scholarly journals HYDRAULIC MODEL EXPERIMENT ON THE STABILITY OF CONCRETE BLOCKS IN THE SEVERE WAVE CONDITIONS

2002 ◽  
Vol 18 ◽  
pp. 395-400
Author(s):  
Osamu HORITA ◽  
Masakatsu NAKAYAMA ◽  
Kousei UEHARA ◽  
Tetsuya HIRAISHI ◽  
Haruhiro MARUYAMA ◽  
...  
Keyword(s):  
Model Experiment ◽  
Hydraulic Model ◽  
Concrete Blocks ◽  
Wave Conditions ◽  
The Stability

scholarly journals HYDRAULIC MODEL EXPERIMENT ON WAVE OVERTOPPING OF COASTAL DIKE WITH 1:0.5 and 1:1 SLOPE at hc/Ho'=0～1

2016 ◽  
Vol 72 (2) ◽  
pp. I_379-I_384
Author(s):  
Kazuki HIMENO ◽  
Tetsuya TAKESHITA ◽  
Tatsuyuki IGARASHI ◽  
Tomoyoshi KOIZUMI ◽  
Yoshio SUWA
Keyword(s):  
Model Experiment ◽  
Hydraulic Model ◽  
Wave Overtopping

Hydraulic Model Experiment and Numerical Simulation of Bottom-Blowing Copper Smelting Furnace

2014 ◽  
Vol 602-605 ◽  
pp. 546-553 ◽  
Author(s):  
Yue Yu ◽  
Zhi Wen ◽  
Xun Liang Liu ◽  
Fu Yong Su ◽  
Hai Peng Lan ◽  
...  
Keyword(s):  
Model Experiment ◽  
Thermal Process ◽  
Pressure Fluctuations ◽  
Hydraulic Model ◽  
Copper Smelting ◽  
Smelting Furnace ◽  
Growing Up ◽  
Vof Model ◽  
Bottom Blowing ◽  
A Company

A hydraulic model is used to study the flowing process within a bottom-blowing furnace designed by a company, and the VOF model is adopted to simulate its process. The VOF method can describe the formation, growing up and separation actions in theorizing process by comparing the simulation and experimental results, and this is a foundation of using a model to research the thermal process of the bottom-blowing furnace. It is indicated that a nozzle with disperse spouts can stir a larger zone, by comparing the influence on flowing process of four nozzles with different structures. The disperse spouts are benefit to increase the stirring and reaction efficiencies, but the pressure fluctuations near the nozzle export is more obvious, and it may affect the lifespan of the nozzle.

scholarly journals VERIFICATION OF TSUNAMI INUNDATION SIMULATION BASED ON COMPARISON WITH HYDRAULIC MODEL EXPERIMENT

2013 ◽  
Vol 69 (1) ◽  
pp. 22-32
Author(s):  
Toshihiko TAKAHASHI ◽  
Takako FUKUYAMA ◽  
Yumi SHINBO ◽  
Yoshinobu AKIYAMA ◽  
Masahiro TANAKA ◽  
...  
Keyword(s):  
Model Experiment ◽  
Hydraulic Model ◽  
Tsunami Inundation ◽  
Simulation Based ◽  
Inundation Simulation

Stepped chutes lined with wedge-shaped concrete blocks: hydrodynamic pressures on blocks and stability analysis

2011 ◽  
Vol 38 (3) ◽  
pp. 338-349 ◽  
Author(s):  
António T. Relvas ◽  
António N. Pinheiro
Keyword(s):  
Cross Section ◽  
Flow Characteristics ◽  
Concrete Block ◽  
Earth Dam ◽  
Systematic Research ◽  
Drainage Layer ◽  
Uplift Pressure ◽  
Concrete Blocks ◽  
Block Stability ◽  
The Stability

The use of wedge-shaped concrete block overlays to protect embankments subject to flows with relatively high velocities is an idea dating from the late 1960s. Subsequent studies addressed the block stability and design, with or without drainage layer underneath, and the flow characteristics. One aspect still lacking systematic research is the block stability considering the influence of the drainage layer and of the uplift pressure beneath the blocks. The stability of blocks located in the training walls of a trapezoidal cross section has never been investigated, although this type of section is expected when installing a concrete block overlay over embankments. The present study addresses this aspect, using a relatively large facility where the blocks are laid on a drainage layer over an embankment artificially saturated, thus intending to simulate a concrete block spillway installed over a compacted homogeneous earth dam. Data collected both in a trapezoidal flume and in a rectangular flume are is analyzed, together with other authors’ data for this type of stepped overlay. The inherent hydrodynamic stability is verified. Experiments with hydraulic jump formation over the blocks at the end of the flume also showed block stability.

scholarly journals CAISSON WALL BREAKAGE OF SLOPING TOP BREAKWATER DUE TO COLLISION OF LARGE WAVE DISSIPATING BLOCKS

2018 ◽  
pp. 18
Author(s):  
Kojiro Suzuki ◽  
Kenichiro Shimosako ◽  
Ryota Gushi
Keyword(s):  
Wave Energy ◽  
Detailed Design ◽  
Large Wave ◽  
Failure Mechanics ◽  
Hydraulic Experiment ◽  
Wave Conditions ◽  
The Stability

A sloping top breakwater covered with wave dissipating blocks (STBWB) has been developed and placed in service under extremely large wave conditions in Japan. The U-breakwater in N-port, designed as an STBWB, and constructed using 50t Dolos (Kd number 20) has been in service since the 1980s. Recently, newly developed 100t wave dissipating blocks (Kd number 10) were used to extend the U-breakwater. The stability of the new U-breakwater blocks was certificated by hydraulic experiment of detailed design. However, breakage of caisson wall, as shown in Figure 1, was caused by the large wave energy of Typhoon 19 in 2014. To clarify the failure mechanics, we conducted a series of hydraulic experiments.

scholarly journals Bioaccessibility of Antioxidants in Blackcurrant Juice After Treatment Using Supercritical Carbon Dioxide

2021 ◽  
Author(s):  
Urszula Trych ◽  
Magdalena Buniowska ◽  
Sylwia Skąpska ◽  
Ireneusz Kapusta ◽  
Krystian Marszałek
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Vitamin C ◽  
Model Experiment ◽  
Dehydroascorbic Acid ◽  
Total Anthocyanins ◽  
The Stability ◽  
Supercritical Carbon ◽  
Thermally Treated

Blackcurrant juice (Ribes nigrum L.) was subjected to supercritical carbon dioxide (SCCD) at 10, 30 and 60 MPa for 10 min at 45°C as well as thermally treated at 45°C and 85°C for 10 min to determine the stability, antioxidant capacity (AC) and bioaccessibility (BAc) of vitamin C, total anthocyanins and their individual monomers. An in vitro gastrointestinal digestion model completed with dialysis was used to assess BAc. The use of SCCD at each of the pressures applied improved the stability of vitamin C, total anthocyanins, and AC before in vitro digestion. As a result of digestion, L-ascorbic acid was oxidized to L-dehydroascorbic acid, and finally, the total content of vitamin C, anthocyanins, and AC decreased. SCCD did not significantly improve the BAc of vitamin C and total anthocyanins. The highest BAc of vitamin C was noted in fresh juice (FJ) (40%) and after mild heat treatment at 45°C (T45) (46%). The highest BAc of total anthocyanins was also noted in the FJ (4.4%). The positive effect of the application of SCCD on the BAc of the delphinidin-3-O-glycosides was observed compared to T45 and thermal pasteurization at 85°C (T85). Moreover, cyanidins were generally more bioaccessible than delphinidins in all samples. AC after digestion was higher in SCCD samples compared to thermally treated measured using ABTS+• and DPPH• assays, whereas in dialysate similar trends were observed only for AC measured using the ABTS+• assay. This phenomenon was justified by the formation of individual metabolites detected by UPLC-PDA-MS / MS in the model experiment with delphinidin-3-O-rutinoside. The protocatechuic acid which is well known as a strong antioxidant was detected in the model experiment after digestion. Further research is needed to better understand the metabolic pathway of anthocyanins and the possible uses of SCCD to improve the health properties of fruit products.

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