Examples of using Contact angle in English and their translations into Hebrew
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When it is subjected to radial load only, the contact angle is zero.
If the contact angle is measured through the gas instead of through the liquid, then it should be replaced by 180° minus their given value.
When it is only subjected to radial load, the contact angle is zero.
This predicts the contact angle of a liquid droplet on a solid surface from knowledge of the three surface energies involved.
When it is only subjected to radial load, the contact angle is zero.
The contact angle(θ), as seen in Figure 1, is the angle at which the liquid- vapor interface meets the solid- liquid interface.
When it is subjected to radial load only, the contact angle is zero.
Contact angles are equally applicable to the interface of two liquids, though they are more commonly measured in solid products such as non-stick pans and waterproof fabrics.
Determination of hydrophobicity by methanol wttability test, contact angle measurement.
A contact angle less than 90°(low contact angle) usually indicates that wetting of the surface is very favorable, and the fluid will spread over a large area of the surface.
As the tendency of a drop to spread out over a flat,solid surface increases, the contact angle decreases.
Some materials with highlyrough surfaces may have a water contact angle even greater than 150°, due to the presence of air pockets under the liquid drop.
A given system of solid, liquid, and vapor at a given temperature andpressure has a unique equilibrium contact angle.
Plants with a double structured surface like the lotus can reach a contact angle of 170°, whereby the droplet's contact area is only 0.6%.
Current-generation systems employ high resolution cameras andsoftware to capture and analyze the contact angle.
Generally, if the water contact angle is smaller than 90°, the surface is considered hydrophilic, and if the water contact angle is larger than 90°, the surface is considered hydrophobic.
Single-fiber Wilhelmy method: DynamicWilhelmy method applied to single fibers to measure advancing and receding contact angles.
If the velocity of a contact line is increased without bound, the contact angle increases, and as it approaches 180°, the gas phase will become entrained in a thin layer between the liquid and solid.
Dynamic Wilhelmy method:A method for calculating average advancing and receding contact angles on solids of uniform geometry.
Contact angles greater than 90°(high contact angle) generally means that wetting of the surface is unfavorable, so the fluid will minimize contact with the surface and form a compact liquid droplet.
If the liquid molecules are strongly attracted to the solid molecules then the liquid drop will completely spread out on the solid surface,corresponding to a contact angle of 0°.
Air trapped between the water andthe leaf surface in the spaces around the bumps increases the contact angle, an effect that is described by the Cassie-Baxter equation, named after A.B.D. Cassie and S. Baxter, who first developed it in the 1940s.
After the scientists exposed the resulting transparent coating to ultraviolet light,it had the extraordinary property of complete wettability- a contact angle of zero degrees- for both oil and water.
Even in a perfectly smooth surface, a drop will assume a wide spectrum of contact anglesranging from the so-called advancing contact angle, θ A{\displaystyle\theta_{\mathrm{A}}}, to the so-called receding contact angle, θ R{\displaystyle\theta_{\mathrm{R}}}.
This is often the case for water on bare metallic or ceramic surfaces, although the presence of an oxide layer, or contaminants,on the solid surface can significantly increase the contact angle.
In addition, he understood that the innumerable bumps take things a step further andcause the lotus surface to be superhydrophobic- the contact angle exceeds 150 degrees, and water on it forms nearly spherical droplets with very little surface contact that roll across it as easily as ball bearings would.