Simulation of the Microgravity Effect on Wettability of Solids with Different Liquids

Naidich, Yu. V.; Gab, I. I.; Stetsyuk, T. V.; Kostyuk, B. D.

doi:10.1007/s11106-017-9860-1

Cited by 3 publications

(2 citation statements)

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“…Recently, Bormashenko imposing the transversality conditions on the variational problem of wetting also demonstrates that gravity does not influence equilibrium contact angles [35][36][37]. However, many experimental observations [15][16][17][18][19][20][21][22][23][24][25][26][27] under some gravities (≤2G) differed from these theoretical conclusions. This discrepancy becomes an important issue, especially in the space era, when interfacial phenomena frequently draw more attention because they are dominant events in microgravity and much different from those observed on Earth.…”

Section: Introductionmentioning

confidence: 99%

“…The contact angles on these low contact angle hysteresis surfaces are very close to Young's contact angle. Previous experimental studies [15][16][17][18][19][20][21][22][23][24][25][26][27]43] at different gravities used ordinary surfaces. Thus, the results of the effect of gravity on the contact angle may be caused by contact angle hysteresis.…”

Section: Introductionmentioning

confidence: 99%

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The Possibility of Changing the Wettability of Material Surface by Adjusting Gravity

Liu

Bao

et al. 2020

Research

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The contact angle, as a vital measured parameter of wettability of material surface, has long been in dispute whether it is affected by gravity. Herein, we measured the advancing and receding contact angles on extremely low contact angle hysteresis surfaces under different gravities (1-8G) and found that both of them decrease with the increase of the gravity. The underlying mechanism is revealed to be the contact angle hysteresis and the deformation of the liquid-vapor interface away from the solid surface caused by gradient distribution of the hydrostatic pressure. The real contact angle is not affected by gravity and cannot measured by an optical method. The measured apparent contact angles are angles of inclination of the liquid-vapor interface away from the solid surface. Furthermore, a new equation is proposed based on the balance of forces acting on the three-phase contact region, which quantitatively reveals the relation of the apparent contact angle with the interfacial tensions and gravity. This finding can provide new horizons for solving the debate on whether gravity affects the contact angle and may be useful for the accurate measurement of the contact angle and the development of a new contact angle measurement system.

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