The effect of the VOF–CSF static contact angle boundary condition on the dynamics of sliding and bouncing ellipsoidal bubbles

摘要: Abstract The static contact angle is the only empiricism introduced in a Volume of Fluid–Continuum Surface Force (VOF–CSF) model bubbly flow. Although it has previously been shown to have relatively limited effect on accuracy velocity and shape predictions case large gas bubbles sliding under inclined walls (e.g. Cook Behnia, 2001 ), may more determining influence numerical prediction dynamics smaller ellipsoidal which were by Tsao Koch (1997) bounce repeatedly when at certain wall inclinations. present paper reports surface tension an air bubble equivalent diameter De = 3.4 mm. Eotvos Morton numbers are Eo = 1.56 Mo = 2 × 10−11 respectively. computational results achieved with Piecewise Linear Construction (PLIC) interface reviewed reference experimental measurements oscillations recorded using high speed digital camera. Tests performed plate inclination angles θ ∈ {10°, 20°, 30°, 45°} horizontal models consider three θc ∈ {10°, 20°, 30°}. found significant but varying degree depending inclination. It promote lift off bouncing reaches 30° way that does not necessarily reflect observations.