Collisions between pulses of traveling-wave convection.
Collisions between pulses of traveling-wave convection.
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行波对流脉冲之间的碰撞。
DOI：
10.1103/physreva.44.6466
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发表时间：
1991
期刊：
影响因子：
--
通讯作者：
Kolodner
中科院分区：
文献类型：
--
作者：
Kolodner
在狭窄几何形状中具有中等负分离比的二元流体中行波对流的第一个非线性状态由“脉冲”组成：空间形状固定的局部对流斑块，并且以取决于局部瑞利数的速度漂移。我介绍了两种行波脉冲实验的结果。首先，我研究了脉冲漂移经过瑞利数中狭窄、固定的峰值时的行为。脉冲对远远超出脉冲主体前方的空间域中的瑞利数敏感。其次，我研究反向传播脉冲对之间的碰撞，作为它们相互接近的速度的函数。在高接近速度下，只有一个脉冲在碰撞中幸存下来。在低接近速度下，形成持久的双峰结构。在某些情况下，这种结构可以解释为两个脉冲的弱束缚态。
The first nonlinear state of traveling-wave convection in binary fluids with moderate negative separation ratio in a narrow geometry consists of ``pulses'': localized patches of convection whose spatial shape is fixed, and that drift at a velocity that depends on the local Rayleigh number. I present the results of two kinds of experiments on traveling-wave pulses. First, I study the behavior of pulses as they drift past narrow, fixed peaks in Rayleigh number. The pulses are sensitive to the Rayleigh number in a spatial domain that extends far ahead of the main body of the pulse. Second, I study collisions between pairs of counterpropagating pulses as a function of the velocity with which they approach one another. At high approach velocity, only one pulse survives the collision. At low approach velocity, a persistent double-peaked structure is formed. Under certain circumstances, this structure can be interpreted as a weakly bound state of two pulses.