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首页> 外文期刊>International Journal of Heat and Mass Transfer >ESTIMATE OF THE DIFFUSION COEFFICIENT IN CO BASED LIQUIDS
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ESTIMATE OF THE DIFFUSION COEFFICIENT IN CO BASED LIQUIDS

机译：基于Co的液体中扩散系数的估计

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摘要

The experimental determination of the diffusion coefficient of given species into liquid alloys is difficult because of the unavoidable contribution of the convection. This remark applies to the case of tungsten (W) and carbon (C),introduced in liquid cobalt (Co) through the dissolution of tungsten carbide (WC). In the present work, the flow patterns produced by two different conditions of electromagnetic stirring of the liquid Co bath are computed. The electromagnetic forces which are induced by a high frequency induction coil are calculated with an integral method. They are introduced into a finite volume code for calculating the flow field. The velocity characteristics which are determined together with the experimental values of the rate constants [O.Lavergne,C.Allibert, Dissolution mechanism of WC in Co based liquids, High Temperature, High Pressures 31(1999)]for the dissolution of WC in the stirred liquid Co at 1450 deg C lead to evaluate the diffusion coefficient to 2 10~-9 m~2 s~-1. It is remarkable that the values of D which are deduced for each case differ only from 14/100.
机译：由于对流的不可避免的贡献，很难通过实验确定给定物质在液态合金中的扩散系数。此注释适用于通过溶解碳化钨（WC）在液态钴（Co）中引入的钨（W）和碳（C）的情况。在本工作中，计算了由两种不同的电磁搅拌液态Co浴条件产生的流型。由高频感应线圈感应的电磁力通过积分法计算。它们被引入到用于计算流场的有限体积代码中。与速率常数的实验值一起确定的速度特性[O.Lavergne，C.Allibert，WC在Co基液体中的溶解机理，高温，高压31（1999）]在1450℃搅拌液态Co导致扩散系数达到2 10〜-9 m〜2 s〜-1。值得注意的是，每种情况下得出的D值仅与14/100不同。

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