The 12th International Conference on Hydrodynamics
18 – 23 september 2016, Egmond aan Zee, The Netherlands
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RESEARCH ON THE EFFECTS OF SILT MEAN DIAMETERS AND SILT CONCENTRATIONS ON THE CAVITATION FLOW IN A TWO-DIMENSIONAL NOZZLE


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Presentation:
Session: Cavitation and cavitating flows I
Room: Room 4
Session start: 14:00 Tue 20 Sep 2016

Wweiguo Zhao   zhaowg@zju.edu.cn
Affifliation: Lanzhou University of Technology

Xiangdong Han   hanromeolut@163.com
Affifliation: Lanzhou University of Technology

Rennian Li   lirn@lut.cnAffiliation
Affifliation: Lanzhou University of Technology

Ming Liu   lium0313@126.co
Affifliation: Lanzhou University of Technology


Topics: - Cavitation and cavitating flows

Abstract:

Effects of silt mean diameters and volume fractions are investigated in sediment laden cavitation flow in a two-dimensional nozzle. The silt mean diameters are 0.02mm, 0.04mm, 0.06mm, 0.07mm and 0.08mm and volume fractions are 2%, 4%, 6%, 7 % and 8%. When silt mean diameters are invariant, volume fractions are changed to take into account the effects of them and when volume fractions are the constants, silt mean diameters are varied to consider the effects of them. The results show that cavitation occurs at the beginning parts of the jet orifice and distributions of the vapor phase flow are axial symmetrical. Cavitation number variation with the volume fraction or with the silt mean diameter reflects the effect degree of silt particles towards the cavitation flow. With the silt mean diameters being 0.06mm, 0.07mm and 0.08mm, fluctuation of cavitation number with volume fraction is much larger than it with the silt mean diameters being 0.02mm and 0.04mm. During the volume fractions are fixed, all the fluctuations of cavitation number with silt mean diameters are vaster, demonstrating that silt mean diameters have an intense effect on cavitation flow. Reasons why silt particles promote the development of the cavitation are analyzed. Effect of the properties of silt particles, cavitation nucleons, pulsation of the pressure, instability of the boundary layer and virtual mass force are considered and studied.