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• W797503980 abstract "In the refrigeration systems using the two-phase flow ejector, it is important to understand expansion waves and shock waves which are generated at the outlet of the nozzle. The theoretical oblique shock wave relations are derived for extreme conditions. Numerical analysis of the oblique twophase flow is also presented. Two types of two dimensional convergent-divergent nozzles with and without the inclined wall are used to measure pressure profiles along the nozzles wall. The two-phase flow in the divergent section of the nozzle obviously exhibits the supersonic decompression behavior. Numerical results can represent the experimental results with fairly good precision, but the reflections of the oblique shock wave cannot be predicted. The diameter of the droplet in twophase flow in the nozzle is guessed by this experiment to be the order of 5 [μm] and momentum frozen phenomenon occurs in this situation. The experimental oblique shock wave has the particular character of the two-phase flow, which is never seen in single phase flow explained by gas dynamics. The observation of the present study reveals the intrinsic feature that appears only in the supersonic two-phase flow. INTRODUCTION The compressible two-phase flow is applied to many fields, such as geothermal power plants and refrigeration cycles. As the sound speed of the two-phase flow is low [1] compare with that of the single phase, the two-phase flow can be easily accelerated to the supersonic state and there appear shock waves. We have been studying on the supersonic two-phase flow in the ejector [2] which can improve the efficiency of the carbon dioxide refrigeration system by converting the exhausted expansion energy into the useful compression energy. The carbon dioxide is the most hopeful refrigerant because of the low global warming. While the Global Warming Potential of the R-134a is 1500, that of the carbon dioxide is 1 from the definition. The oblique shock waves occur in the supersonic two-phase flow at the outlet of the nozzle in the ejector and the two-phase flow fields in the mixing section are affected by those waves. The one of the most important functions of the two-phase flow ejector is to compress the sucked refrigerant vapour from the evaporator and to assist the compressor. The recovered pressure depends largely on the kinetic energy of the two-phase flow at the mixing section. We have been developing the ejector in the refrigeration cycle [3] and fundamentally researching on the characteristic of two-dimensional expansion waves [4][5] and oblique shock waves [6] in order to clarify the character of waves which occur in high speed two-phase flow. The object of the present study is to elucidate the behaviour of the oblique shock waves of the carbon dioxide two-phase flow from experiments and analyses." @default.
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• W797503980 date "2012-01-01" @default.
• W797503980 modified "2023-09-26" @default.
• W797503980 title "Investigation on oblique shock waves occurred in the supersonic carbon dioxide two-phase flow" @default.
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