Abstract
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
t=(8μ/a2ρg)(h0ln(h0-h))-h)
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.
