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Importance of reactive element interaction with C- and N- impurities for alumina scale growth and adherence on FeCrAl alloys
AuthorsW J Quadakkers ; D Naumenko ; L Singheiser et al.
Date published2003
AbstractFeCrAl alloys are used in a large number of high temperature applications. The growth rate and adhesion of protective alumina scales on heat resistant FeCrAl alloys are known to strongly depend on minor metallurgical additions of reactive elements such as Y La Ti Zr etc. Using high purity model as well as commercial FeCrAl alloys it is shown that the actual effect of the reactive elements on the oxide scale properties can be strongly affected by carbon and-or nitrogen impurities. It has been found that the carbon and nitrogen can interact with reactive elements forming carbide and-or carbo-nitride precipitates in the ferritic alloy matrix. This interaction changes the distribution of the reactive elements in the alloy and the way in which they are incorporated into the surface scale. Consequently the oxide growth and-or adherence can be affected in a positive as well as in a negative way depending on the exact amounts of the reactive element additions and the C-N-impurities. Experiments are described and results presented and discussed.
AuthorsW J Quadakkers ; D Naumenko ; L Singheiser et al.
Date published2003
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The benefits of coating propellers
AuthorsColin D Anderson
Shelf Location213b
AbstractDeterioration in propellers performance occurs in a variety of ways including corrosion cavitation impingement and marine fouling and these can have a considerable negative effect on propulsion efficiency. Appropriate coatings can mitigate the effects of certain types of deterioration but historically coating of propellers has not generally been used for this purpose. In recent years coatings based on a new technology for prevention of fouling have been developed. Known as 'Foul Release' these now have a proven track record on the outer hulls of fast and active ships. These ultra-smooth coatings rely on low-surface energy and water movement over the surface to keep fouling from attaching thus they are ideal for use on propellers where the water velocity around the blades is very high. Trials on propellers of ships using the Foul Release coating 'Intersleek' have shown that prevention of fouling can be achieved over long in-service periods. There is usually detachment on the blade edges due to the high cavitation forces but since fouling never occurs in these locations coating detachment in these areas does not have a deleterious effect overall. Some ship owners have reported reduced cavitation-induced noise and increased speed after coating their propellers with Intersleek. In order to quantify these more accurately sea trials were carried out over a measured mile using Newcastle University's dedicated research vessel Bernicia
AuthorsDate publishedColin D Anderson
2005
Shelf Location213b
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Third ISME conference on mechanical engineering
AuthorsIndian Inst of Tech
PublisherISME
AbstractThird int conf held in Delhi February 21 - 23 1980 Papers are Computer calculations of thermodynamic properties of refrigerant absorbent combinations Flow boiling of refrigerants The influence of turbulent prandtl number in numerical studies of convective heat transfer Heat transfer during fluidised bed plastic coating Turbulence measurements behind ribs in fully developed turbulent chennel flow Numerical study of swirling flow through annular diffusers using a modified mixing length model Effect of wind tunnel walls on the flow over a sphere Experimental investigation of swirling flow through annular diffusers Some of the aerodynamic characteristics of blade nozzle annular cascades in transonic flow regime Design and off design performance of a vaned diffuser for a centrifugal turbomachine A model of two dimensional incompressible flow through a biplaner cascade of aerofoils Optimum performance chart of flat symmetrical profile for an axial pump turbine runner Effect of swirl on turbulence intensity in a diverging flow passage Experimental investigation on the performance of multi hole nozzle jet pump with various nozzle configurations Some unsteady flow models in turbomachines Performance map of a reciprocating compressor fow low mass flow rates Investigation of rotating stall inception and propagation in axial flow compresors Hazardous effects of sulphur dioxide and particulate matter emission on vegetation - a case study in the City of Baroda
AuthorsDate publishedIndian Inst of Tech
1980
PublisherISME
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Wave-current loading on a vertical slender cylinder by two different numerical models
AuthorsN H Zaman ; R E Baddour
Date published2005
AbstractThe study of the effects resulting from the interaction of a combined wave-current field with any ocean structure is important for the design and performance evaluation of that structure. The prudent computation of forces exerted by waves and currents is essential in the study of the stability of an offshore structure. A study on the loading of an oblique wave and a current field on a fixed vertical slender cylinder in a 3D flow frame is illustrated in Zaman and Baddour (2004). The 3D expressions describing the characteristics of the combined wave-current field in terms of mass momentum and energy flux conservation equations are formulated. The parameters before the interaction of the oblique wave-free uniform current and current-free wave are used to formulate the kinematics of the flow field. These expressions are also used to formulate and calculate the loads imparted by the wave-current fluid flow on a bottom mounted slender vertical cylinder. In this work a 2D version of the above 3D model called Model 1 has been used for the numerical computations presented. The second model denoted model 2 is based on Euler equations. This model is formulated through the vertical integration of the continuity equation and the equations of motions Zaman et al (1997).
AuthorsN H Zaman ; R E Baddour
Date published2005
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A numerical study on the geometry of jet injection nozzle of a Coanda control surface
AuthorsDae Won Seo ; Joung Hyun Kim ; Hyochul Kim et al.
Date published2008
AbstractThe Coanda effect is a physical phenomenon which has been applied to various fields in aerodynamics. The Coanda effect demonstrates that a flow tangential to a solid surface generates low-pressure fields around it and consequently the flow remains tangential even along the curved surface as far as the pressure force surpass the centrifugal force of the flow turning about the surface. The many studies on the Coanda effect that have been carried out so far focus on the spiral jet type. The effect of the gap clearance of jet injection slit and the local curvature of the surface at the slit have been carefully surveyed. Studies have also been carried out on the effect of the jet blowing angle to the surface at the slit. The conventional practice of installing rudders downstream of propeller may not guarantee sufficient rudder force for proper manoeuvring of a ship at low speed. In previous studies the variation of the cross-sectional shape of a rudder and the addition of appendages have been investigated to improve the rudder performance. In other studies a water jet has been injected tangentially over rudder surfaces with or without a flap to enhance the rudder force by the resulting Coanda effect. In the present paper the proper locations of the slit and water intake of the gap between the horn and rudder surface have been numerically surveyed to support a design of a Coanda rudder. For verification of the numerical method98765 Numerical study on unsteady flow around an underwater vehicle with two pairs of mechanical pectoral fins
AuthorsDae Won Seo ; Joung Hyun Kim ; Hyochul Kim et al.
Date published2008
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The effect of bow shape on the springing-whipping response of a large ocean-going vessel: investigated by an experimental method
AuthorsGaute Stofhaug ; Torgeir Moan
Date published2007
AbstractWave-induced vibrations often referred to as springing and-or whipping increase the fatigue and extreme loading in ship hull girders. Both effects are disregarded in current ship rules. Various numerical codes exist for predicting the wave induced vibrations but so far they are not considered reliable. Another means to investigate the importance of the high frequency response although more resource demanding is to carry out full-scale measurements and-or model tests. Recently full-scale measurements of blunt ships have been carried out by DNV and in this paper one of these ships was considered and tested in a towing tank to evaluate the additional fatigue damage due to the wave-induced vibrations. Different excitation sources may excite the 2-node vertical vibration mode depending on ship design and it is not straightforward to determine which is more important. The relative importance of the excitation mechanisms are investigated by two approaches. The first separates the whipping from springing to illustrate their relative importance based on basic theory in combination with model test results. The linear and second order transfer functions are used in this procedure. The second deals with the effect of the bow design on the additional fatigue damage. Three different bows were tested. The first bow design is identical to the real ship. The second bow design is a simplified version of the first one by removing the bulb and flare. The third bow is fundamentally different from the two former blunt bows. Bow three is sharp pointed with a vertical sharp stemX44934 The effect of bowshape on the seakeeping performance of a fast monohull
AuthorsGaute Stofhaug ; Torgeir Moan
Date published2007
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A Fire Brigaders role in the fighting on board ships
AuthorsD Wynne
PublisherIMarE Conferences and Symposia
AbstractThe role of the UK local Authority Fire Brigade in fighting shipboard fires discussed with reference to the legal position data on incidents during 1980s special problems on ship fires operational procedures and specific duties
AuthorsDate publishedD Wynne
1980
PublisherIMarE Conferences and Symposia
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A study on safety evaluation method for automatic navigation system
AuthorsT Fuwa
Date published1990
AbstractA proposal on the method of official safety assessment for an automatic ship navigation system is made. It consists of four stages which are examination of the design by means of documents and charts inspection synthetic computer simulation full scale experiment and on-the-job assessment in practice. The philosophy for the determination of the official safety criteria is stated.
AuthorsT Fuwa
Date published1990
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EEC funds research on low-cost ship
AuthorsMER
Date published1983
AbstractA recent EEC report examines the effect of world recession and the oil crisis on European trade shipping and shipbuilding. It has prompted the EEC to fund research into developing more economical methods of ship building and operation with the emphasis placed on hull designs buoyancy propeller design less usual fuels microprocessor control and crew effectiveness. The UK research effort will be coordinated by the Institute of Marine Engineers.
AuthorsMER
Date published1983
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Environmental forces on offshore structures - statement of research requirements
AuthorsSUTGEF
Date published1989
AbstractLong term research requirements in the field of environmental forces on offshore structures have been identified and listed by The Society of Underwater Technology's Group on Environmental Forces - their findings are discussed in the key areas of environmental data and environmental loading and projects of prime importance are outlined which stress the need to develop reliability analysis techniques.
AuthorsSUTGEF
Date published1989
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Explosion from the auxiliary boiler of the MV Manapouri ON 335896 - Report of Preliminary Enquiry No 3472
AuthorsDepartment of Trade
Shelf Location15c
AbstractReport on the explosion of the boilers of the Motor Vessel Manapouri, whilst the ship was alongside Queens Dock in Cardiff on the 24 May 1974.
AuthorsPublisherDepartment of Trade
HMSO
Shelf LocationDate published15c
1975
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Inspection of pipelines based on reliability
AuthorsJuan Matias Acevedo
Date published2000
AbstractInspection of pipelines based on reliability is addressed. After some introductory information an outline is given of the objectives of in-service inspections. Next pipeline inspection by smart pigs is looked at briefly followed by remaining strength of pipelines based on data collected by smart pigs probabilistic characterization of corrosion data time dependant corrosion damage model and time dependant reliabilty models for pipelines.
AuthorsJuan Matias Acevedo
Date published2000
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Instrumentation on board large LNG carriers
AuthorsSommerfeldt
Shelf Location233d
AbstractThis paper describes the NEBB instrumentation system on board large LNG carriers. As a test case, NEBB installed on Norman Lady their standard Modularm II, modified to meet all regulations and requirements and with specifically designed measuring circuits.
AuthorsPublisherSommerfeldt
BBC Brown Boveri
Shelf LocationDate published233d
1981
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On the Dangers of Trim by the Bow
AuthorsR E D Bishop ; W G Price ; P Temarel
Date published1989
AbstractUsing only simple methods and an admittedly rudimentary mathematical model a number of features of ship stability directional instability oscillatory instability and safety are examined. Attention is focused on the effects of trim speed and metacentric height on the safety of the ship.
AuthorsR E D Bishop ; W G Price ; P Temarel
Date published1989
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Reflections on marine engineering education for the next millennium
AuthorsH Engja
Date published2000
AbstractIt is proposed that marine engineering teaching should focus on the modelling and computer simulation of systems so that future marine engineers are able to meet the quantitative system analysis requirements placed on them at the design stage.
AuthorsH Engja
Date published2000
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RoRo 78 Conference papers- The 3rd International Conference on Marine Transport using Roll-on/Roll-off Methods 14-6 July 1978 Hamburg
AuthorsRoRo
Shelf Location215f
AuthorsPublisherRoRo
BML
Shelf LocationDate published215f
1978
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RoRo 78 Proceedings- The 3rd International Conference on Marine Transport using Roll-on/Roll-off Methods 14-6 July 1978 Hamburg
AuthorsRoRo
Shelf Location215f
AuthorsPublisherRoRo
BML
Shelf LocationDate published215f
1978
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RoRo 84 Sessions 6-8 - The 7th International Conference on Marine Transport using Roll-on/Roll-off Methods 9-11 May 1984 Nice Volume 2 of 3
AuthorsRoRo
Shelf Location215f
AuthorsPublisherRoRo
BML
Shelf LocationDate published215f
1984
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Seaport development on Maplin Sands
AuthorsPort of London Authority
Shelf Location233a
AbstractThis booklet outlines the proposal for seaport development on Maplin Sands, with a description of the seaport and sections on its placement in reclaimed land, landward access, potential users, costs and economic appreciation. Appendices cover employment and hydraulic studies. Plans are included.
AuthorsPublisherPort of London Authority
Port of London Authority
Shelf LocationDate published233a
1974
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Stevens on Stowage 7th edition
AuthorsRobert White Stevens
Shelf Location230d
AbstractA book giving descriptive entries on an eclectic array of items relating to cargo and stowage, including entries on ballast, grain and corn, stowage of different cargoes, bills of lading, stowing at various ports, tonnage, 'oiling the sea', quarantine, foreign wine measures, and granite.
AuthorsPublisherRobert White Stevens
Longmans, Green, Reader & Dyer
Catalogue number721
Shelf LocationDate published230d
1878