Experimental Investigation on Enhancive Effect of Hydrodynamic Cavitation

Based on the principle of hydraulics,an effective equipment of hydrodynamic cavitation is designed and built in this paper.The orifice plates with various geometry size were used as hydrodynamic cavitation generator to study the relation ship between many factor,such as,inlet pressure,discharge,flow speed in orifice,and the cavitation number.Analysis of water flow cavitation status for the experimental unit,this device can produce cavitation phenomenon.The methylene blue and spectrophotometer method can capture the free radicals generated successfully.This is an effective way to measuring the free radicals quantitatively in cavitation,moreover it is easy to fulfill.The intensity of cavitation increases with reduction in the cavitation number.By analyzing the influence of cavitation number on concentrations of •OH.It would be strength of hydrodynamic cavitation.The effect of operating parameters,such as inlet press,low speed in orifice and optimum the structure of hydrodynamic cavitation,best condition of the hydrodynamic cavitation is the inlet press、flow speed in orifice 14 m/s、 0.07.

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Experimental Investigation of a Two-Phase (Air-Water) Flow in a Pipe with Street Canyon Cavities

International Review of Mechanical Engineering (IREME) ◽

10.15866/ireme.v8i6.4569 ◽

2014 ◽

Vol 8 (6) ◽

pp. 1149

Author(s):

Dimitra A. Zoga ◽

Dimitrios S. Georgakis-Gavrilis ◽

Dionissios P. Margaris

Keyword(s):

Experimental Investigation ◽

Water Flow ◽

Street Canyon ◽

Two Phase

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Optimization of water flow speed in dams

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/1122/1/012031 ◽

2021 ◽

Vol 1122 (1) ◽

pp. 012031

Author(s):

Lusiana Tarihoran ◽

Tulus ◽

Sawalluddin

Keyword(s):

Water Flow ◽

Flow Speed

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Assessment of Tandem Venturi on Enhancement of Cavitational Chemical Reaction

Journal of Fluids Engineering ◽

10.1115/1.3026731 ◽

2008 ◽

Vol 131 (1) ◽

Cited By ~ 5

Author(s):

Hoseyn Sayyaadi

Keyword(s):

Chemical Reaction ◽

Oxidation Process ◽

Flow Characteristics ◽

Chemical Oxidation ◽

Cavitation Number ◽

Cavitating Flow ◽

Hydrodynamic Cavitation ◽

Operating Pressure ◽

Local Pressures ◽

Second Category

The collapsing phenomenon of cavitation bubbles generates extremely high local pressures and temperatures that can be utilized for the chemical oxidation process. This process is carried out in cavitation reactors. A Venturi tube is one of the most common forms of hydrodynamic cavitation reactors, which is suitable for industrial scale applications. In this work, the hydraulic performance and efficiency in chemical reaction of a new form of hydrodynamic cavitation reactors, which is called “tandem Venturi,” were studied and compared with the conventional type of the single Venturi. The tandem Venturi is used for enhancement of the chemical reaction of hydrodynamic cavitating flow. The reaction enhancement is useful especially for the reaction of aqueous solutions not containing volatile organic compounds (VOCs). The operating pressure, inlet pressure, flow rate, and consequently the cavitation number were controlled and systematically varied for both single and tandem Venturis. Moreover, a specified amount of H2O2 was injected into the flow as required. The effects of operating pressure and the cavitation number on cavitating flow characteristics for single and tandem Venturis were experimentally observed and the results were compared. In addition, the performance of the tandem-Venturi reactor for degradation of non-VOC contaminants (2-chlorophenol) was studied. Its performance was compared with the performance of a conventional Venturi reactor. Two different categories were conducted for the experiments. In the first category, the effect of the net cavitating flow on degradation of non-VOC for the single and tandem Venturis was compared. In the second category, the effect of H2O2 injection into the cavitating flow on degradation of non-VOC (“cavitation-oxidation” process) was studied. The performance of the single and tandem Venturis for the cavitation-oxidation process was compared. Further investigation was performed to assess the advantage of utilizing the tandem Venturi from the viewpoint of efficiency of the oxidation process. The results of the energy efficiency were compared with the corresponding efficiency of the single Venturi. Finally, the relationship between the main parameters of cavitation reaction flow with the chemical performance was discussed.

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Experimental investigation of natural gas hydrate production characteristics via novel combination modes of depressurization with water flow erosion

Fuel ◽

10.1016/j.fuel.2019.04.120 ◽

2019 ◽

Vol 252 ◽

pp. 295-303 ◽

Cited By ~ 11

Author(s):

Bingbing Chen ◽

Huiru Sun ◽

Kehan Li ◽

Dayong Wang ◽

Mingjun Yang

Keyword(s):

Experimental Investigation ◽

Natural Gas ◽

Water Flow ◽

Gas Hydrate ◽

Natural Gas Hydrate ◽

Combination Modes ◽

Production Characteristics

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Experimental investigation of the thermal and disinfection performances of a novel hydrodynamic cavitation reactor

Ultrasonics Sonochemistry ◽

10.1016/j.ultsonch.2018.02.039 ◽

2018 ◽

Vol 49 ◽

pp. 13-23 ◽

Cited By ~ 24

Author(s):

Xun Sun ◽

Jong Jin Park ◽

Hyun Soo Kim ◽

Seung Ho Lee ◽

Si Jin Seong ◽

...

Keyword(s):

Experimental Investigation ◽

Hydrodynamic Cavitation

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Experimental Investigation of Water Flow through Vesicular Fractures in Volcanic Rock

International Journal of Geomechanics ◽

10.1061/(asce)gm.1943-5622.0001815 ◽

2020 ◽

Vol 20 (10) ◽

pp. 04020170

Author(s):

Xiaoming Liu ◽

Benliang Yang ◽

Lin-Shuang Zhao ◽

Wan-Huan Zhou

Keyword(s):

Experimental Investigation ◽

Volcanic Rock ◽

Water Flow ◽

Flow Through

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The experimental investigation on single cylinder compression ignition engine fuelled by neem biodiesel with varying injection and operating parameters to ensure engine performance and emission by response surface methodology

10.1063/1.5123923 ◽

2019 ◽

Author(s):

Hardik B. Ramani ◽

Mohammad Israr

Keyword(s):

Experimental Investigation ◽

Response Surface Methodology ◽

Response Surface ◽

Engine Performance ◽

Operating Parameters ◽

Compression Ignition ◽

Compression Ignition Engine ◽

Single Cylinder ◽

Performance And Emission ◽

Cylinder Compression

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Experimental Investigation on Pouring Aggregate to Plug Horizontal Tunnel with Flow Water

Water ◽

10.3390/w12061763 ◽

2020 ◽

Vol 12 (6) ◽

pp. 1763 ◽

Cited By ~ 1

Author(s):

Gailing Zhang ◽

Shuang Hui ◽

Weixin Li ◽

Wanghua Sui

Keyword(s):

Experimental Investigation ◽

Critical Velocity ◽

Water Flow ◽

Gravitational Force ◽

Coarse Aggregate ◽

Solid Particles ◽

Fine Aggregate ◽

Mass Ratio ◽

Range Analysis ◽

Tunnel Model

This paper presents an experimental investigation on the main factors that influence the effects of pouring aggregate to plug a tunnel that has been inundated by groundwater to reduce the flow velocity. Moreover, a criterion for plugging the tunnel under infiltrating water to resist flow is proposed. A range analysis and analysis of variance both show that the influencing factors on the efficiency of plugging in descending order is the aggregate particle size, followed by initial velocity of the water flow, and then the water–solid mass ratio. The sedimentation process of the aggregate is likened to the deposition of solid particles into slurry in which the particles settle under gravitational force, thus accumulating at the bottom of the tunnel model due to the forces of the water flow and gravity. The critical velocity of the water that will transport the aggregate without settling can be used as a criterion to determine whether there has been a successful plug of the resistance to flow in the tunnel. The experimental results show that the critical velocity of fine aggregate is less than that of coarse aggregate, and the section with smaller sized aggregate or fine aggregate that resists water flow is flatter. In addition, the required minimum space between two pouring boreholes for a successful resistance to flow is discussed.

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