黄原胶在热管生物反应器中传热数值模拟

采用计算流体力学(CFD)方法,研究了多种因素对黄原胶水溶液在传统反应器与热管生物反应器中传质与传热状况的影响,通过数值模拟得到了反应器中流动场、温度场和全釜死区分布.结果显示:经典最大叶片式桨及改进最大叶片式桨都具有"双循环"流型结构,在釜内形成了良好的主体循环流动,有利于改善反应器内的传质与传热,验证了热管的使用没有对反应器中的流动场造成严重的影响;而温度场的比较则表明:热管的使用明显提高了反应器的传热性能,使反应器中的整体温度有明显下降.

Numerical Simulation of Heat Transfer of Xanthan Gum in Heat Pipe Bioreactor

In this study, the computational fluid dynamics （CFD） method is used to study the influence of various factors on the mass and heat transfer of the Xanthan gum fermentation in the traditional and the heat pipe bioreactor. The macro flow field, temperature fields and dead-zone distribution in the reactor are obtained by numerical simulation. In this highly viscous pseudoplastic fluid system, both Maxblend impeller and the improved Maxblend impeller have ＂two-cycle＂ flow type structure which can form a good subject in circulation flow in the highly viscous pseudoplastic fluid system reactor. It is proved the heat pipe does not cause serious impact on the flow field. Comparison of the temperature fields shows that the heat pipe greatly improves the heat transfer performance and results in significant decrease of overall temperature in the reactor.