The Physics of Fluids

流体物理学

• 批准号: 8815803
• 负责人: Russell Donnelly
• 金额: $ 32.36万
• 依托单位: University of Oregon Eugene
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-12-15 至 1992-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8815803&HistoricalAwards=false
• 关键词: Physics; Fluids

The major thrust of this proposal is in two separate experimental areas: 1) the flow of helium 2 between rotating concentric cylinders (Couette flow) and 2) the thermal expansion of liquid helium (which is closely related to the specific heat) near the lambda transition in a well-defined confined geometry. Questions concerning helium 2 Couette flow will be investigated: first the appearance of quantized vortices in the general case (both cylinders rotating), for which a new prediction exists; second, the stability of this array of quantized vortices, also a subject of recent theoretical work. The experiment for determining the thermal expansion of liquid helium consists of measuring the dielectric constant of helium confined between plates in a high Q superconducting LC cavity. Large scale computer simulations of vortex motion in helium 2 will be pursued. Experimental work suggests that ions may excite solitons on vortices in rotating helium 2. Simulation of a tangle of vortex lines, a subject of recent controversy, will also be made.

这项建议的主要目的是在两个独立的实验 领域：1）氦气2之间的流动旋转同心 圆柱体（库埃特流）和2）液体的热膨胀 氦（与比热密切相关）靠近 λ过渡在一个定义明确的有限的几何形状。 问题 关于氦2库埃特流将被调查：首先， 在一般情况下出现量子化涡旋（两者 圆柱体旋转），对此存在新的预测;第二， 这种量子化涡旋阵列的稳定性也是一个主题 最近的理论工作。 测定该化合物的 液氦的热膨胀包括测量 在高Q值条件下板间氦的介电常数 超导LC腔 大规模计算机模拟 氦2中的涡流运动将继续进行。 实验工作 表明，离子可以激发孤子的涡旋旋转 氦2 涡旋线缠结的模拟， 最近的争议，也将作出。