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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

THE NUMERICAL SIMULATION OF HYDRAULIC CAVITATION IN VENTURI TUBE

Get access (open in a dialog) DOI: 10.1615/IHTC16.mpf.022001
pages 6199-6215

Sinopsis

Water pollution is the important cause of global water shortages, effective treatment and recycling of sewage is of great significance to promote the sustainable development of society and economy. Efficiency, cost of sewage treatment and degradation rate of organic pollutants are the important factors that decides the advancement and popularization of sewage treatment technology. Based on hydraulic cavitation principle, a new type of hydraulic cavitator composed of the venturi tube and the orifice was designed to improve the sewage purification efficiency, shorten the cleaning cycle and reduce the energy consumption. The single factor numerical simulation experiments were carried out on the different inlet angles, orifice position and inlet oxygen content of Venturi tubes. The rate of vapor content and pressure distribution at the corner of throat were obtained. It layes the foundation for the optimization design of hydraulic cavitator. Hydro-cavitating equipment was setup to treat the sewage with different impurities (sewage, industrial sewage, oil sewage and sewage after magnetic separation, for example). COD and SS values were used to characterize the sewage disposal effect. The disposal results of industrial sewage show that COD values of industrial sewage are gradually decreased along with the treatment times and disposal effect is up to 10.4%. The oily emulsified sewage is a kind of sewage which is difficult to be treated in oily sewage. The oil-water separation and deep degradation should be carried out first. After salting out and demulsification, the cavitation effect of sewage had been greatly improved. COD value reached 44.4% and SS value was 68%. Sewage after magnetic separation was alkaline and acid neutralization was first performed. COD value reached 20% and SS value was 73%. The experiment data show that the hydraulic cavitator has obvious effect on sewage treatment.