Effects of Micro-Particle Diameters and Low Fluid Velocities on Effective Thermal Parameters of Micro-Particle Packed Bed as a Biothermal Reactor
Effects of Micro-Particle Diameters and Low Fluid Velocities on Effective Thermal Parameters of Micro-Particle Packed Bed as a Biothermal Reactor
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DOI：
10.4028/www.scientific.net/amr.516-517.15
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发表时间：
2012-05
期刊：
影响因子：
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通讯作者：
Yi Xu;L. Wang;Yanqian Zhong;Yihua Zheng
中科院分区：
文献类型：
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作者：
Yi Xu;L. Wang;Yanqian Zhong;Yihua Zheng
在恒壁温(60℃)条件下，实验研究了微粒直径(DP=0.4~1.1 mm)和低流速(v=5ml/min、3ml/min和1ml/min)对水在作为热生物传感器反应器的微粒填充床中流动时的换热行为的影响。有效热物性参数随颗粒直径和流体速度的减小而减小。这主要是由于填充材料的导热性较差，导致热阻和水力阻力较大。因此，选择导热性较好的填充材料来强化传热是非常重要的，这有利于全面检测酶催化反应过程中产生的热量。与文献中发表的结果相比，由于实验条件的不同，两者之间存在着相当大的差异。二维热传导模型预测的温度分布与实际测量结果吻合较好，但在靠近进口的区域略有超前预测。
The effects of micro-particle diameters (i.e. dp=0.4~1.1mm) and low fluid velocities (v=5ml/min, 3ml/min and 1ml/min) on the heat transfer behavior of water flowing through a micro-particle packed bed as a reactor of thermal biosensor were investigated experimentally under constant wall temperature conditions (i.e. 60°C). The effective thermal parameter is smaller with decreasing the particle diameter and fluid velocities. This is mainly due to the poor thermal conductivity of the filling materials which leads to a larger thermal resistance and hydraulic resistance. As such, it is very important to select a filling material with better thermal conductivity to enhance heat transfer, which is favorable to completely detect the heat created during the enzyme-catalyzed reaction. Comparing the correlations of both this work and those published in the literature, there are considerable discrepancies among them due to different experimental conditions. The two-dimensional heat transfer model that predicts the temperature distributions agree reasonably well with actual measurements except a slight over-prediction in the region close to the inlet.