Shoei-Sheng Chen

Bio: Shoei-Sheng Chen is an academic researcher from Argonne National Laboratory. The author has contributed to research in topics: Instability & Elastic instability. The author has an hindex of 5, co-authored 7 publications receiving 189 citations.

Flow-Induced Vibrations in Power and Process Plant Components—Progress and Prospects

Abstract: This paper provides a brief overview of progress in our understanding of flow-induced vibration in power and process plant components. The flow excitation mechanisms considered are turbulence, vorticity shedding, fluidelastic instability, axial flows, and two-phase flows. Numerous references are provided along with suggestions for future research on unresolved issues.

Chaotic Vibrations of Nonlinearly Supported Tubes in Crossflow

Abstract: By means of the unsteady-flow theory and a bilinear mathematical model, a theoretical study is presented for chaotic vibrations associated with the fluidelastic instability of nonlinearly supported tubes in a crossflow. Effective tools, including phase portraits, power spectral density, Poincare maps, Lyapunov exponent, fractal dimension, and bifurcation diagrams, are utilized to distinguish periodic and chaotic motions when the tubes vibrate in the instability region. The results show periodic and chaotic motions in the region corresponding to fluid-damping-controlled instability. Nonlinear supports, with symmetric or asymmetric gaps, significantly affect the distribution of periodic, quasiperiodic, and chaotic motions of a tube exposed to various flow velocities in the instability region of the tube-support-plate-inactive mode.

Some Issues Concerning Fluid-Elastic Instability of a Group of Circular Cylinders in Cross-Flow

Abstract: Since the early 1970s, extensive studies of fluid-elastic instability of circular cylinders in crossflow have been reported. A significant understanding of the phenomena involved now exists. However, some confusion, misunderstanding, and misinterpretation still remain. The objective of this report is to discuss, on the basis of the current state of the art, a series of the most asked questions. Emphasis is placed on the determination of the critical flow velocity, non-dimensional parameters, stability criteria, and instability mechanisms.

A Theory for Fluidelastic Instability of Tube-Support-Plate-Inactive Modes

Abstract: Fluidelastic instability of loosely supported tubes, vibrating in a tube support plate (TSP)-inactive mode, is suspected to be one of the main causes of tube failures in some operating steam generators and heat exchangers. A mathematical model, which incorporates all motion-dependent fluid-forces based on the unsteady flow theory, is presented here for fluidelastic instability of loosely supported tubes exposed to nonuniform crossflow. In the unstable region associated with a TSP-inactive mode, the tube motion can be described by two linear models: TSP-inactive mode when tubes do not contact with the TSP and TSP-active mode when tubes contact the TSP. A bilinear model, consisting of these linear models, is presented in this paper to simulate the characteristics of fluidelastic instability of loosely supported tubes in the stable and unstable region associated with TSP-inactive modes. The analytical results are compared with published experimental data; they agree reasonably well. The prediction procedure presented for fluidelastic instability response of loosely supported tubes is applicable in the stable regions of TSP-inactive mode. 25 refs., 10 figs., 2 tabs.

Flow Rate Measurements Using Flow-Induced Pipe Vibration

Abstract: This paper focuses on the possibility of a non-intrusive, low cost, flow rate measurement technique. The technique is based on signal noise from an accelerometer attached to the surface of the pipe. The signal noise is defined as the standard deviation of the frequency averaged time series signal. Experimental results are presented that indicate a nearly quadratic relationship between the signal noise and mass flow rate in the pipe. It is also shown that the signal noise - flow rate relationship is dependant on the pipe material and diameter.