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

针对小展弦比泰勒涡（Taylor Vortex Flow，TVF）流场由于上下边界条件附近存在Ekman边界层而产生混沌复杂流动的特点，研制了TVF流场超声速测量系统。生物反应器是TVF的实际应用之一，它能够实现更温和的混合过程，保护动物细胞免受更高份额流量的损害。连续的瞬时和平均速度分布通过使用超声多普勒速度剖面仪（UVP）获得。超声时域相关法（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，但目前的测量能力与UVP法相比还不高。在研究过程中，我们着重于UTDC测量系统的升级开发，并对部分时空速度场进行了傅里叶变换频谱分析，结果与UVP的结果吻合较好。

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.