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Bubble characteristics of air–water bubbly jets in

01/10/2013· In a bubble plume, the shape is close to an ellipse, Meanwhile, u b may also decrease because of the production of smaller bubbles (bubble breakup) by the stronger water jet, e.g., the maximum value of u b at Section 20d decreases from 0.74 m/s in Expt. 3–0 to 0.69 m/s in Expt. 3–1 and further to 0.64 m/s in Expt. 3–3. With the increase in Q a, u b increases because of the increase

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Water Fountain Bubble Shape Water Jet Buy Water

Water Fountain Bubble Shape Water Jet,Find Complete Details about Water Fountain Bubble Shape Water Jet,Water Jet,Mini Water Jet,Bubble Shape Water Jet from Stone Garden Products Supplier or Manufacturer-Hangzhou Jetline Fountain Co., Ltd.

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An effective method for modeling the load of bubble jet in

2 天前· Due to the nonlinear effects such as strong impact and complex movement of gas-water interface in the process of water jet in underwater explosion, th

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Two-Phase PIV-LIF Measurements in a Submerged Bubbly

Two-Phase PIV-LIF Measurements in a Submerged Bubbly Water Jet backed up by less variation of the air bubbles’ shape and orientation passing from the jet zone to the zone above the same. The results of this study have led to better knowledge of bubble–water and bubble–bubble interactions and to an estimation of the effects of air bubbles in the shear layer of a bubbly water jet

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Depth of penetration of bubbles entrained by an oscillated

01/05/2019· Cartography predicting shape of bubble cloud as a function of two dimensionless numbers. Abstract. We present experimental measurements of the penetration depth of the bubble cloud generated by a plunging water jet, when this jet is oscillated parallel to the free surface. We demonstrate that when the Reynolds number is larger than 10 4 the penetration depth can be adequately described

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Bubble characteristics of air–water bubbly jets in

Bubble characteristics are systematically measured in air–water bubbly jets in crossflow. At a cross-section, the gas-phase exhibits an ellipse-shape for pure air injection, while a kidney-shape for a mixture of air–water injection. Bubble properties along the gas-phase centerlines were also investigated, and their values decay along the centerlines until reaching some terminal values

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Numerical analysis of cavitation cloud shedding in a

01/12/2016· Key words: cavitation, bubble dynamics, submerged water jet, two-phase flow, turbulent flow Introduction High-speed water jet injected into still water, which is called submerged water jet, has received much attention for its capacity of generating very high cavitation impact pressure in the collapse of cavitation bubbles and widely applied to such as peening of metal materials, decomposition

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Shape Bubbles Water, Shape Bubbles Water Suppliers and

Alibaba offers 4,245 shape bubbles water products. About 11% of these are bubble toys, 1% are water treatment, and 1% are water play equipment. A wide variety of shape bubbles water options are available to you, such as bubble water, bubble set.

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MOTION OF BUBBLES AND BUBBLE CHARACTERSTICS

Bubble shape varies with the diameter and this is caused by the varying drag forces. Radius < 0.01 cm solid spheres Radius 0.01 to 0.1 cm deviational from spherical Radius > 0.1 cm ellipsoidal 1.3 Motion and Velocity of Bubbles The regime of bubble motion varies considerably with the Reynolds number, Re = Ua γ (3) where U = bubble rise velocity a = bubble radius γ = kinematic viscosity of

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Edible Water Bubbles That Might Soon Replace Plastic

The team behind this brilliant idea of bubble water is called Skipping Rocks Lab, a bunch of engineering graduates from RCA and Imperial College London who first introduced their ground-breaking concept in 2013. Since then they’ve been working hard to make their dream of edible water balls a reality, and a crowdfunding page they recently set up has already raised over 600k GBP (750k USD) in

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Prevention of tissue damage by water jet during cavitation

duced during the collapse of a bubble only in the presence of an obstacle ~e.g., such as a tissue surface or an endoprobe!, we hypothesize that the flow might be reduced by altering the shape of the probe. We demonstrate that the water jet can indeed be reduced, and even completely eliminated by opti-mizing the shape of the endoprobe. This

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Pulsation behavior of a bubble generated by a deep

12/02/2019· Such bubble pulsations may take place dozens of times under suitable conditions, and if the bubble is near a rigid wall or shell they can even result in a high-speed water jet. The energy in the bubble accounts for around 40% of the total energy of the explosive, therefore studying the bubble pulsation behavior is helpful for exploring the energy released by the explosive.

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Two-Phase PIV-LIF Measurements in a Submerged Bubbly

Two-Phase PIV-LIF Measurements in a Submerged Bubbly Water Jet backed up by less variation of the air bubbles’ shape and orientation passing from the jet zone to the zone above the same. The results of this study have led to better knowledge of bubble–water and bubble–bubble interactions and to an estimation of the effects of air bubbles in the shear layer of a bubbly water jet

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A New Measurement Based on HPB to Measure the Wall

At t = 6.208 ms, it means that the bubble begins to expand in the second cycle and an obvious upward water jet can be seen. At t = 6.791 ms, with the bubble expansion, the upper part of the bubble expands in a spherical shape and gradually connects to the hemispheric target. Similar to the oval bubble, at this time, a small bulge at the bottom

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Experimental study of vortex breakdown in swirling jets

bubble are axisymmetric. The cone is observed to undergo slow oscillations induced by secondary recirculating motions that are independent of con nement e ects. 1. Introduction The objective of the present experimental study is to characterize the vortex breakdown phenomenon that may arise in a swirling water jet discharging into a large tank

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Bubble size distribution resulting from the breakup of an

We investigated experimentally the shape of the finalsize PDF(D) resulting from the breakup of an air bubble injected into the fully developed region of a high Reynolds number turbulent water jet. It is shown that the PDF(Dˆ) of the normalized bubble size Dˆ5D/D 32, where D32 is the Sauter

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Developing Air-Water Shear Layers of Two-Dimensional Water

between the water jet and the surrounding air is negligible for x/do < 20. An analogy with self-aerated open channel flows is further developed. The distributions of air bubble frequency have the same shape for both flow situations suggesting some similarity in the air-water flow structure. Keywords : water jets, air entrainment, developing flow, experimental measurements, analogy with self

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Surface Modification of Cr-Mo Steel Using New Water Jet

Water jet cavitation, Multifunction cavitation, Cr-Mo steel, Surface reforming, Surface potential measurement . Introduction. Low-alloy steels with improved corrosion resistance can be obtained by alloying carbon steel with various elements at concentrations of several mass% or less (or even less than 1 mass% when combinations of elements are employed). These materials are slightly more

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The moment of air bubbles in water by use of high speed

Download Citation The moment of air bubbles in water by use of high speed photography Air bubbles play important roles in lots of processes. Studying of bubbles in ship wakes makes it feasible

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Surface Modification of Cr-Mo Steel Using New Water Jet

water jet. In the present study, ultrasonication was performed at 225 W and 28 kHz. The processing times required for MFC is 2 and 10 min, respectively, while only 2 min is required in the case of UC and WJC. Figure 1. Equipment employed for surface machining by water jet cavitation in

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A New Measurement Based on HPB to Measure the Wall

This type of bubble will induce a water jet act onto the hemisphere target in the collapse stage of the first cycle. At this time, two peak pressures are measured by Hopkinson bar, which are bubble collapse load P c−1 and water jet load P j−1 in the first cycle. In the expansion stage of the second cycle, the bubble expands in the shape of hemispherical shape, and the bubble partially surrounds the hemispheric

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Effects of Salinity on Bubble Cloud Characteristics

Bubble clouds were generated with a water jet. Salinity, surface tension, and water temperature were monitored. Measured bubble cloud parameters include the number of bubbles, the void fraction, the penetration depth, and the cloud shape. The number of large (above 0.5 mm diameter) bubbles within a cloud increases by a factor of three from fresh to saline water of 20 psu (practical salinity

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Developing Air-Water Shear Layers of Two-Dimensional Water

For a free-falling jet (experiment No. 3), it yields : V = Vo * 1 + 2*g*x Vo 2 for C < 0.90 and x/do < 17 (3) where do is the jet nozzle thickness and g is the gravity acceleration. The variation of air bubble frequency gives some information on the air-water flow structure.

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Exploring morphological variations of a laser-induced

seen in the fourth row of figure3, the crown-shaped water jet is closing and forms an air bubble to surround the prior thin jet. The closing motion of the crown-shaped water jet is analogous to the process of a flower closing its petals. The contraction of the crown-shaped liquid jet arises from

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MOBILITY OF AIR BUBBLE ENTRAPPED THROUGH JET

A single jet (with Re=4000) and a single bubble are used here. The jet is placed again along the center of the axis of the tank but the bubble is placed with an eccentricity of 3 mm from the axis (horizontal distance of 3 mm from the axis) and 10 mm vertical distance from the free surface of water.

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Bubble size distribution resulting from the breakup of an

We investigated experimentally the shape of the finalsize PDF(D) resulting from the breakup of an air bubble injected into the fully developed region of a high Reynolds number turbulent water jet. It is shown that the PDF(Dˆ) of the normalized bubble size Dˆ5D/D 32, where D32 is the Sauter

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The moment of air bubbles in water by use of high speed

Download Citation The moment of air bubbles in water by use of high speed photography Air bubbles play important roles in lots of processes. Studying of bubbles in ship wakes makes it feasible

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Periodic Behavior of Cavitation Cloud Shedding in

Among them, high-speed water jet injected into still water is called submerged water jet and it has received much attention for its capacity of causing intensive cavitation impact continually with collapsing of cavitation bubbles [4] [5] . For its particular property submerged water jet has been widely applied in various industry fields such as cleaning of complex mechanical products [6],peening of metal

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Statistical description of the bubble cloud resulting from

The final bubble size distribution, resulting from the break-up of an air jet injected into the central axis of a fully developed, high Reynolds number turbulent water jet has been measured using a Phase Doppler Particle Analyzer (PDPA). The shape of the final size distribution is shown to depend not only on the

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Surface Modification of Cr-Mo Steel Using New Water Jet

water jet. In the present study, ultrasonication was performed at 225 W and 28 kHz. The processing times required for MFC is 2 and 10 min, respectively, while only 2 min is required in the case of UC and WJC. Figure 1. Equipment employed for surface machining by water jet cavitation in

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Experimental and numerical investigation of the dynamics

Their numerical results of the bubble shape as it evolved matched well with the experiments, which suggests that BEM can be a valid approach to capturing the complex features of bubble dynamics including the formation of a water jet. Blake & Gibson (1987) studied cavitation bubbles near solid boundaries. They introduced a criterion to calculate the time-step size for bubble dynamics problems

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35.New water jet cavitation technology to increase

One water jet bubble in the swirling nozzle expands in the process of generating new bubbles by repeating generation, growth, and collapse. In the bubble growth stage, the lower pressure in the SFN gives more cavitation bubbles the opportunity to expand. Figure 3 shows the pressure and bubble radius of the process of bubble growth when the bubble radius is 10 µm, 100 µm, 150 µm, and 200 µm

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Underwater Explosion 1 Introduction

the influence of gravity and inertia will cause a high-speed water jet to develop. The jet traverses the bubble and impacts on the other side of the bubble surface. This jet can be directed towards the structure and is then associated with a third damaging mechanism. Underwater explosion (Part I) ©2008 Henry Tan 8 Rebound cycle After jet impact, the bubble will become toroidal in shape and

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Effects of Salinity on Bubble Cloud Characteristics

bubble clouds in varying saline solutions. Bubble clouds were generated with a water jet. Salinity, surface tension, and water temperature were monitored. Measured bubble cloud parameters include the number of bubbles, the void fraction, the penetration depth, and the cloud shape. The number

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The Characteristics of Self-Resonating Jet Issuing from

bubble number density waterjets occupy a special position in machining thermal-sensitive materials (Hu et al. 2014). With the development of the modern industry, higher requirements for waterjet technology were put forward. As a result, new types of water jets have emerged in succession, such as cavitating waterjet (Soyama, 2013), abrasive waterjet (Ishfaq et al. 2018), and self-resonating

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A SINGLE AIR BUBBLE RISE IN WATER: A CFD STUDY

The bubble rise in NF, the bubble terminal velocity increases with decreasing Morton number, and bubble moves up in a zigzag way with shape oscillation for the case of low Morton number of the NF

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Surface Modification of Cr-Mo Steel Using New Water Jet

Water jet cavitation, Multifunction cavitation, Cr-Mo steel, Surface reforming, Surface potential measurement . Introduction. Low-alloy steels with improved corrosion resistance can be obtained by alloying carbon steel with various elements at concentrations of several mass% or less (or even less than 1 mass% when combinations of elements are employed). These materials are slightly more

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PAP-1044 Noise Generation by Air Bubbles in Water: An

Bubble shape as a function of time . 10 . Peak sound pressure as a function of bubble . 11 . size . Definition sketch of bubble closure model 14 parameters Comparison of peak sound pressures generated 16 . by three different methods . Effect of a change in local surface tension 18 on the peak sound pressure of creation Schematic of the experimental facility 22 Radial variation of the axial

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Cavitation Visualizes the Flow Structure in the Tip Region

The axial waterjet pump consists of a seven blades rotor and an eleven blades stator, as shown in Figures 2-4. The hub of the rotor and stator has an ellipsoidal shape. The rotor tip diameter is 304.3 mm, with the tip gap 0.7 mm. Starting from the beginning of the

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University of Wollongong Research Online

the bubble away from the wall will concave inward thus forming a thin water jet (micro-jet) penetrating the cavity. In acute situations, the micro-jet will pass through the cavity and strike at the interface on the other side of the cavity. Thus the situation of a water jet impinging on a free surface has occurred. The phenomenon of the impact was first

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