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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Experimental Study on the Temperature and Pressure Distribution of Steam Jet in Subcooled Water Flow in a Restricted Channel

Get access (open in a dialog) DOI: 10.1615/IHTC15.tpm.008935
pages 8607-8616

Resumo

The phenomenon of direct contact condensation (DCC) occurred when steam injected into subcooled water, which is utilized in several industrial applications, such as nuclear energy, electric power, petrochemical etc. Researches on hydrodynamics and heat transfer characteristics of DCC are of great importance in equipment design and safe operation. DCC in axial symmetry channel has been experimentally studied in many previous researches, but for the reason of spatial structure, the details of DCC could hardly accurately obtained. Thus, the high-speed camera was employed to record DCC phenomenon in a flat structure visualized experiment rig, in which, the steam nozzle and mixing chamber were both rectangular. The flow field of DCC were filmed when the inlet steam pressure, inlet water pressure and temperature were in the range of 0.1∼0.45MPa, 0.1∼0.4MPa, and 30∼50°C, respectively. Moreover, the temperature and pressure fields on the bottom wall center were measured at various test conditions. The results indicated that, the flow field of DCC in a restricted channel should be divided into five regions, and five different steam jet shapes were observed. The temperature and pressure distributions were mainly controlled by the inlet parameters and the temperature fluctuation of stable steam jet evidenced the existence of compression and expansion waves. Additionally, the pressure decrease was due to expansion waves and the increase was due to conversion of kinetic energy to pressure energy. The results were of theory signification for the further study and future industrial applications.