Measurement of the effective thermal conductivities of molding sands at high temperatures
Measurement of the effective thermal conductivities of molding sands at high temperatures
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高温下型砂有效导热系数的测量
DOI：
10.1007/bf02942784
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发表时间：
1996
期刊：
影响因子：
--
通讯作者：
J. Hartley
中科院分区：
文献类型：
--
作者：
S. Park;J. Hartley
众所周知，粘结型砂的有效导热系数取决于砂粒、粘结介质和空气等组分的体积分数、导热系数和排列方式。已知组分的排列受颗粒大小分布、平均大小和形状的影响。在本研究中，设计了一套线热源法的实验系统，测量了型砂在750°C温度下的有效导热系数。还研究了粘结剂含量、初始含水率、干密度和温度对四种砂型：硅砂、火山砂、锆英砂和铬铁矿砂的影响。结果表明，干密度对膨润土型砂有效导热系数的影响大于粘结剂含量和初始含水率的影响。膨润土粘结石英砂的有效导热系数最小值出现在500℃左右，西部膨润土粘结石英砂的有效导热系数高于南方膨润土粘结的硅砂，最高可达750℃。
It is well known that the effective thermal conductivity of bonded molding sands depends on the volume fraction, thermal conductivity and arrangement of the components e.g., sand particles, bonding medium and air. The arrangement of components is known to be affected by particle size distribution, average size and shape. In this study, an experimental system using the line-heat-source method was designed and effective thermal conductivities of molding sands at temperatures up to 750°C were measured. The effects of binder content, initial moisture content, dry density and temperature were also investigated for four selected sand types: silica, olovine, zircon and chromite sands. The effect of dry density on the effective thermal conductivity of bintonite-bonded molding sands turned out to be more significant than the effect of either binder content or initial moisture content. The minimum effective thermal conductivity for bentonite bonded silica sand occurred at about 500°C. The effective thermal conductivity of silica sands bonded with western bentonite was found to be higher than that of silica sands bonded with southern bentonite up to 750°C.