Isert N, Maret G, Aegerter C M
Fachbereich Physik, Universität Konstanz, Universitätsstrasse 10, 78457, Konstanz, Germany.
Eur Phys J E Soft Matter. 2013 Oct;36(10):116. doi: 10.1140/epje/i2013-13116-x. Epub 2013 Oct 17.
We study diamagnetically levitated foams with widely different liquid fractions. Due to the levitation, drainage is effectively suppressed and the dynamics is driven by the coarsening of the foam bubbles. For dry foams, the bubble size is found to increases as the square root of foam age, as expected from a generalized von Neumann law. At higher liquid content the behavior changes to that of Ostwald ripening where the bubbles grow with the 1/3 power of the age. Using Diffusing Wave Spectroscopy we study the local dynamics in the different regimes and find diffusive behavior for dry foams and kinetic behavior for wet foams.
我们研究了具有广泛不同液体分数的抗磁悬浮泡沫。由于悬浮作用，排水得到有效抑制，动力学由泡沫气泡的粗化驱动。对于干泡沫，正如广义冯·诺依曼定律所预期的那样，发现气泡尺寸随泡沫龄期的平方根增加。在较高液体含量下，行为转变为奥斯特瓦尔德熟化，此时气泡随龄期的1/3次方生长。使用扩散波谱学，我们研究了不同区域的局部动力学，发现干泡沫具有扩散行为，湿泡沫具有动力学行为。
