1038/s41467-022-32873-1.

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AbstractLarge droplets emerging during dropwise condensation impair surface properties such as anti-fogging/frosting ability and heat transfer efficiency. How to spontaneously detach massive randomly distributed droplets with controlled sizes has remained a challenge. Herein, we present a solution called condensation droplet sieve, through fabricating microscale thin-walled lattice structures coated with a superhydrophobic layer. Growing droplets were observed to jump off this surface once becoming slightly larger than the lattices. The maximum radius and residual volume of droplets were strictly confined to 16 μm and 3.2 nl/mm2 respectively. We reveal that this droplet radius cut off is attributed to the large tolerance of coalescence mismatch for jumping and effective isolation of droplets between neighboring lattices. Our work brings forth a strategy for the design and fabrication of high-performance anti-dew materials.
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39

Su, Wei, Longnan Li, Xiao Yan et Nenad Miljkovic. « Frost Halo Dynamics on Superhydrophobic Surfaces ». Journal of Heat Transfer 142, no 3 (5 février 2020). http://dx.doi.org/10.1115/1.4046148.

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Abstract Understanding the frosting mechanisms on solid surfaces is crucial to a broad range of industrial sectors such as aerospace, power transmission, and refrigeration. During the last few decades, extensive studies have been conducted on fundamental frosting phenomena, including ice nucleation, growth, bridging, and frost propagation, with few studies focusing on frost halo formation which has been shown to affect frosting dynamics on hydrophilic substrates. The role of frost halo dynamics formation on superhydrophobic surface remains unclear due to limited characterization in the past. Here, in order to study frost propagation dynamics, particularly freezing-induced vapor diffusion and frost halo formation, condensation frosting on highly-reflective nanostructured superhydrophobic surfaces (θ ≈170º) was visualized using high-speed top-view optical microscopy. Condensation frosting was initiated by cooling the surface to -20 ± 0.5°C in atmospheric conditions (relative humidity ≈50% and air temperature ≈25°C). We show that the wave front reaches neighboring supercooled droplets along the path of frost propagation, resulting in supercooled droplet freezing within ~100 ms and numerous microscale (~1 µm) condensing droplets forming around the primary freezing droplet. The microscale droplets form a condensate halo stretching two times the freezing droplet radius. The condensate halo was formed by the rapid evaporation of the supercooled recalescent freezing droplet due to the fast (~100 ms) release of latent heat, resulting in the heating of the freezing droplet and thus outwards diffusion of vapor. Further diffusion of vapor led to the subsequent evaporation of the halo condensate droplets within ~4 s. Interestingly, accompanied by the freezing of the primary droplet and condensate halo formation, the neighboring satellite droplets in the halo zone were observed to oscillate directionally and dramatically, indicative of the presence of a strong flow field disturbance due to rapid vapor diffusion. The visualizations presented here not only help to quantify the physics of condensate halo formation during frost wave propagation on superhydrophobic surfaces, but also provide insights into the role of freezing-induced vapor diffusion during frost dynamics.
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Yoon, Jongsun, Xiacong Zhang, Min Ryu, Won Hee Kim, Kyuwook Ihm, Jeong Wook Lee, Wen Li et Hyomin Lee. « Tailoring the Hydrophilicity for Delayed Condensation Frosting in Antifogging Coatings ». ACS Applied Materials & ; Interfaces, 21 juillet 2022. http://dx.doi.org/10.1021/acsami.2c07316.

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41

Curiotto, Stefano, David Paulovics, Christophe Raufaste, Franck Celestini, Thomas Frisch, Frédéric Leroy, Fabien Cheynis et Pierre Müller. « Atomistic Description of Interdroplet Ice-Bridge Formation during Condensation Frosting ». Langmuir, 19 décembre 2022. http://dx.doi.org/10.1021/acs.langmuir.2c02860.

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42

Chatterjee, Rukmava, Umesh Chaudhari et Sushant Anand. « How to Select Phase Change Materials for Tuning Condensation and Frosting ? » Advanced Functional Materials, 20 novembre 2022, 2206301. http://dx.doi.org/10.1002/adfm.202206301.

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43

Jeong, Chan Ho, Jae Bin Lee, Seong Hyuk Lee, Jungho Lee, Seung Mun You et Chang Kyoung Choi. « Frosting Characteristics on Hydrophilic and Superhydrophobic Copper Surfaces ». Journal of Heat Transfer 138, no 2 (18 janvier 2016). http://dx.doi.org/10.1115/1.4032257.

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The main objective of this study is to examine the frosting characteristics affected by the surface wettability. Two different copper surfaces – bare and nano structured - were prepared for the experiments. Their static contact angles are 74° (bare: without surface treatment) and 154° (nano-structured), respectively. The temperature of the copper substrate was measured by using resistance temperature detector (RTD) sensors embedded inside small holes drilled at 1 mm underneath the surface. During the phase change, the temperature of the copper substrates remained -7.8±0.6°C and the ambient temperature was set as 24±0.5°C with the relative humidity of 45%. Images were captured by using the CMOS camera with the 5 second time interval. Film condensation occurred because of higher wettability of the bare copper surface. Film condensates were frozen at the early stage and frost crystal grew in the vertical direction. On the other hand, dropwise condensates formed on the nano-structured copper surface remained as the supercooled liquid phase for 44 minutes owing to its low wettability. After 4 minutes, frosting on the bare copper substrate was triggered and propagated until it covered the whole surface. The frosting was significantly delayed on the superhydrophobic copper surface due to the lower surface free energy. The different porous media composed of frost which directly influence the heat transfer characteristics was formed on each surfaces. Therefore, additional investigation for heat transfer phenomenon on superhydrophobic surface should be conducted.
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44

Navid, Pooya, Shirin Niroomand et Carey J. Simonson. « A New Approach to Delay or Prevent Frost Formation in Membranes ». Journal of Heat Transfer 141, no 1 (16 novembre 2018). http://dx.doi.org/10.1115/1.4041557.

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Saturation of the water vapor is essential to form frost inside a permeable membrane. The main goal of this paper is to develop a numerical model that can predict temperature and humidity inside a membrane in order to show the location and time of saturation. This numerical model for heat and mass transfer is developed to show that frost formation may be prevented or delayed by controlling the moisture transfer through the membrane, which is the new approach in this paper. The idea is to simultaneously dry and cool air to avoid saturation conditions and thereby eliminate condensation and frosting in the membrane. Results show that saturation usually occurs on side of the membrane with the highest temperature and humidity. The numerical model is verified with experimental data and used to show that moisture transfer through the membrane can delay or prevent frost formation.
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Long, ZHANG, SONG Mengjie, ZHAN Tianzhuo et SHEN Jun. « Cold Plate Temperature Effect on Droplet and Frost Crystal Behaviors at the Early Condensation Frosting Stage Considering Plate Edge Effect ». Engineered Science, 2022. http://dx.doi.org/10.30919/es8e801.

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