scholarly journals Influence of Submerged Entry Nozzle Port Blockage on the Meniscus Fluctuation Considering Various Operational Parameters

Metals ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 269 ◽  
Author(s):  
Manish Kumar ◽  
Praveen Mishra ◽  
Apurba Kumar Roy
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Wave Amplitude ◽  
Water Flow Rate ◽  
Submerged Entry Nozzle ◽  
Casting Process ◽  
Water Model ◽  
Maximum Height ◽  
Operational Parameters ◽  
The Right

The continuous casting process (CCP) is the most vital part of steelmaking. The flow pattern near the submerged entry nozzle (SEN) and mould greatly influence the quality of the slab produced. The present investigation was carried out to gain knowledge regarding the meniscus fluctuation under different nozzle port blockage conditions by water model experiments. The experiments were carried out to study the effect of no blockage, 25% blockage, 50% blockage, and 75% blockage of the nozzle port on mould-level fluctuations. The result shows that when the liquid flow rate increases, the wave amplitude increases. In these experiments, the average and maximum meniscus fluctuations were measured while changing different variables such as the water flow rate, gas flow rate, and one-side percentage blockage of the SEN port while the other side was fully open. The observation shows that when the port size decreases, the fluid steel mixed from the obstructing side to the open side results in asymmetry. The average and maximum wave amplitude increases with decreasing submergence depth. It was observed that the maximum height of the standing waves in the mould continued rising on the non-blocked side of the SEN. Blockage increases from 25% to 75%, and with 75% blockage of the right side of the SEN port, the mould-level fluctuation at the left side of the mould was extreme, while that of the right side was relatively quiet.

Effect of Bottom Structure of Submerged Entry Nozzle on Flow Field in Ultra-Thick Slab Continuous Casting Mold

2010 ◽  
Vol 154-155 ◽  
pp. 840-845 ◽  
Author(s):  
Xin Xie ◽  
Deng Fu Chen ◽  
Qiang Liu ◽  
Jia Long Shen ◽  
Zheng Peng ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Flow Pattern ◽  
Submerged Entry Nozzle ◽  
Casting Process ◽  
Surface Flow ◽  
Water Model ◽  
Continuous Casting Mold ◽  
Flat Bottom ◽  
Thick Slab ◽  
Flow Intensity

Submerged entry nozzle (SEN) bottom structure plays an important role in determining the flow pattern in continuous casting process. This work applies a water model to evaluate the pointed-bottom, flat-bottom and recessed-bottom nozzle performance in ultra-thick slab mold. The jet properties and surface flow are compared for the three kinds of nozzles quantitatively. The results show that flat-bottom and recessed-bottom nozzles are similar in flow pattern, but the pointed-bottom nozzle has smaller jet angle, thinner flow pattern, larger surface asymmetry rate, and higher surface flow intensity.

scholarly journals Evaluation of Critical Gas Flow Rate for the Entrapment of Slag Using a Water Model.

1994 ◽  
Vol 34 (2) ◽  
pp. 164-170 ◽  
Author(s):  
Manabu Iguchi ◽  
Yutaka Sumida ◽  
Ryusuke Okada ◽  
Zen-ichiro Morita
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Water Model ◽  
Gas Flow Rate

Effects of a flotation vest and water flow rate on limb kinematics of Siberian Huskies swimming against a current

2021 ◽  
pp. 1-8
Author(s):  
Corey J. Fisher ◽  
Karen C. Scott ◽  
Hayley K. Reiter ◽  
Melissa A. Reid ◽  
Charles M. Roe ◽  
...  
Keyword(s):  
Water Flow ◽  
Flow Rate ◽  
Repeated Measures ◽  
Motion Tracking ◽  
Healthy Adult ◽  
Water Flow Rate ◽  
Experimental Conditions ◽  
Limb Kinematics ◽  
The Right ◽  
A Current

Abstract OBJECTIVE To evaluate the effects of a flotation vest (FV) and water flow rate (WFR) on limb kinematics of dogs swimming against a current. ANIMALS 7 (1 male and 6 female) healthy adult Siberian Huskies. PROCEDURES Dogs were habituated to swim with and without an FV beside an investigator in a continuous-flow pool against WFRs up to 2.9 km/h. During each of 4 experimental sessions in a repeated-measures study, markers were wrapped around the right carpus and tarsus, and a video was recorded while each dog swam with or without an FV for about 2 minutes at each of 7 WFRs between 0 and 2.9 km/h when the WFR was incrementally decreased or increased. Motion tracking software was used to measure stroke excursion and frequency. RESULTS Stroke excursion varied more than frequency among all dogs and in response to changes in experimental conditions. The male dog and 1 female dog were unable to complete the study. For the remaining 5 dogs across all experimental conditions, mean tarsus excursion was 30% that of the carpus. Mean total excursion (sum of the excursion-frequency products for the carpus and tarsus) decreased when an FV was worn and increased with WFR by 69% and 19% when WFR was incrementally increased and decreased, respectively. CONCLUSIONS AND CLINICAL RELEVANCE In dogs, range of motion during swimming was greater for the carpus than tarsus, when an FV was not worn, and increased more with WFR when WFR was incrementally increased. Those factors should be considered during swimming-based rehabilitation.

scholarly journals Characterization of the Mixing Flow Structure of Molten Steel in a Single Snorkel Vacuum Refining Furnace

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 400 ◽  
Author(s):  
Fengsheng Qi ◽  
Jinxin Liu ◽  
Zhongqiu Liu ◽  
Sherman Cheung ◽  
Baokuan Li
Keyword(s):  
Free Surface ◽  
Flow Rate ◽  
Gas Flow ◽  
Structural Parameters ◽  
Three Dimensional ◽  
Steel Production ◽  
Experimental System ◽  
Water Model ◽  
Vacuum Refining ◽  
Refining Efficiency

With the demand of high-quality steel and miniaturization of the special steel production, single snorkel vacuum refining process has been widely concerned in China recently, because of its simple structure and good performance of degassing and decarburization. In this study, a water model experimental system and a three-dimensional mathematical model based on two-fluid multiphase flow model have been built to analyze the refining efficiency limitation of the single snorkel vacuum refining furnace from the flow pattern and gas distribution. The results showed that there is a limited gas flow rate, and beyond this flow rate the gas column deviates to the wall and the redundant bubbles escape from the free surface, which will not further improve the refining efficiency and will lead to the erosion of the snorkel. In this case, the limited flow rate is 900 NL/h. Furthermore, the fluctuation of the free surface and the different structural parameters have significant effects on the flow field in single-snorkel vacuum refining furnace (SSF).

scholarly journals Particle deposition characteristics in entrained flow coal gasifier

2012 ◽  
Vol 16 (5) ◽  
pp. 1544-1548
Author(s):  
Sheng Liu ◽  
Ying-Li Hao
Keyword(s):  
Numerical Simulation ◽  
Flow Rate ◽  
Particle Deposition ◽  
Gas Flow ◽  
Water Flow Rate ◽  
Deposition Process ◽  
The Other ◽  
Central Channel ◽  
Gas Flow Rate ◽  
Coal Gasifier

Cold state experiment and numerical simulation are carried out to study particle deposition process. The deposit mass can be divided into two parts, one directly collides with the wall and the other is brought by the backflow. The deposit flux increases with the increase of gas flow rate or water flow rate or both, and decreases with the increase of the central channel gas flow rate.

scholarly journals Experimental Study for Biogas Upgrading by Water Scrubbing under Low Pressure

2015 ◽  
Vol 9 (1) ◽  
pp. 34-38 ◽  
Author(s):  
Li Huang ◽  
Chunyao Qing ◽  
Hongge Tao ◽  
YanJin Wang ◽  
Xinping Liu
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Volume Fraction ◽  
Removal Rate ◽  
Rural China ◽  
Water Flow Rate ◽  
Normal Pressure ◽  
Low Pressure ◽  
Flow Rate Ratio ◽  
Biogas Upgrading

Biogas fuels is effective to alleviate the problem of energy shortage and ecological environment for sustainable developing in rural China. But CO2 and other impurity in biogas will impede its use for generating high quality energy. In this paper, water scrubbing technology has been used for biogas upgrading under low scrubbing pressure, and the influence of CO2 removal rate and CO2 solubility caused by different experimental parameters including the feed gas flow rate, water flow rate and scrubbing pressure were examined, and the experiments dates were analyzed by SPSS17.0, and then the corresponding mathematical models were established. The result showed that, under the three scrubbing pressure level(with normal pressure, 0. 15 Mpa and 0. 3 Mpa), the improve rate of CH volume fraction increased about 15%, and CO2 volume fraction declined about 20% when scrubbing pressure raised in each level, and under 0.3 Mpa of pressure, with 0.28 of flow rate ratio of gas and liquid, CO2 removal rate gotten as high as 73.14%.So the method of water scrubbing under low pressure could be used for biogas preliminary upgrading processing when there is rich of water.

Effect of pressure and salinity on the performance of a gas-liquid separator—a preliminary study

2011 ◽  
Vol 51 (1) ◽  
pp. 603 ◽  
Author(s):  
Shakil Ahmed ◽  
Gerardo Sanchez-Soto ◽  
Chong Wong ◽  
Edson Nakagawa ◽  
Jamal Naser
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Water Flow Rate ◽  
Water Mixture ◽  
Gas Flow Rate ◽  
Cfd Modelling ◽  
Effect Of Pressure ◽  
Compact Design ◽  
Operational Range ◽  
Liquid Separator

The separation of liquid from gas during the initial stages of the separation process is very important in increasing well productivity. This is why the design of an efficient and compact gas-liquid separator has received much attention from academic researchers as well as field operators. They all state the necessity of compact design in deploying separators offshore (and potentially subsea) to enhance the recovery of gas wells. This investigation describes an experimental and computational fluid dynamics (CFD) modelling of a laboratory-scale compact gas-liquid separator designed by CSIRO. The separator consists of two concentric pipes with a swirl tube in the annular space between the pipes. The gas-liquid mixture comes from the tangential side inlet, and the system works with a combination of gravity and centrifugal forces to achieve a highly efficient gas-liquid separation. The effect of pressure and salinity on the performance of the gas-liquid CSIRO’s separation technology (CS-T) separator is investigated in this paper. The performance of the separator is visually established by observing the liquid carry over (LCO) regime in which liquid is carried out in the gas stream. The liquid and gas-flow rate at which the LCO is observed defines the upper operational range of the separator. Air-water mixture is used for both experimental and CFD investigations. The performance is evaluated at 1, 2, 5, 10 and 12 barg pressure. The upper operational range decreases with increases in pressure. For higher pressure (10 and 12 barg), the LCO curve was nearly vertical, which indicates no change in gas-flow rate with the increase in water flow rate. Salinity does not affect the performance of the CS-T separator. The CFD results are used to visualise the continuous LCO and to understand the physics and mechanism of LCO.

scholarly journals Analysis of Different Mould Section Sizes to Optimize the Submerged Entry Nozzle to Measure the Meniscus Fluctuation in a Continuous Casting Mould

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 564
Author(s):  
Manish Kumar ◽  
Praveen Mishra ◽  
Apurba Kumar Roy
Keyword(s):  
Flow Pattern ◽  
Wave Amplitude ◽  
Water Flow Rate ◽  
Submerged Entry Nozzle ◽  
Background Information ◽  
Operating Parameters ◽  
Flow Rates ◽  
Scale Models ◽  
Scale Down ◽  
Continuous Casting Mould

An experimental investigation has been carried out to analyse different mould section sizes to measure the meniscus fluctuation by varying different liquid flow rates and different submerged entry nozzle port angles, i.e., 0° port angles, 15° downward and 15° upward port angles. The terms of maximum surface wave fluctuation and standard deviation have been analysed for the above mentioned parameters. It was observed that a submerged entry nozzle with 0° port was found to be superior when it was compared with a 15° downward and 15° upward port nozzle. By conducting an experiment, it was observed that as the water flow rate increased, the maximum wave amplitude was found to be increasing, which results in more turbulence. Different mould section sizes were analysed to provide background information to the steelmaker to analyse the behaviour of fluid flow pattern. The operating parameters of the result obtained from the present setup were compared with the published literature, and a scale down of slab moulds can be justifiedregarding the rough flow pattern in the mould but can lack accuracy. The reason behind this statement is that the integral length scales of the turbulent flow between scaled down and full scale models can be different. Therefore, details of the flow pattern can become great differences between both types of models.

scholarly journals Hydraulic studies of the throughput of the water intake structure of the Tuyamuyun hydroelectric complex

2021 ◽  
Vol 264 ◽  
pp. 03059
Author(s):  
Ulmas Khusankhodjaev ◽  
Odil Kadyrov
Keyword(s):  
Water Intake ◽  
Flow Rate ◽  
Mutual Influence ◽  
Water Flow Rate ◽  
Experimental Studies ◽  
Total Consumption ◽  
Hydraulic Regime ◽  
Upper Pool ◽  
The Right ◽  
Intake Structure

The article presents the results of experimental studies to determine the throughput of the right-bank water intake structure and bottom galleries, the hydraulic regime in the galleries, and the movement of bottom sediments in them. Based on the results of the studies, a series of curves were obtained for the dependence of the discharge on the water horizon in the upper pool and the value of the opening of the gate of the intake structure. Checking the work of the galleries together with the working water intake holes showed that there is no mutual influence of them on each other. The total consumption of water passed through the water intake and galleries is practically equal to the sum of the consumption of water passed through these structures separately. It was found that the main amount of sediment accumulated in the headwater will fall into the left gallery, while slightly less (about one third) will fall into the right span, and only a small remainder leaves through the weir, while the water flow rate was distributed as follows: Qgal = 1.65Qwater.

Sign in / Sign up

Export Citation Format

Share Document