Heat flux-flow coupling effects in the stability of vapour generators |
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| Authors: | C D Rakopoulos MSc D I C PhD A A El-Shirbini MSc D I C PhD W Murgatroyd M A PhD C Eng M I E E |
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| Institution: | (1) Department of Mechanical Engineering, Imperial College of Science and Technology, Exhibition Road, SW7 2BX London;(2) Present address: National Technical University, Athens, Greece |
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| Abstract: | A study has been carried out to investigate the dynamics of two-phase flow in vapour generators, with special reference to the effect of flux-flow couplings on density wave instability. A distributed parameter time-varying theoretical analysis of the conservation equations, together with the constitutive laws of two-phase flow, has been derived. The analysis takes into account the dynamics of the heater wall, revealing the predominant role of the heat flux-flow couplings on the stability of the system. A digital computer program has been written and developed to implement the theoretical analysis. Results from the analysis are used for comparison with the available data and the effect of the flux-flow couplings on instability is demonstrated and discussed. These results are also used to explain the dynamic behaviour of a specially constructed “Arcton-113”1 closed loop comprising a helical, electrically heated, once-through vapour generator in a parallel channel arrangement with high thermal capacitance. Kopplungseffekte zwischen Wärmefluß und Strömung bei der Stabilität von Dampferzeugern |
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