Centrifuge modelling of heat-generating waste disposal

1989 ◽  
Vol 26 (4) ◽  
pp. 640-652 ◽  
Author(s):  
F. Poorooshasb ◽  
R. G. James
Keyword(s):  
Waste Disposal ◽  
Field Tests ◽  
Free Fall ◽  
Heat Emission ◽  
Centrifuge Modelling ◽  
Depth Of Penetration ◽  
Geotechnical Centrifuge ◽  
Pressure Changes ◽  
Deformation Patterns ◽  
Theoretical Analyses

A set of experiments, conducted on the Cambridge geotechnical centrifuge and which model the free-fall option for the subseabed disposal of heat-generating waste, is reported. The results reported relate to the morphological effects of model penetration (depth of penetration, deformation patterns, and closure) as well as to the pore pressure changes associated with this penetration. Results regarding the effect of heat emission (from the model penetrators) upon the surrounding soil are also presented. These results are discussed and compared with theoretical analyses and field tests, and conclusions are presented regarding both the processes attendant upon penetration and heating and the relevance of the modelling to the prototype event. Key words: centrifuge modelling, heat-generating waste disposal, projectile penetration.

Geophysical Modeling of a Low-Level Nuclear Waste Disposal Site

1982 ◽  
Vol 15 ◽  
Author(s):  
Keith A. Horton ◽  
Louis Isaacson ◽  
Rexford M. Morey
Keyword(s):  
Nuclear Waste ◽  
Waste Disposal ◽  
Field Tests ◽  
Nuclear Waste Disposal ◽  
Disposal Site ◽  
Waste Disposal Site ◽  
Depth Of Penetration ◽  
Monitoring Wells ◽  
Low Level ◽  
Geophysical Modeling

ABSTRACTGeophysical measurements can, depending on the techniques employed, be used at low-level nuclear waste disposal sites to map the subsurface stratigraphy, identify interfaces, locate objects and targets, and aid in selecting locations for obtaining sample cores and placing monitoring wells. The geophysical techniques of ground penetrating radar and electrical resistivity have been applied in a complementary manner at nuclear waste disposal sites. The data obtained from the field surveys have been integrated in developing geophysical models of these sites.A two-layer electromagnetic geologic model has been developed that allows the prediction of radar attenuation and depth of penetration. Field tests conducted at a lowlevel nuclear waste disposal site show values consistent with the model.

Field Tests of Guide Vanes and Runner Blades of a Large Bulb Turbine for Output Deficiency Diagnosis

2012 ◽  
Vol 212-213 ◽  
pp. 1057-1061 ◽  
Author(s):  
Zhong Liu ◽  
Zhu Qing Huang ◽  
Shu Yun Zou ◽  
Hong De Rao
Keyword(s):  
Field Tests ◽  
Economic Loss ◽  
Hydropower Plant ◽  
Test Results ◽  
Guide Vanes ◽  
Factors Affecting ◽  
Runner Blade ◽  
Main Factors ◽  
Theoretical Analyses ◽  
Bulb Turbine

The 3# bulb turbine in Hongjiang Hydropower Plant has faced the problem of output deficiency since its commission in Sept. 2003, which caused a large economic loss. Following simple theoretical analyses on the main factors affecting the turbine’s output and efficiency, the field test schemes were determined to measure the shapes and intervals of guide vanes and runner blades of the 3#, 5# and 6# turbines. The test results discover that the average blade intervals of the 3# turbine are generally less than those of the 5# one. Suggestions on runner blade installation adjustment and combined curve modification are given.

High Holding Power Torpedo Pile: Results for the First Long Term Application

2004 ◽  
Author(s):  
Jairo Bastos de Araujo ◽  
Roge´rio Diniz Machado ◽  
Cipriano Jose de Medeiros Junior
Keyword(s):  
Water Depth ◽  
Deep Water ◽  
Field Tests ◽  
Free Fall ◽  
Mooring System ◽  
Holding Power ◽  
Campos Basin ◽  
Anchoring System ◽  
Very High

Petrobras developed a new kind of anchoring device known as Torpedo. This is a steel pile of appropriate weight and shape that is launched in a free fall procedure to be used as fixed anchoring point by any type of floating unit. There are two Torpedoes, T-43 and T-98 weighing 43 and 98 metric tons respectively. On October 2002 T-43 was tested offshore Brazil in Campos Basin. The successful results approved and certified by Bureau Veritas, and the need for a feasible anchoring system for new Petrobras Units in deep water fields of Campos Basin led to the development of a Torpedo with High Holding Power. Petrobras FPSO P-50, a VLCC that is being converted with a spread-mooring configuration will be installed in Albacora Leste field in the second semester of 2004. Its mooring analysis showed that the required holding power for the mooring system would be very high. Drag embedment anchors option would require four big Anchor Handling Vessels for anchor tensioning operations at 1400 m water depth. For this purpose T-98 was designed and its field tests were completed in April 2003. This paper discusses T-98 design, building, tests and ABS certification for FPSO P-50.

scholarly journals Temperature Analysis of Obstacle Lighting Lamp Working under Various Ambient Conditions: Theoretical and Practical Experiments

2019 ◽  
Vol 9 (22) ◽  
pp. 4951
Author(s):  
Wotzka ◽  
Błachowicz ◽  
Weisser
Keyword(s):  
Numerical Model ◽  
Power Supply System ◽  
Heat Emission ◽  
Operating Conditions ◽  
Physical Models ◽  
Heat Sources ◽  
Ambient Conditions ◽  
Airflow Velocity ◽  
Light Emitting ◽  
Theoretical Analyses

The article presents the results of experimental and theoretical works aimed at determining the distribution of heat emitted by an obstacle lighting lamp. These kind of lamps are commonly applied as a warning for air traffic vehicles. There is a need for lighting devices with various intensities, whose application depends on the location and operating conditions. The overall aim of the author’s work is to develop a computer model that would enable us to conduct research aimed at determining the optimal parameters of lamp operation without the need to build many physical models. Measurements of heat emitted by a currently manufactured lamp were made, and based on these, a numerical model of the lamp operating under laboratory conditions was developed. The considered lamp has two heat sources, one of which is light-emitting diodes (LEDs), while the other heat source consists of stabilizers and other elements of the lamp power supply system. After positive experimental verification of the numerical model, theoretical analyses of heat emission under various meteorological conditions were carried out, while the values of ambient temperature and airflow velocity were changed; then, the influence of these parameters on the temperature distribution on the surface of the lamp was determined.

Jet Piercing of Oil Sands

1981 ◽  
Vol 103 (4) ◽  
pp. 330-335 ◽  
Author(s):  
R. R. Gilpin ◽  
E. M. Gates
Keyword(s):  
Experimental Investigation ◽  
High Pressure ◽  
Oil Sands ◽  
Dynamic Pressure ◽  
Field Tests ◽  
Pulse Frequency ◽  
Depth Of Penetration ◽  
Water Jets ◽  
Pressure Water ◽  
Pressure Nozzle

This paper describes the results of an experimental investigation of the penetration of oil sands by continuous and pulsed high-pressure water jets. Both laboratory and field tests were carried out to determine the influence of the jet dynamic pressure, nozzle diameter, pulse frequency, and total jetting time upon the depth of penetration.

Installation of dynamically embedded plate anchors as assessed through field tests

2015 ◽  
Vol 52 (9) ◽  
pp. 1270-1282 ◽  
Author(s):  
A.P. Blake ◽  
C.D. O’Loughlin
Keyword(s):  
Field Tests ◽  
Free Fall ◽  
Measurement Unit ◽  
Resistance Force ◽  
Embedment Depth ◽  
Acceleration Data ◽  
Plate Anchor ◽  
Central Shaft ◽  
High Degree ◽  
Force Profiles

A dynamically embedded plate anchor (DEPLA) is a rocket-shaped anchor that comprises a removable central shaft and a set of four flukes. The DEPLA penetrates to a target depth in the seabed by the kinetic energy obtained through free-fall in water. After embedment the central shaft is retrieved leaving the anchor flukes vertically embedded in the seabed. The flukes constitute the load-bearing element as a plate anchor. This paper focuses on the dynamic installation of the DEPLA. Net resistance and velocity profiles are derived from acceleration data measured by an inertial measurement unit during DEPLA field tests, which are compared with corresponding theoretical profiles based on strain rate–enhanced shear resistance and fluid mechanics drag resistance. Comparison of the measured net resistance force profiles with the model predictions shows fair agreement at 1:12 scale and good agreement at 1:7.2 and 1:4.5 scales. For all scales the embedment model predicts the final anchor embedment depth to a high degree of accuracy.

Centrifuge modelling of soil slopes reinforced with vegetation

2010 ◽  
Vol 47 (12) ◽  
pp. 1415-1430 ◽  
Author(s):  
R. Sonnenberg ◽  
M. F. Bransby ◽  
P. D. Hallett ◽  
A. G. Bengough ◽  
S. B. Mickovski ◽  
...  
Keyword(s):  
Slope Failure ◽  
Centrifuge Modelling ◽  
Mechanical Reinforcement ◽  
Root Reinforcement ◽  
Geotechnical Centrifuge ◽  
Post Test ◽  
Reinforcement Model ◽  
Root Properties ◽  
Centrifuge Model Tests ◽  
Made In

This paper reports a series of geotechnical centrifuge model tests conducted to investigate the mechanical reinforcement of slopes by vegetation. Some of the model slopes contained young willow trees, which were grown in controlled conditions to provide different root distributions and mechanical properties. Slopes were brought to failure in the centrifuge by increasing water pressures. The failure mechanisms were investigated photographically and using post-test excavation. By measuring the soil properties and pore pressures in each test when failure occurred, slope stability calculations could be performed for each slope failure. These back-calculations of stability suggest that only a small amount of reinforcement was provided by the root system even when it was grown for 290 days before testing. In contrast, the use of the measured root properties and a commonly used root reinforcement model suggests that significant reinforcement should have been provided by the roots. This disparity is probably due to either inappropriate assumptions made in the root reinforcement model or soil alteration produced by root growth. Such disparities may exist in the application of root reinforcement models to full-scale slopes and therefore require additional study. The modelling technique outlined in this paper is suitable for further investigation of root mechanical interactions with slopes.

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