Experimental Investigation of a Submerged Air-Water Bubbly Flow Jet in a Water Tank as a Model of Steel Casting

2020 ◽  
Keyword(s):  
Experimental Investigation ◽  
Steel Casting ◽  
Bubbly Flow ◽  
Water Tank

EXPERIMENTAL INVESTIGATION OF A SUBMERGED AIR–WATER BUBBLY FLOW JET IN A WATER TANK AS A MODEL OF STEEL CASTING

2020 ◽  
Vol 61 (4) ◽  
pp. 573-582
Author(s):  
A. Khan ◽  
E. K. Spiridonov ◽  
D. F. Khabarova ◽  
K. Sanaullah ◽  
A. Badahar ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Steel Casting ◽  
Bubbly Flow ◽  
Water Tank

Optical Observation of the Supercavitation Induced by High-Speed Water Entry

2000 ◽  
Vol 122 (4) ◽  
pp. 806-810 ◽  
Author(s):  
Hong-Hui Shi ◽  
Motoyuki Itoh ◽  
Takuya Takami
Keyword(s):  
Experimental Investigation ◽  
Free Surface ◽  
Shock Waves ◽  
High Speed ◽  
Bubbly Flow ◽  
Water Entry ◽  
Gas Pressure ◽  
Optical Observation ◽  
Water Tank ◽  
Experimental Facility

When a high-speed projectile penetrates into water, a cavity is formed behind the projectile. The gas enclosed in the cavity experiences a nonequilibrium process, i.e., the gas pressure decreases as the projectile moves more deeply into water. As a result, the cavity is sealed near the free surface (surface closure) and subsequently the cavity breaks up in water (deep closure). Accompanying the break-up of the cavity, secondary shock waves appear. This is the so-called supercavitation in water entry. This paper describes an experimental investigation into the water entry phenomenon. Projectiles of 342 m/s were generated from a small-bore rifle that was fixed vertically in the experimental facility. The projectiles were fired into a windowed water tank. A shadowgraph optical observation was performed to observe the entry process of the projectile and the formation and collapse of the cavity behind the projectile. A number of interesting observations relating to the motion of the free surface, the splash, the underwater bubbly flow and so on were found. [S0098-2202(00)00204-2]

scholarly journals Experimental Investigation of the Interaction between Rising Bubbles and Swirling Water Flow

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Tomomi Uchiyama ◽  
Shunsuke Sasaki
Keyword(s):  
Experimental Investigation ◽  
Water Flow ◽  
Flow Rate ◽  
Swirling Flow ◽  
Vertical Axis ◽  
Central Axis ◽  
Bubble Flow ◽  
Air Bubbles ◽  
Water Tank ◽  
Bubble Plume

This study experimentally investigates the interaction between rising bubbles and swirling water flow imposed around the central (vertical) axis of a bubble plume in a cylindrical water tank. Small air bubbles are successively released from the bottom of the tank to generate a bubble plume, and a stirring disc at the bottom of the tank is rotated to impose a swirling water flow around the central axis of the bubble plume. The bubbles disperse further with the increasing rotational speedωof the stirring disc. Some bubbles shift toward the central axis of the swirling flow whenωis high. The nondimensional swirling velocity of water reduces with increasing bubble flow rate whenωis lower than a certain value. However, it is less affected by the bubbles whenωis higher. The precessional amplitude for the upper end of the vortex core increases due to the presence of the bubbles. With increasingω, the nondimensional precessional velocity decreases, and the bubble effect also reduces.

Experimental Investigation of the Green Water Loads on a Wave-Piercing Tumblehome Ship

2017 ◽  
Author(s):  
Hui Li ◽  
Bao-Li Deng ◽  
Shu-Zheng Sun ◽  
Wen-Lei Du ◽  
Hao-Dong Zhao
Keyword(s):  
Experimental Investigation ◽  
High Speed ◽  
Water Pressure ◽  
Pressure Sensors ◽  
Green Water ◽  
Strong Nonlinearity ◽  
Water Tank ◽  
Water Tank Experiment ◽  
The Impact ◽  
Ship Speed

This paper presents the results of an experimental investigation of green water loads on a wave-piercing tumblehome ship. A water tank experiment was carried out in head regular waves by using a self-propelling segmented ship model. Wave probes and pressure sensors were arranged on the bow deck along the longitudinal and transverse directions. The height of water and the impact pressure on the deck were measured and their distributions in different wave conditions studied. The motion of the water flowing on the deck was recorded by a high-speed video system. Based on the experimental results, it was found that the green water is more serious with the increase of incident wave height and ship speed. The bow shape has little effects on the occurrence of green water, but it influences the green water loads to some extent. The distribution of green water pressure is different from that of green water height due to the strong nonlinearity of green water pressure.

Experimental investigation of a developing two-phase bubbly flow in horizontal pipe

2014 ◽  
Vol 60 ◽  
pp. 161-179 ◽  
Author(s):  
M. Bottin ◽  
J.P. Berlandis ◽  
E. Hervieu ◽  
M. Lance ◽  
M. Marchand ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Bubbly Flow ◽  
Two Phase ◽  
Horizontal Pipe
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