... tube damage caused by in-plane fluidelastic instability (FEI) in the U-bend regions of new replacement recirculating steam generators (SG). The measurements were intended to assess the applicability of existing design guidelines for estimating the support-related damping of a tube. In the tests...

...Amro Elhelaly; Marwan Hassan; David Weaver; Jovica Riznic; Soha Moussa One of the major considerations in the design and operation of heat exchangers is the flow-induced vibration (FIV). While there are multiple FIV excitation mechanisms, fluidelastic instability (FEI) is by far the most crucial...

...Amro Elhelaly; Marwan Hassan; David Weaver; Jovica Riznic; Soha Moussa This work presents the results of an experimental investigation of fluidelastic instability (FEI) in a normal triangular array. Several tube array configurations were considered, including a single flexible tube, a row of three...

...Amro Elhelaly; Marwan Hassan; David Weaver; Jovica R. Riznic; Soha Moussa To better explain the basic aspects of fluidelastic instability (FEI) in tube arrays, a rigorous research program has been initiated. In this research, the authors executed a series of water-flow experiments utilizing a fully...

...Wei Tan; Peng Ren; Yuqi Wang; Yue Wang; Guorui Zhu This technical brief is an experimental study, which used a water tunnel to investigate the fluidelastic instability of tube bundles with asymmetric stiffness. The natural frequency ratios (streamwise/transverse) of the tubes are 50%, 60%, 70...

...Omar Sadek; Atef Mohany; Marwan Hassan For decades, fluidelastic instability (FEI) has been known to cause dramatic mechanical failures in tube bundles. Therefore, it has been extensively studied to mitigate its catastrophic consequences. Most of these studies were conducted in controlled...

... of the fluidelastic instability. Although identical fluidelastic forces are simulated by using the two conventions, Tanaka's convention is recommended due to its compatibility with the quasi-steady theory and optimal resolutions of data plots over any range of reduced flow velocities. References [1...

...J. Wang; D. S. Weaver An experimental study was carried out to investigate fluidelastic instability in finned tube bundles in normal and parallel triangular arrays. Three arrays of each geometry type were studied experimentally: two arrays with serrated, helically wound finned tubes of different...