Uploaded July 2022 | Updated September 2026, 58 minutes ago
The squeeze film damping effect is one of the main limits in various precision experiments, such as the study of disturbances on the test mass in space gravitational wave detection, and its physical mechanism is still an open question. We developed a torsion pendulum to measure the damping effects caused by Brownian motion of the residual gas between a cubic test mass and a pair of symmetric movable plates. The experimental results are consistent with a model of the combination of elastic and inelastic collisions with a thermal accommodation coefficient (TAC), and the pressure dependence of the TAC is observed, which is given by a fitting of σ=σ_0 e^(-λp)+σ_∞. This phenomenon indicates that the macroscopic effect of squeeze film damping arises from two different microscopic collision mechanisms, where the elastic collision is the simple bounce of residual gas molecules on the solid surface, and the inelastic collision reflects the process of adsorption and desorption of gas molecules on the solid surface. The ratio of these contributions depends on the saturation of the adsorbed gases.
Authors:
Dr. Li Liu (Presenting)
Huazhong University of Science and Technology, Wuhan, China
0000-0003-4337-6799
Yujie Zhao
Huazhong University of Science and Technology, Wuhan, China
Dr. Dingyin Tan
Huazhong University of Science and Technology, Wuhan, China
Dr. Hang Yin
Huazhong University of Science and Technology, Wuhan, China
Dr. Chenggang
Huazhong University of Science and Technology, Wuhan, China
Dr. Zebing Zhou
Huazhong University of Science and Technology, Wuhan, China
The squeeze film damping effect is one of the main limits in various precision experiments, such as the study of disturbances on the test mass in space gravitational wave detection, and its physical mechanism is still an open question. We developed a torsion pendulum to measure the damping effects caused by Brownian motion of the residual gas between a cubic test mass and a pair of symmetric movable plates. The experimental results are consistent with a model of the combination of elastic and inelastic collisions with a thermal accommodation coefficient (TAC), and the pressure dependence of the TAC is observed, which is given by a fitting of σ=σ_0 e^(-λp)+σ_∞. This phenomenon indicates that the macroscopic effect of squeeze film damping arises from two different microscopic collision mechanisms, where the elastic collision is the simple bounce of residual gas molecules on the solid surface, and the inelastic collision reflects the process of adsorption and desorption of gas molecules on the solid surface. The ratio of these contributions depends on the saturation of the adsorbed gases.
Authors:
Dr. Li Liu (Presenting)
Huazhong University of Science and Technology, Wuhan, China
0000-0003-4337-6799
Yujie Zhao
Huazhong University of Science and Technology, Wuhan, China
Dr. Dingyin Tan
Huazhong University of Science and Technology, Wuhan, China
Dr. Hang Yin
Huazhong University of Science and Technology, Wuhan, China
Dr. Chenggang
Huazhong University of Science and Technology, Wuhan, China
Dr. Zebing Zhou
Huazhong University of Science and Technology, Wuhan, China
