【摘要】 用不同几何尺寸的 MIG、透平和三叶后掠式奖,研究了非牛顿流体在搅拌槽内的传热。搅拌槽内装有同时起冷却表面和挡板作用的垂直管。数据关联时使用了笔者提出的剪切速率模型。通过172—184次试验,得到了夹套侧和直管侧的给热系数关联式: 对MIG桨, Nu_j=0.452R^*2/3Pr^*1/3Vis^1/6（d/D）^0.3（∑bisinθ/H）^0.337 Nu_c=0.0475R^*2/3Pr^*1/3Vis^1/6（d/D）^0.477（∑bisinθ/H）^0.347式中 Re^*为 200—18400,Pr^*为 80—2300。 对透平和和三叶后掠式桨, Nu_j=1.19Re^*2/3Pr^*1/3Vis^1/6（∑bisinθ/H）^0.74 Nu_c=0.0767Re^*2/3Pr^*1/3Vis^1/6（∑bisinθ/H）^0.523式中 Re^* 为25—6310,Pr^* 为115—9000。 与以往研究者的模型相比,笔者的剪切速率模型不仅适用于不同类型的搅拌桨,不同的冷却体系,以及夹套侧和内冷管侧的给热系数关联,而且其关联精度较高。更多还原

【Abstract】 Heat transfer of non-Newtonian fluids in agitated vessel equipped with vertical cooling tubes has been studied. The cooling tubes also act as baffles. For MIG impellers, based on data obtained from 172 and 184 times of experiments, following equations by using the new shear rate model presented in authors’ previous paper are proposed for correlating the heat transfer coefficients of both the jacket side and cooling tube side, respectively:where Re*, the generalized Reynolds number, extends from 200 to 18400 and Pr*, the generalized Prandtl number, extends from 80 to 2300. For Pfaudler impellers and flat blade disc turbines, following correlations are obtained with 184 and 183 data plots:where Re* ranges from 25 to 6310 and Pr* from 115 to 9000. The new shear rate model is applicable to correlating the heat transfer coefficient of various types of impellers and cooling systems with high accuracies.更多还原