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Investigation of Charge Conduction and Self-Breakdown in Transformer Oil Conference Paper (PDF Available) July with 28 Reads How we measure 'reads'. The value of activation energy found in this investigation supports that the migration of hydrogen ions (H +) dominates the low-field conduction of oil impregnated paper .
by the fact that paper-oil or mass impregnated cable systems are still used in HVDC links. The use of cables systems with polymeric insulation would severely cut the costs of an HVDC : Dennis Van Der Born. Wang et al. studied the effects of the paper-aged state on space charge characteristics in oil-impregnated paper, and concluded that the amount of space charge, and.
Investigation into Heat Transfer Mechanisms in Enclosures H.B. Awbi*, I. Ward + and A. Hatton* *Department of Construction Management and Engineering, The University of Reading. Vehicle structural resonance modes are classified generally into rigid and flexible (non–rigid) body modes.
During motorcycle testing and development for design validation, it is often useful to understand these modes of vibration. Understanding rigid Cited by: 3. The problem is broken down into two subproblems; the convective heat transfer from the air-oil mixture in the housing to the solids and the heat conduction in the solid parts.
This modeling approach enables us to investigate the temporal and spatial evolution of the thermo-fluid phenomena and accurately predict the global system response during Cited by: 3.
Thermal conductivity enhancement of nanofluids Investigation into steady-state conduction mechanisms in oil impregnated paper. book depends upon the factors affecting their heat transport mechanisms.
More insight into the phenomenon of thermal heat conduction in. One of the latest advancements in injector technology is laser drilling of the nozzle holes. In this context, the spray formation and atomisation characteristics of gasoline, ethanol and 1-butanol were investigated for a 7-hole spark eroded (SE) injector and its ‘direct replacement’ Laser.
The ASME Digital Collection. COVID Resource Page. ASME’s authoritative, online reference of current and archival literature. It provides unparalleled depth, breadth, and quality of peer-reviewed content including journals, conference proceedings and ASME Press books. The aim of this paper is to investigate in depth whether adding nanoparticles or nanotubes to a fluid enhances its heat transfer capabilities.
For this reason, the thermal conductivities and viscosities of a selection of nanofluids were thoroughly examined. The systems studied were (a) ethylene glycol with added CuO, TiO2, or Al2O3 nanoparticles and (b) water with TiO2 or Al2O3 nanoparticles.
As shown in Fig. 10, the steady state temperature field of the driven gear tooth has been predicted based on the established steady state thermal analysis model and this is taken as the initial condition for the transient thermal analysis. The steady state thermal analysis simulates the continual rotation of the gear until thermal equilibrium is achieved, and the highest temperature of the steady state simulation Cited by: "Numerical Investigation into the Formation of CO, Oxygenated and Non-Oxygenated HC Emissions from Isooctane-and Ethanol-Fueled HCCI Engines".
KOMNINOS N.P. and RAKOPOULOS C.D. Energy and Fuels, American Chemical Society, Vol. 24, No. 3, pp.Electrical conduction at high fields in oil-impregnated paper p.
Influence of carbon particles on the breakdown and partial discharge inception voltage of aged mineral based transformer oil p. Partial discharge measurement and gas monitoring of a power transformer on-site p.
Laminar convection of a nanofluids consisting of water or ethylene glycol and Al 2 O 3 nanoparticles (d p = 42 nm) in a long horizontal tube (D iner = mm, D outer = mm, L = mm) with uniform heat flux around tube wall is considered.
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The computational domain used in the numerical simulations is shown in Fig. is same as the geometry of experimental device used by Wen and Ding Cited by: Electrical properties of oil/polymer composite systems with polymer film etched by sputtering in argon environment p.
27 Space charge formation in filled LDPE films p. 32 Electroluminescence from gold-containing polymeric thin films p. 37 Discrete states of carrier traps and electrical conduction mechanism in organic substances p.
Description Investigation into steady-state conduction mechanisms in oil impregnated paper. FB2
Publications, World Academy of Science, Engineering and Technology. Authors: Fury Khristianty Fitriyah Abstract: This study aims to identify the extent of the role of the Satuan Pengawas Intern (Internal Audit Unit) in detecting and preventing fraud in public universities in West Java under the Ministry of Research, Technology and Higher Education.
The thickness of the paper used for the study was 60 μm. In case of insulation, paper absorbs moisture from the surrounding more rapidly than the pressboard material. Hence, before dipping into transformer oil, papers were placed in an oven maintained at °C for 24 h and then impregnated in oil for ageing by: The mechanism principle of all the ceramic humidity sensors, i.e., ionic conduction, electronic conduction, solid-electrolyte and capacitive type, relies on the superficial water vapour adsorption based on chemical adsorption (chemisorption), physical adsorption (physisorption) and capillary condensation processes.
Most of the currently Cited by: Nanoemulsions (NEs) are colloidal dispersions of two immiscible liquids, oil and water, in which one is dispersed in the other with the aid of a surfactant/co-surfactant mixture, either forming oil-in-water (o/w) or water-in-oil (w/o) nanodroplets systems, with droplets 20– nm in size.
NEs are easy to prepare and upscale, and they show high variability in their by: 2. Maxwell first proposed the idea of suspending metallic particles in conventional heat transfer fluids in .He believed that the metallic particles (which have thermal conductivities that are significantly larger than that of liquids as shown in Figure 1) would increase the electrical and thermal conductivity of the idea was carried on throughout the next century as scientists Cited by: We show that a large set of nanofluid thermal conductivity data falls within the upper and lower Maxwell bounds for homogeneous systems.
This indicates that the thermal conductivity of nanofluids is largely dependent on whether the nanoparticles stay dispersed in the base fluid, form large aggregates, or assume a percolating fractal by: The emphasis centers on the thermal conductivity of nanofluids: its experimental data, proposed mechanisms responsible for its enhancement, and its predicting models.
A relatively intensified effort has been made on determining thermal conductivity of nanofluids from by: This paper mainly discusses the research and practice process of a laboratory curriculum by leading students to perform field investigation into time-honoured shops that have existed for more than 50 years in the downtown area of Tainan, Taiwan, and then search again for design elements and completing the design.
This summary covers representative developments from in diesel regulations, engine technology, and NOx, particulate matter (PM), and hydrocarbon (HC) is finalizing the Euro VI heavy-duty (HD) regulations for with the intent of technologically harmonizing with the US.
A newCited by: Yanget al. reported that when h-BN was added to an epoxy resin-impregnated insulation paper, its thermal conductivity increased by %. Meanwhile, the breakdown strength remained constant and the inhibition of space charges was observed.
Zhanget al. investigated the effects of the addition of boron nitride nanospheres into the epoxy resin Author: Yongzhe Tang, Peng Zhang, Mingxiao Zhu, Jiacai Li, Yuxia Li, Ziguo Wang, Liangsong Huang.
Fundamentals of Fluid Flow in Porous Media. Chapter 4 Immiscible Displacement Buckley-Leverett Theory. One of the simplest and most widely used methods of estimating the advance of a fluid displacement front in an immiscible displacement process is the Buckley-Leverett method.
Nanofluids, the fluid suspensions of nanomaterials, have shown many interesting properties, and the distinctive features offer unprecedented potential for many applications. This paper summarizes the recent progress on the study of nanofluids, such as the preparation methods, the evaluation methods for the stability of nanofluids, and the ways to enhance the stability for nanofluids, the Cited by: Measurement and Evaluation of Aerodynamic Noise Recently, aerodynamic noise which originates in the flow of the body surroundings is actualized as a main cause of an automobile interior noise when running at high speed, because engine, power train and tire noise have been greatly by: 4.
After reaching steady-state conditions the oil covered surfaces are analysed concerning heat transfer coefficients.
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The paper deals with a theoretical investigation into the ways in which fluid properties influence the optimal geometrical parameters of dry running twin screw compressors with uniform and dual lead rotors.
The paper first. The paper presents a simple and an accurate formula that has been developed for the conduction angle (δ) of a single phase half-wave or full-wave controlled rectifier with RL load. This formula can be also used for calculating the conduction angle (δ) in case of A.C.
voltage regulator with inductive load under discontinuous current mode.Thermal Conductivity of Nanoparticle - Fluid Mixture. A steady-state hot-wire method for thermal conductivity measurements of fluids.
An investigation into the effect of nanoclusters growth on perikinetic heat conduction mechanism in an oxide based by: Rating methodology of high voltage mass impregnated DC cable circuits.
(). Analysis of voltage-time breakdown data for oil-impregnated paper insulation,” Electrical Insulation, Investigation into the conservatism of high voltage cable rating methods: A comparison between IEC and Finite Element Analysis,” Author: Ziyi Huang.
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