Experimental investigation of hydrodynamic damping during bending oscillations of blade profiles in water flow

1976 ◽  
Vol 8 (1) ◽  
pp. 25-27 ◽  
Author(s):  
A. A. Kaminer ◽  
B. M. Kavitskii
Keyword(s):  
Experimental Investigation ◽  
Water Flow ◽  
Hydrodynamic Damping

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

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

Experimental Investigation of Water Flow through Vesicular Fractures in Volcanic Rock

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

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

Water ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1763 ◽  
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.

An experimental investigation of heat transfer in a spiral-coil tube with pulsating turbulent water flow

2015 ◽  
Vol 52 (9) ◽  
pp. 1779-1789 ◽  
Author(s):  
H. Ramezani Kharvani ◽  
F. Ilami Doshmanziari ◽  
A. E. Zohir ◽  
D. Jalali-Vahid
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Water Flow ◽  
Spiral Coil ◽  
Turbulent Water

STUDIES ON THE RESPIRATORY MECHANISM IN SKATES

1931 ◽  
Vol 6 (1) ◽  
pp. 315-339 ◽  
Author(s):  
B. P. BABKIN ◽  
R. H. M'GONIGLE
Keyword(s):  
Central Nervous System ◽  
Experimental Investigation ◽  
Water Flow ◽  
Sea Water ◽  
Circulatory Arrest ◽  
Respiratory Control ◽  
Reflex Mechanism ◽  
Branchial Arches ◽  
The Central Nervous System ◽  
Respiratory Mechanism

Spinal skates (Raja spp.), or specimens under Dial, Ciba (0.4 cc. per kg.), were employed. When such means of circulatory arrest were used as exsanguination, ligation of the conus arteriosus, and large doses of pilocarpin (8 mg. per kg.), respiration continued for about forty-two minutes after the blood-flow had ceased. Experimental investigation of the effect of water-flow indicated it to be a primary factor in respiratory regulation as the movements disappeared when water-flow was stopped (they were diminished very much by too great water-flow). Special movements, "gasping", would then appear. Normal rhythm returned as soon as water-flow was resumed. This picture was profoundly altered by perfusion of cocaine solution (0.25% in sea-water) through the mouth and gills. If the water-flow be stopped for a longer period, in about five minutes would appear regular, though infrequent, and often weaker contractions of the branchial arches. The period of time during which these contractions would continue would depend upon the state of excitability of the respiratory centres. Certain experiments carried out on the central nervous system tend to confirm the idea of a segmental arrangement of the respiratory centres. A double mechanism for respiratory control is indicated; a weakly developed automaticity of the centres, and a finely elaborated reflex mechanism, the reaction of which varies with the stimuli received.

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.

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