本文对空气与高温烧结水泥颗粒的气固换热规律进行了非稳态实验研究和数值模拟。通过实验分析了空气速度、颗粒初始温度、颗粒大小对对流换热系数的影响，水泥颗粒直径为8．88cm和5．94cm，水泥颗粒初始温度约为500℃和700℃，空气速度范围1—4m／s，得到了实验范围内空气绕流烧结水泥颗粒的对流换热经验关联式。结果表明：高温烧结水泥颗粒冷却过程中辐射换热热流密度与对流换热热流密度相当，不可忽略；实验所得准则数Nuf与Red的指数关系为0．5。对直径为8．88cm的水泥颗粒对应的试验工况进行了数值模拟，数值模拟结果与实验结果符合较好，误差在20％以内。
The transient experimental and numerical investigation on the heat transfer between air and sintered cement ball of high temperature is presented in this paper. The influences of air velocity, initial temperature, cement ball diameter on the heat transfer coeilicient are experimentally studied, air velocity ranging from 1 to 4 m/s, diameter being 8.88 cm or 5.94 cm and initial temperature being about 500℃ or 700℃. An empirical correlation is proposed within the experimental range. The radiation heat flux has the same order of convection heat flux during the cooling process of cement ball of high temperature; therefore, the influence of radiation could not be ignored. The Nuf has exponent relation to Red, and the exponent value is 0.5. Moreover, the numerical simulation is carried out, corresponding with the experimental research on cement ball of 8.88 cm diameter, and the numerical simulation results are in agreement with experimental results, with error less than 20%.
参考文献
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