scholarly journals Change in Wettability by Plasma Irradiation and Evaporation of Water Drop

2002 ◽  
Vol 2002 (0) ◽  
pp. 75-76
Author(s):  
Sumitomo HIDAKA ◽  
Hiroshi YAMAMOTO ◽  
Akimitu YAMASHITA ◽  
Yasuyuki TAKATA ◽  
Takehiro ITO
Keyword(s):  
Water Drop ◽  
Plasma Irradiation

B219 Change in Contact Angle by Plasma Irradiation and Evaporation of Water Drop

2001 ◽  
Vol 2001 (0) ◽  
pp. 417-418
Author(s):  
Sumitomo HIDAKA ◽  
Yasuyuki TAKATA ◽  
Takehiro ITO
Keyword(s):  
Contact Angle ◽  
Water Drop ◽  
Plasma Irradiation

THE MECHANISM OF HEAT AND MASS TRANSFER BETWEEN A WATER DROP AND A HEATED SURFACE

1978 ◽  
Author(s):  
M. A. Styrikovich ◽  
Yu. V. Baryshev ◽  
G.V. Tsiklauri ◽  
M.E. Grigorieva
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Water Drop ◽  
Heated Surface

Reply to “Comments on ‘Energy Dissipation During Water Drop Impact In Shallow Pools’”

1986 ◽  
Vol 50 (6) ◽  
pp. 1644-1645
Author(s):  
Alfredo G. Ferreira ◽  
Bruce E. Larock ◽  
Michael J. Singer
Keyword(s):  
Energy Dissipation ◽  
Water Drop ◽  
Drop Impact

EVALUATING STABILITY OF FOUNDATION AROUND WATER DROP WORKS WITH A HYDRAULIC-GEOTECHNICAL COMBINED METHOD

2018 ◽  
Vol 74 (5) ◽  
pp. I_655-I_660
Author(s):  
Hongxuan YANG ◽  
Yutaka FUKUMOTO ◽  
Tokuzo HOSOYAMADA ◽  
Satoru OHTSUKA
Keyword(s):  
Water Drop ◽  
Combined Method

scholarly journals Quantifying erosion and retention of silicon carbide due to D plasma irradiation in a high-flux linear plasma device

2021 ◽  
Vol 26 ◽  
pp. 100939
Author(s):  
G. Sinclair ◽  
T. Abrams ◽  
S. Bringuier ◽  
D.M. Thomas ◽  
L. Holland ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
High Flux ◽  
Plasma Irradiation ◽  
Plasma Device ◽  
Linear Plasma

scholarly journals Ice Coverage Induced by Depositing a Water Drop onto the Supercooled Substrate at Extreme Low Vapor Pressure

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 691
Author(s):  
Yugang Zhao ◽  
Zichao Zuo ◽  
Haibo Tang ◽  
Xin Zhang
Keyword(s):  
Vapor Pressure ◽  
Substrate Temperature ◽  
Water Drop ◽  
Industrial Processes ◽  
Aircraft Icing ◽  
Ice Coverage ◽  
Fundamental Understanding ◽  
Order Of Magnitude ◽  
The Impact ◽  
Kinetics Of

Icing/snowing/frosting is ubiquitous in nature and industrial processes, and the accretion of ice mostly leads to catastrophic consequences. The existing understanding of icing is still limited, particularly for aircraft icing, where direct observation of the freezing dynamics is inaccessible. In this work, we investigate experimentally the impact and freezing of a water drop onto the supercooled substrate at extremely low vapor pressure, to mimic an aircraft passing through clouds at a relatively high altitude, engendering icing upon collisions with pendant drops. Special attention is focused on the ice coverage induced by an impinging drop, from the perimeter pointing outward along the radial direction. We observed two freezing regimes: (I) spread-recoil-freeze at the substrate temperature of Ts = −15.4 ± 0.2 °C and (II) spread (incomplete)-freeze at the substrate temperature of Ts = −22.1 ± 0.2 °C. The ice coverage is approximately one order of magnitude larger than the frozen drop itself, and counterintuitively, larger supercooling yields smaller ice coverage in the range of interest. We attribute the variation of ice coverage to the kinetics of vapor diffusion in the two regimes. This fundamental understanding benefits the design of new anti-icing technologies for aircraft.

scholarly journals Spreading and Drying Dynamics of Water Drop on Hot Surface of Superwicking Ti-6Al-4V Alloy Material Fabricated by Femtosecond Laser

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 899
Author(s):  
Ranran Fang ◽  
Zekai Li ◽  
Xianhang Zhang ◽  
Xiaohui Zhu ◽  
Hanlin Zhang ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Surface Structure ◽  
Energy Savings ◽  
Water Drop ◽  
Capillary Surface ◽  
Water Flow Velocity ◽  
Capillary Action ◽  
Practical Applications ◽  
Alloy Material ◽  
Hot Surface

A superwicking Ti-6Al-4V alloy material with a hierarchical capillary surface structure was fabricated using femtosecond laser. The basic capillary surface structure is an array of micropillars/microholes. For enhancing its capillary action, the surface of the micropillars/microholes is additionally structured by regular fine microgrooves using a technique of laser-induced periodic surface structures (LIPSS), providing an extremely strong capillary action in a temperature range between 23 °C and 80 °C. Due to strong capillary action, a water drop quickly spreads in the wicking surface structure and forms a thin film over a large surface area, resulting in fast evaporation. The maximum water flow velocity after the acceleration stage is found to be 225–250 mm/s. In contrast to other metallic materials with surface capillarity produced by laser processing, the wicking performance of which quickly degrades with time, the wicking functionality of the material created here is long-lasting. Strong and long-lasting wicking properties make the created material suitable for a large variety of practical applications based on liquid-vapor phase change. Potential significant energy savings in air-conditioning and cooling data centers due to application of the material created here can contribute to mitigation of global warming.

scholarly journals Strain-dependent wicking behavior of cotton/lycra elastic woven fabric for sportswear

e-Polymers ◽  
2021 ◽  
Vol 21 (1) ◽  
pp. 263-271
Author(s):  
Yong Wang ◽  
Qifan Qiao ◽  
Zuowei Ding ◽  
Fengxin Sun
Keyword(s):  
Tensile Strain ◽  
Water Drop ◽  
Woven Fabric ◽  
Strengthening Effect ◽  
Wetting Time ◽  
Horizontal Wicking ◽  
Different Strains ◽  
Strain Dependent ◽  
Different Levels ◽  
Strain Strengthening

Abstract The strain-dependent vertical and horizontal wicking of as-prepared cotton/lycra elastic woven fabric was systematically studied. The experimental results revealed that the fabric exhibited a strain strengthening effect. A higher tensile strain results in a higher equilibrium wicking height, and vice versa. Moreover, the results indicated that the proposed Laughlin–Davies model is capable of tracking well the experimental data and replicating the wicking characteristics of fabric under different levels of stretch. In addition, the wetting time and wicking area of fabric under different strains and height regimes were examined during horizontal wicking. It was found that the wetting time decreased with an increase of strain and/or water drop height. The strain-enhanced and height-weakened effects of wicking area were revealed. The spreading mechanism of water drop in elastic fabric was also proposed. Such fundamental work provides a basic support for the in-depth investigation of wicking behavior of complex stretchable textile structures.

scholarly journals Fluence Dependence of Surface Morphology and Deuterium Retention in W Bulks and Nanocrystalline W Films Exposed to Deuterium Plasma

2021 ◽  
Vol 11 (4) ◽  
pp. 1619
Author(s):  
Jing Yan ◽  
Xia Li ◽  
Kaigui Zhu
Keyword(s):  
Surface Morphology ◽  
Thermal Desorption Spectroscopy ◽  
Low Energy ◽  
High Flux ◽  
Deuterium Plasma ◽  
Vacancy Clusters ◽  
Plasma Irradiation ◽  
Deuterium Retention ◽  
Fluence Dependence ◽  
Scanning Electron

The surface morphology of pure W bulks and nanocrystalline tungsten films was investigated after exposure to a low-energy (100 eV/D), high-flux (1.8 × 1021 D·m−2s−1) deuterium plasma. Nanocrystalline tungsten films of 6 μm thickness were deposited on tungsten bulks and exposed to deuterium plasma at various fluences ranging from 1.30 × 1025 to 5.18 × 1025 D·m−2. Changes in surface morphology from before to after irradiation were studied with scanning electron microscopy (SEM). The W bulk exposed to low-fluence plasma (1.30 × 1025 D·m−2) shows blisters. The blisters on the W bulk irradiated to higher-fluence plasma are much larger (~2 µm). The blisters on the surface of W films are smaller in size and lower in density than those of the W bulks. In addition, the modifications exhibit the appearance of cracks below the surface after deuterium plasma irradiation. It is suggested that the blisters are caused by the diffusion and aggregation of the deuterium-vacancy clusters. The deuterium retention of the W bulks and nanocrystalline tungsten films was studied using thermal desorption spectroscopy (TDS). The retention of deuterium in W bulks and W films increases with increasing deuterium plasma fluence when irradiated at 500 K.

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