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finite element technology was used in thermal calculation for the fluid in the storage tanks widely; however, the traditional finite element method might come into being numerical oscillation or distortion during the process of solving the big gradient

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, pressure, buried depth, soil temperature; soil thermal conductivity, oil viscosity, and oil density on the stochastic fluctuation of oil temperatures were investigated [ 6 ]. Finite element method is an effective method for temperature field analysis

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]. Borst and Boogaard [ 12 ] studied deformation and cracking in early age concrete modeled by finite element method considering hardening process of young concrete, heat production, stiffness evolution, and concrete creep. The numerical model of the solar

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An appreciation of usability of the finite element technique for the thermal analysis of stripe-geometry diode lasers is carried out in the present work. Thye technique appears to be very exact and surprisingly speed using even a standard IBM PC/AT microcomputer.

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Abstract  

New results of steady-state two-dimensional finite-element computations of temperature distributions of high power semiconductor laser arrays are presented. The influence of different thermal loads on the 2D temperature distribution in AlGaAs/GaAs gain-guided laser arrays is investigated. TheFEM model is tested by comparing it with analytical solutions. For numerical convenience, the latter is rewritten in a novel form, which is free of overflow problems. The maximum temperatures calculated by both methods agree within 1%. Several factors determining the thermal resistance of the device are quantitatively examined: the ratio of light emitting to non-emitting areas along the active zone, the amount of Joule losses, the current spreading, the solder thickness, and voids in the solder. This yields design rules for optimum thermal performance.

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Negative thermal expansion materials

Thermal properties and implications for composite materials

Journal of Thermal Analysis and Calorimetry
Authors: Michael Jakubinek, Catherine Whitman and Mary White

Abstract  

Finite element analysis is used to explore composites of negative thermal expansion materials with positive thermal expansion materials (ZrW2O8 in Cu and ZrO2 in ZrW2O8) and evaluate how thermal and mechanical properties, rates of cooling/heating, and geometry and packing fraction influence the overall expansion and thermal stress. During rapid temperature changes, the transient short-time thermal expansion can be considerably larger than the steady-state value. Furthermore, thermal stress in the composite can be large, especially at the interface between the materials, and can exceed the material strength.

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This work presents the modelling of heat transfer in a polymer sample submitted to a microwave field in the quartz column of a dilatometer surrounded by vacuum to avoid convection. The temperature rise is studied in transient state by the finite element method. It is assumed that a uniform and constant heat production is maintained in the entire volume of the sample. It is shown that it is possible to design the set composed of the sample and of the column to achieve a nearly uniform temperature in the whole volume of the sample while its temperature is raised from 20 to 250°C at a heating rate of 5 deg·min−1.

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. Tillage tool design by the finite element method: Part 2. Experimental validation of the finite element results with soil bin test . J. Agric. Eng. Res. 72 , 53 – 58 . Ono , I

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-stirred fluid. Cho et al. [ 8 ] studied the effects of the material variation through the thickness in functionally graded composites on temperature gradient and resulting thermal stress to optimize and control thermal stress using the finite element method. It

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vibrational modes of C 60 and C 70 via finite element method . Eur J Mech A-Solid 28 : 948 – 954 10.1016/j.euromechsol.2009.02.006 . 20. Fang , Q , He , G , Cai , WP et al. 2004

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