Development of a bioreactor with high growth efficiency for an indifferent cellar as a stem cell by using the chaos mixing Taylor vortex flow

针对泰勒涡流在上、下边界附近由于Ekman边界层的存在而产生的混沌复杂流动，研制了一套小展弦比超声测速系统。生物反应器是TVF的实际应用之一，它可以实现较温和的混合过程，保护动物细胞免受较高份额流动的损害。使用超声多普勒速度剖面仪(UVP)获得连续的瞬时速度分布和平均速度分布。超声时间域相关法(UTDC)是测量固液多相流中浓度分布和速度的另一种实用方法，但目前的测量能力不如UVP法。在研究中，我们重点研究了UTDC测量系统的升级，并用傅里叶变换的频谱分析方法进行了部分时空速度场的计算，得到了与UVP测量结果相一致的结果。

Ultrasound velocity measuring system for a Taylor Vortex flow(TVF) was developed with a small aspect ratio, where the chaotic complicated flow was generated because of the Ekman boundary layer near the upper and lower boundary conditions. Bioreactors are one of the practical applications for an TVF which enables a milder mixing process protecting the animal cell from the damage of higher share flows. Successive instantaneous and mean velocity profiles were obtained by using an Ultrasound doppler Velocity Profiler (UVP). An Ultrasound Time Domain Correlation method (UTDC) is another practical method for measurement of the concentration distribution in the solid liquid multiphase flows as well as the velocity measurement, however the present measuring ability is not high compared with the UVP method. In the study, we focused on the development for grading up of the UTDC measuring system and partly the spatiotemporal velocity field was carried out with the spectrum analysis of the Fourier transform, which resulted in good agreement with the one from the UVP.