Experimental study of effect of incident angle variation on flow induced Vibration response of normal triangle array in cross-flow
Flow induced vibrations (FIV) in heat exchangers and steam generator is one of the main problems, the present industry is facing over past few decades. Vibration is of major concern for designers, process engineers and operators. The amplitude of these vibrations becomes high, it will cause serious damage like fretting wear and necking failure of tubes. In order reduce the chances of failure; a great deal of research has been carried in the field of flow induced vibration in heat exchanger tube bundle. In the current study, vibration response is analyzed on central tube in normal triangular tube bundle having P/D=1.45. The array has been arranged at 7 different angles (0 to 90 degrees) perpendicular to the direction of flow. The experiments were conducted on a wind tunnel; the free stream velocity varies from 1 m/s to 6 m/s. Results are discussed with respect to the seven different angles (0 to 90 degrees) and variation in velocity. The maximum RMS amplitude is almost 2 % and it is observed in case of 60%. It can be say that the 60 degree configuration offers high vibration level when subjected to cross flow as compared to other angle configurations while 0 degree configurations offers lowest vibration level in cross flow. The current experimental data shows a good agreement with the previous theoretical boundaries and previous experimental data reported in the research. From the results it can be concluded that 0 degree configuration have the best results, so normal triangular tube bundle is suitable for heat exchanger as from the previous literature.
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