ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Rate of Capillary Rise in the Porous Media under Microgravity
Yuichi KanekiYasushi SasakiKuniyoshi IshiiManabu Iguchi
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2000 Volume 40 Issue Suppl Pages S160-S163


The capillary flow rate through the porous glass media under microgravity was measured by using the drop-shaft type microgravity facility of Japan Microgravity Center. Based on a simple model, the rate of the capillary rise rate of liquids was developed and expressed by
h0=2σ cosθ/aρg
where t is time, μ is a viscosity coefficient, a is a capillary radius, ρ is a density, g is the gravitational constant, h is a capillary rise distance and h0 is the equilibrium rise distance.
The behavior of the capillary rise in the porous media under microgravity is reasonably explained by the developed equation. But, the capillary rise along the vertical direction under normal gravity did not agree with the equations, and this disagreement was discussed based on the dynamic contact angle. It is estimated that the dynamic contact angle under μG will be different from that under 1G.

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