scholarly journals Precise Evaluation of Corrosion Environments of Structural Materials under Complex Water Flow Condition, (II)

2003 ◽  
Vol 40 (11) ◽  
pp. 941-950 ◽  
Author(s):  
Nagayoshi ICHIKAWA ◽  
Junichi TAKAGI
Keyword(s):  
Water Flow ◽  
Flow Condition ◽  
Structural Materials ◽  
Precise Evaluation

Overview of Research on the Influence of Permeable Structures

2013 ◽  
Vol 405-408 ◽  
pp. 2115-2122
Author(s):  
Qian Qian Shang ◽  
Hui Xu ◽  
Guo Bin Li
Keyword(s):  
Water Flow ◽  
Flow Condition ◽  
River Regulation ◽  
Adverse Impact ◽  
Local Flow ◽  
Flow Energy ◽  
Similarities And Differences ◽  
Protective Structures

The protective structures on the shore often used in the river regulation and channel rectification works are divided into solid structures and permeable structures. The solid structures will cause an intensive change of the local flow condition, and lead to adverse impact as scouring of local foundation and edges; the permeable structures which can dissipate the flow energy are gradually popularized for use. Common permeable structures include the tetrahedron-like penetrating frame used for engineering and vegetation on the shore, etc. This paper takes the tetrahedron-like penetrating frame and vegetation for example, summarizes research on the behavior of water flow and sediment affected by permeable structures, discusses the similarities and differences as well as different effects of the functions of the solid structures and permeable structures, and finally concludes the features of application of permeable structures.

Influences of Impeller Diameter and Diffuser Blades on Air-Water Two-Phase Flow Performance of Centrifugal Pump

2005 ◽  
Author(s):  
Naoki Matsushita ◽  
Akinori Furukawa ◽  
Kusuo Okuma ◽  
Satoshi Watanabe
Keyword(s):  
Centrifugal Pump ◽  
Water Flow ◽  
Flow Rate ◽  
Rotational Speed ◽  
Flow Condition ◽  
High Performance ◽  
Two Phase Flow ◽  
Water Flow Rate ◽  
Phase Flow ◽  
Two Phase

A tandem arrangement of double rotating cascades and single diffuser cascade, proposed as a centrifugal pump with high performance in air-water two-phase flow condition, yields lower head due to the smallness of the impeller outlet in comparison with a impeller with large outlet diameter and no diffuser. Influences of impeller diameter change and installation of diffuser blades on two-phase flow performance were experimentally investigated under the case of the same volute casing. As the result, the similarity law of the diameter of impeller having the similar blade geometry and the rotational speed is satisfied even in two-phase flow condition. Comparing pump performances between a large impeller without diffuser blades and a small one with diffuser blades, higher two-phase flow performance is obtained by controlling the rotational speed of a small impeller with diffuser blades in the range of small water flow rates, while a large impeller with no diffuser gives high performance in the range of high water flow rate and small air flow rate.

Experimental study on the bearing capacity of large-diameter monopile in sand under water flow condition

2021 ◽  
Vol 224 ◽  
pp. 108708
Author(s):  
Xinjun Zou ◽  
Xiong Cao ◽  
Changlin Zhou ◽  
Mi Zhou ◽  
Xihong Zhang
Keyword(s):  
Experimental Study ◽  
Bearing Capacity ◽  
Water Flow ◽  
Flow Condition ◽  
Large Diameter

The Effects of Water Flow Rate on Copper Corrosion

2017 ◽  
Vol 748 ◽  
pp. 235-239
Author(s):  
M.H. Mahmood ◽  
Suryanto ◽  
Muataz Hazza Faizi Al Hazza
Keyword(s):  
Corrosion Rate ◽  
Turbulent Flow ◽  
Water Flow ◽  
Flow Rate ◽  
Flow Condition ◽  
Water Flow Rate ◽  
Copper Surface ◽  
Operating Conditions ◽  
Initial Stage ◽  
Fully Developed Turbulent Flow

This study investigates the effect of water flowrate on the copper alloy corrosion by using a hydrodynamic corrosion test in operating conditions of water flow rate range between 0.05 and 3.5 m/s, the temperature range between 20 and 45 °C. Dissolved oxygen concentration was in the range between 6.1 and 9.2 mg/l. The effects of water properties density, viscosity, and the tube geometric dimensions also considered. Corrosion rate determined by the weight loss calculation method and the tested samples microstructures characterized using FESEM. The results showed that the copper surface layer more affected by water flow at the beginning of turbulent flow condition, while at fully developed turbulent flow condition the surface covered with a fixed oxide layer. Therefore, corrosion found to be at higher rates during the initial stage of the turbulent flow condition, but it reduced at fully developed turbulent flow conditions at higher water velocity. These results indicate that the overall flow rate conditions, which include physical properties of the fluid, hydrodynamic parameters, and the geometric tube dimensions, have the dominant influence on corrosion rate.

Hydromechanical Analysis of Desilting Mechanism of Ecological Arc-Shaped Baffle Fishway

2012 ◽  
Vol 511 ◽  
pp. 154-158 ◽  
Author(s):  
Jing Cong ◽  
Di Cui ◽  
Fei Yu ◽  
Jia Yuan Wang ◽  
Li Quan Xie
Keyword(s):  
Energy Dissipation ◽  
Water Flow ◽  
Fish Species ◽  
Flow Condition ◽  
Building Materials ◽  
Fish Migration ◽  
Hydromechanical Analysis ◽  
New Type ◽  
Flow Through ◽  
Upstream Flow

In this paper, we developed a new type of ecological Denil fishway installed with arc-shaped baffles which can split upstream flow to improve the flow condition for fish migration. In fact, the arc-shaped is based on architectonics theory and imitate the mechanism of architectonics.So it has good effectiveness. During the construction course, building materials can be used to improve efficiency.By setting water flow orifices near the V-shaped notch, the energy dissipation can be increased as result of the interaction between the water from the orifices and the water from the notch. The sand or other sediments accumulated on the fishway floor can be washed away by the flow through desilting orifices, meeting the requirement of purificating the fishway and providing a clear environment for fish species. Model tests were conducted to investigate the desilting capability of the ecological arc-shaped baffle fishway and the results agree well with the hydromechanical analysis.

Calculation Method of Attemperation Water Flow in Changing Steam Flow Condition

2012 ◽  
Vol 614-615 ◽  
pp. 282-285
Author(s):  
Qing Wang ◽  
Yuan Li
Keyword(s):  
Computer Simulation ◽  
Water Flow ◽  
Calculation Method ◽  
Water Demand ◽  
Flow Condition ◽  
Linear Process ◽  
Enthalpy Increment ◽  
Steam Flow ◽  
Matlab Software ◽  
Perform Computer Simulation

In order to control the attemperation water demand, the superheater heating ability is calculated by enthalpy increment. According to the changed enthalpy of the superheater outlet, the attemperation water demand is estimated. To simplify calculation, the changing steam flow is regarded as linear process during a certain time. Thus, the attemperation water calculation method is obtained. Basis on this, Matlab software is used to perform computer simulation to the system.

Effect of verapamil on cytoplasmic distribution of granules and microfilaments in amphibian urinary bladder

1988 ◽  
Vol 46 ◽  
pp. 324-325
Author(s):  
A.J. Mia ◽  
L.X. Oakford ◽  
T. Yorio
Keyword(s):  
Urinary Bladder ◽  
Water Flow ◽  
Morphological Changes ◽  
Granular Cell ◽  
Cytosolic Calcium ◽  
Calcium Storage ◽  
Amphibian Urinary Bladder ◽  
Vesicular Membrane ◽  
High Concentrations ◽  
Cytoskeletal System

The amphibian urinary bladder has been used as a ‘model’ system for studies of the mechanism of action of antidiuretic hormone (ADH) in stimulating transepithelial water flow. The increase in water permeability is accompanied by morphological changes that include the stimulation of apical microvilli, mobilization of microtubules and microfilaments and vesicular membrane fusion events . It has been shown that alterations in the cytosolic calcium concentrations can inhibit ADH transmembrane water flow and induce alterations in the epithelial cell cytomorphology, including the cytoskeletal system . Recently, the subapical granules of the granular cell in the amphibian urinary bladder have been shown to contain high concentrations of calcium, and it was suggested that these cytoplasmic constituents may act as calcium storage sites for intracellular calcium homeostasis. The present study utilizes the calcium antagonist, verapamil, to examine the effect of calcium deprivation on the cytomorphological features of epithelial cells from amphibian urinary bladder, with particular emphasis on subapical granule and microfilament distribution.

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