Random Excitation Forces in Tube Bundles Subjected to Two-Phase Cross-Flow

Data from two experimental programs have been analyzed to determine the characteristics of the random excitation forces associated with two-phase cross-flow in tube bundles. Large-scale air-water flow loops in France and Canada were used to generate the data. Tests were carried out on cantilevered, clamped-pinned, and clamped-clamped tubes in normal-square, parallel-triangular, and normal-triangular configurations. Either strain gages or force transducers were used to measure the vibration response of a centrally located tube as the tube array was subjected to a wide range of void fractions and flow rates. Power spectra were analyzed to determine the effect of parameters such as tube diameter, frequency, flow rate, void fraction, and flow regime on the random excitation forces. Normalized expressions for the excitation force power spectra were found to be flow-regime dependent. In the churn flow regime, flow rate and void fraction had very little effect on the magnitude of the excitation forces. In the bubble-plug flow regime, the excitation forces increased rapidly with flow rate and void fraction.

[1]  P. B. Whalley,et al.  Flow patterns in vertical two-phase flow , 1985 .

[2]  M. P. Païdoussis,et al.  A review of flow-induced vibrations in reactors and reactor components , 1983 .

[3]  I. G. Currie,et al.  Vibration of Tube Bundles in Two-Phase Cross-Flow: Part 3—Turbulence-Induced Excitation , 1989 .

[4]  B. Villard,et al.  Vibration of Tube Bundles Subjected to Steam-Water Cross Flow: a Comparative Study of Square and Triangular Pitch Arrays , 1985 .

[5]  R. Welle,et al.  Void fraction, bubble velocity and bubble size in two-phase flow , 1985 .

[6]  B. Villard,et al.  Experimental Determination of Single and Two-Phase Cross Flow-Induced Forces on Tube Rows , 1988 .

[7]  R. Q. Vincent,et al.  Vibration in Nuclear Heat Exchangers Due to Liquid and Two-Phase Flow , 1981 .

[8]  F. Hara,et al.  Vibrations of two circular cylinders in tandem subjected to two-phase bubble cross flows , 1989 .

[9]  Katsuhisa Fujita,et al.  Study on the Vibrational Characteristics of a Tube Array Caused by Two-Phase Flow—Part 1: Random Vibration , 1992 .

[10]  Fumio Hara,et al.  Vibrations of Circular Cylindrical Structures Subjected to Two-Phase Cross Flows , 1987 .

[11]  J. Mcnaught.  TWO-PHASE FORCED CONVECTION HEAT-TRANSFER DURING CONDENSATION ON HORIZONTAL TUBE BUNDLES , 1982 .

[12]  J. Mastorakos,et al.  Vibration of Tube Bundles Subjected to Two-Phase Cross-Flow , 1985 .

[13]  R. D. Blevins,et al.  Flow-induced vibration in nuclear reactors: A review , 1979 .

[14]  K. Fujita,et al.  Experimental study on exciting force by two-phase cross flow , 1982 .