Abstract
Twin vortices flow behavior with out-of-plane angle effect in double bent pipe system is studied numerically and experimentally. Double bent pipe system generates very complicated flow behavior including twin vortices in the downstream of the double bent. Moreover, angle from the plane of the double bent forms more complicated flow behavior due to the flow twist by out-of-plane angle. In this study, numerical analysis is examined for this double bent system using three-dimensional CFD code, FLUENT, to reproduce those complicated flow behaviors with twin vortices. Numerical results are compared with experimental results obtained by Ultrasonic Velocity Profiler (UVP). Discrepancy between numerical and experimental result is discussed changing out-of- plane angle, α. Velocity profiles obtained by numerical results are converted into UVP profiles, and they are compared with the experimental results by UVP. Consequently, velocity behavior especially around the pipe wall obtained by numerical results is agreed with experimental results.
Highlights
Nowadays many engineering plants are utilized in the world
Comparison between Experimental and Numerical. Comparison between these numerical data and experimental data is executed to confirm the accuracy of the calculation results
Profiles of velocity components along the measurement lines are reproduced by using numerical results
Summary
Nowadays many engineering plants are utilized in the world. In these plants, materials and energy are supplied to the fabricating machinery, and products are fabricated. Three velocity profiles obtained by UVP from different circumferential direction were applied for the calculation of flowrate with circumferential interpolation [9], and they concluded that calculation error is only around 3% even at the position of 3 D (D: diameter of the pipe) after the double bent. One-dimensional UVP observation is applied for the double bent pipe system with many measurements from different positions/angles They are only parts of the flow behavior. Numerical analysis using computational fluid dynamics (CFD) code, FLUENT, is examined and detail flow behavior of complicated flow generated by double bent is studied from the numerical data These numerical analyses execute with fine mesh, and detail three-dimensional velocity profiles are obtained. The numerical results are compared with experimental results obtained by UVP, and the accuracy of the numerical analyses is discussed
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