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Date of Publication:2018-01-01

Journal:西安交通大学学报

Volume:52

Issue:9

Page Number:64-70

ISSN No.:0253-987X

Abstract:Aiming at the flow instability in regenerative cooling technology, the hydrodynamic feature of super-critical hydrocarbon is studied experimentally. The results show that multi-valued hydrodynamic feature exists in super-critical fluid. The multi-valued feature weakens with the increasing system pressure and inlet temperature, but strengthens with the increasing heat flux. In addition, decreasing tube length or increasing tube internal diameter can improve the multi-valued hydrodynamic feature so as to enhance flow stability. According to the experimental data, a correlation is obtained by dimensionless method to predict the onset of flow instability (OFI) for super-critical fluid. The correlation consists of only three dimensionless parameters, but contains five important parameters affecting OFI. The error between the numerical and the experimental results gets within 10%. © 2018, Editorial Office of Journal of Xi'an Jiaotong University. All right reserved.

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