Analysis of Density Wave Oscillations in a Boiling Channel by a New Analytical Model

Document Type : Research Article

Authors

Department of Mech. Eng., K. N. Toosi University of Technology, Tehran, Iran.

Abstract

Two-phase flow instabilities are observed in many areas of industrial applications such as turbomachinery, refrigeration systems, water boiling reactors and similar systems. Predicting fluid flow parameters such as pressure drop, stability region during boiling and oscillation characteristics are the determining factors in the design of two-phase flow equipment. In this paper, density wave oscillations type instability in boiling process is analyzed. By introducing appropriate dimensionless variables, an integrated model for the process is presented. The model is solved for steady state response of the system by using numerical analysis of a developed numerical method based on weighted residual method. Stability region is determined in reaction frequency versus ratio of reaction frequency to inlet mass flow plane. In addition, friction number effect on stability threshold is assessed. The effect of mass flow rate, inlet subcooling, system pressure and other important process parameters on the oscillation characteristics as well as the instability boundary are investigated. The results show that with increasing mass flow, the system becomes more stable for density wave oscillations occurrence. The critical quality of the exhaust vapor also decreases with increasing mass flow. On the other hand, the period of oscillations and its amplitude increases with increasing mass flow.

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Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 3
June 2021
Pages 1505-1520

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