Mass Transfer. Vol. 7‚ pp. 1187-I 194. Pergamon Press 1964. Printed in Great Britain HEAT TRANSFER IN AN ANNULUS WITH VARIABLE CIRCUMFERENTIAL HEAT FLUX? W. A. SUTHERLAND: and W. M. KAYS§ (Received 10 March 1964) Abstract-An analysis of heat transfer in a concentric circular tube annulus with an arbitrarily prescribed heat flux around the periphery of either wall‚ or both walls‚ is presented. Solutions have been obtained for the hydrodynamically and thermally fully developed condition
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What’s the difference between resistance and resistivity? Resistance is the obstruction offered to the flow of current by a conductor. Resistivity is the obstruction offered to the flow of current by UNIT AREA OF the conductor. So basically‚ resistance is the property of the object (say a copper wire)‚ whereas resistivity is the property of the substance (copper). And so resistance depends upon the properties of the object. Whereas resistivity depends upon the properties of the metal.
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Faraday’s Law of Electromagnetic induction where whenever a conductor cuts magnetic flux‚ dynamically induced electromotive force is produced‚ and this causes current to flow if the conductor/conductors is closed. The direction of induced current is given by Fleming’s right hand rule. A DC generator consists of these vital parts: o Yoke- It is the outer frame of a DC and it is made up of cast iron or steel. It carries the magnetic flux produced by field
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fields. It is given by the following equation in terms of the electric and magnetic fields F q(E vB) The induced emf in a conductor of length l moving with a speed v in a uniform magnetic field of flux density B can be determined by a e vB dl b In a coil of N turns‚ the induced emf can be calculated by e Concept map of electromechanical system modeling d dt where is the flux linkage of the coil and the minus sign indicates that the induced current
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Introduction to the Magnetic Treatment of Fuel By R.J. Kita Hydrogen is the lightest and most basic element known to man. With its simple structure comprised of only one proton and one electron‚ it is one of the major constituents of all hydrocarbon based fuels. By studying the response of hydrogen with respect to magnetic fields and the accompanying increased energy output‚ much can be learned and applied to other related fuels. In the oxidation/combustion of hydrocarbon fuels‚ it is the outer shell
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eddy current braking system for high speed. For such a breaker‚ we give analytical formulas considering end effects for its magnetic field‚ eddy current distribution‚ forces according to the secondary relative permeability‚ and conductivity. The results given here are purely analytic & applicable. INTRODUCTION The term “EDDY” Focault Bae J. S.(2004) found that when magnetic flux linked with a metallic conductor changes‚ induced currents are set up in the conductor in the form of closed loops. These
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characteristic function. Memristor theory was formulated and named by Leon Chua in a 1971 paper. Chua strongly believed that a fourth device existed to provide conceptual symmetry with the resistor‚ inductor‚ and capacitor. A device linking charge and flux (themselves defined as time integrals of current and voltage)‚ which would be the memristor‚ was still hypothetical at the time. However‚ thirty-seven years later‚ on April 30‚ 2008‚ a team at HP Labs led by the scientist R. Stanley Williams announced
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with variable suction is considered. The fluid flow is unsteady and a variable magnetic field is transversely applied to the plate. Evaluation of velocity gradients‚ temperature gradients and concentration gradients across the plate is done. Observations and discussions of the effects of various parameters on flow variables are done. The non-dimensional parameters observed and discussed are Hall parameter‚ M; Magnetic number‚ M 2; Eckert number‚ Ec; Rotational parameter‚ Er; Suction parameter‚ S
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PHYSICS HIGHER SECONDARY SECOND YEAR VOLUME - I Revised based on the recommendation of the Textbook Development Committee Untouchability is a sin Untouchability is a crime Untouchability is inhuman TAMILNADU TEXTBOOK CORPORATION COLLEGE ROAD‚ CHENNAI - 600 006 c Government of Tamilnadu First edition - 2005 Revised edition - 2007 Dr. S. GUNASEKARAN Reader Post Graduate and Research Department of Physics Pachaiyappa’s College‚ Chennai - 600 030 CHAIRPERSON Reviewers P SARVAJANA
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vacuum along z-direction. What can you say about the direction of electric and magnetic field vectors? 1 A resistance R is connected across a cell of emf ε and internal resistance r. A potentiometer now measures the potential difference between the terminals of the cell as V. Write the expression for ’r’ in terms of ε‚ V and R. 1 The permeability of a magnetic material is 0.9983. Name the type of magnetic materials it represents. 1 Show graphically‚ the variation of the de-Broglie
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