scholarly journals Novel Superhydrophobic Surface with Solar-Absorptive Material for Improved De-Icing Performance

Materials ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 2758 ◽  
Author(s):  
Joseph Gonzales ◽  
Daiki Kurihara ◽  
Tetsuro Maeda ◽  
Masafumi Yamazaki ◽  
Takahito Saruhashi ◽  
...  
Keyword(s):  
Solar Radiation ◽  
Power Consumption ◽  
Superhydrophobic Surface ◽  
Radiation Absorption ◽  
Melting Time ◽  
Ice Accretion ◽  
Superhydrophobic Coating ◽  
Heating Source ◽  
Consumption Reduction ◽  
Ice Conditions

Ice accretion is detrimental to numerous industries, including infrastructure, power generation, and aviation applications. Currently, some of the leading de-icing technologies utilize a heating source coupled with a superhydrophobic surface. This superhydrophobic surface reduces the power consumption by the heating element. Further power consumption reduction in these systems can be achieved through an increase in passive heat generation through absorption of solar radiation. In this work, a superhydrophobic surface with increased solar radiation absorption is proposed and characterized. An existing icephobic surface based on a polytetrafluoroethylene (PTFE) microstructure was modified through the addition of graphite microparticles. The proposed surface maintains hydrophobic performance nearly identical to the original superhydrophobic coating as demonstrated by contact and roll-off angles within 2.5% of the original. The proposed graphite coating also has an absorptivity coefficient under exposure to solar radiation 35% greater than typical PTFE-based coatings. The proposed coating was subsequently tested in an icing wind tunnel, and showed an 8.5% and 50% decrease in melting time for rime and glaze ice conditions, respectively.

The ROM Design with Half Grouping Compression Method for Chip Area and Power Consumption Reduction

2009 ◽  
Vol E92-C (3) ◽  
pp. 352-355
Author(s):  
Ki-Sang JUNG ◽  
Kang-Jik KIM ◽  
Young-Eun KIM ◽  
Jin-Gyun CHUNG ◽  
Ki-Hyun PYUN ◽  
...  
Keyword(s):  
Power Consumption ◽  
Compression Method ◽  
Chip Area ◽  
Consumption Reduction

scholarly journals Gas Heating Mechanisms in Atmospheric Pressure Helium Dielectric-Barrier Discharges Driven by a kHz Power Source

2020 ◽  
Vol 10 (21) ◽  
pp. 7583
Author(s):  
Kun-Mo Lin ◽  
Kai-Cheng Wang ◽  
Yao-Sheng Chang ◽  
Shun-Yu Chuang
Keyword(s):  
Power Consumption ◽  
Joule Heating ◽  
Atmospheric Pressure ◽  
Power Efficiency ◽  
Rotational Temperature ◽  
Elastic Collision ◽  
Dielectric Barrier Discharges ◽  
Dielectric Barrier ◽  
Heating Source ◽  
Barrier Discharges

The present work investigates contributions of different heating mechanisms and power efficiency of atmospheric-pressure helium dielectric-barrier discharges (APHeDBDs) containing a small amount of N2 for temperature measurements by developing the numerical methodology combining the one-dimensional (1D) plasma fluid model (PFM) and 3D gas flow model (GFM) with simulated results validated by measurements including the discharge power consumption and temperature distribution. The discharge dynamics are modeled by the 1D PFM for evaluating the average heating source considering elastic collision, ion Joule heating, and exothermic reactions as the source term of energy equation solved in the 3D GFM. The simulated current density reaches 29 A m−2 which is close to that measured as 35 A m−2. The simulated power consumption is 2.0 W which is in good agreement with the average measured power consumption as 2.1 W. The simulated average gas temperature in the reactive zone is around 346 K which is also close to the rotational temperature determined. The analysis shows that elastic collision and ion Joule heating are dominant heating mechanisms contributing 23.9% and 65.8% to the heating source, respectively. Among ion species, N2+ and N4+ are dominant species contributing 44.1% and 50.7% to the heating source of ion Joule heating, respectively. The simulated average total heating source is around 5.6 × 105 W m−3 with the maximum reaching 3.5 × 106 W m−3 in the sheath region due to the contribution of ion Joule heating.

Mechanically robust superhydrophobic coating for aeronautical composite against ice accretion and ice adhesion

2019 ◽  
Vol 176 ◽  
pp. 107267 ◽  
Author(s):  
Wei Tong ◽  
Dangsheng Xiong ◽  
Nan Wang ◽  
Zhen Wu ◽  
Huangjie Zhou
Keyword(s):  
Ice Accretion ◽  
Superhydrophobic Coating ◽  
Ice Adhesion

scholarly journals Effective Harmful Organism Management I: Fabrication of Facile and Robust Superhydrophobic Coating on Fabric

2020 ◽  
Vol 12 (15) ◽  
pp. 5876
Author(s):  
Chang-Ho Choi ◽  
Yeongwon Kwak ◽  
Min Kyung Kim ◽  
Dong Gun Kim
Keyword(s):  
Epoxy Resin ◽  
Superhydrophobic Surface ◽  
Coating Layer ◽  
Sio2 Nanoparticles ◽  
Research Subject ◽  
Superhydrophobic Coating ◽  
Promising Alternative ◽  
Salty Water ◽  
Slide Angle ◽  
Conventional Coating

Advances in harmful organism management are highly demanding due to the toxicity of conventional coating approaches. Exploiting biomimetic superhydrophobicity could be a promising alternative on account of its cost-effectiveness and eco-friendliness. Here, we introduce a facile method to fabricate a robust superhydrophobic coating on a fabric substrate. This is achieved by sequentially spraying TiO2-epoxy resin nanocomposite material and fluorocarbon-silane modified SiO2 nanoparticles (FC-silane SiO2 NPs). The superhydrophobicity is attributed to the nanoparticles constituting a micro/nano hierarchical structure and the fluorocarbon of the modified SiO2 NPs lowering the surface energy. The epoxy resin embedded in the coating layer plays an important role in improving the robustness. The robustness of the superhydrophobic surface is demonstrated by measuring the water slide angle of surfaces that are subject to salty water at 500 rpm stirring condition for up to 13 days. This study focuses on ensuring the superhydrophobicity and robustness of the coating surface, which is preliminary work for the practical management of macrofoulers. Based on this work, we will perform practical harmful organism management in seawater as a second research subject.

Power consumption reduction through elastic data rate adaptation in survivable multi-layer optical networks

2014 ◽  
Vol 28 (3) ◽  
pp. 276-286 ◽  
Author(s):  
Jordi Perelló ◽  
Annalisa Morea ◽  
Salvatore Spadaro ◽  
Albert Pagès ◽  
Sergio Ricciardi ◽  
...  
Keyword(s):  
Power Consumption ◽  
Optical Networks ◽  
Rate Adaptation ◽  
Data Rate ◽  
Consumption Reduction ◽  
Elastic Data

Solar Radiation Effect on a Magneto Nanofluid Flow in a Porous Medium with Chemically Reactive Species

2018 ◽  
Vol 16 (9) ◽  
Author(s):  
Mohamed R. Eid ◽  
O.D. Makinde
Keyword(s):  
Porous Medium ◽  
Solar Radiation ◽  
Saturated Porous Medium ◽  
Surface Concentration ◽  
Radiation Absorption ◽  
Physical Parameters ◽  
Radiation Chemical ◽  
Electrically Conducting ◽  
Special Cases ◽  
Chemically Reactive Species

Abstract The combined impact of solar radiation, chemical reaction, Joule heating, viscous dissipation and magnetic field on flow of an electrically conducting nanofluid over a convectively heated stretching sheet embedded in a saturated porous medium is simulated. By using appropriate similarity transformation, the governing nonlinear equations are converted into ODEs and numerical shooting technique with (RK45) method is employed to tackle the problem. The effects of various thermo-physical parameters on the entire flow structure with heat and mass transfer are presented graphically and discussed quantitatively. Special cases of our results are benchmarked with some of those obtained earlier in the literature and are found to be in excellent agreement. It is found that both the temperature and surface concentration gradients are increasing functions of the non-Darcy porous medium parameter. One describing result is the incident solar radiation absorption and its transmission into the working nanofluid by convection.

Sign in / Sign up

Export Citation Format

Share Document