HWAHAK KONGHAK, Vol.22, No.5, 235-243, October, 1984
연속흐름 교반반응기에서의 액체흐름 특성
Liquid Flow Characteristics in a Continuous Flow Stirred Tank Reactor
초록
입구와 출구를 각각 반응기의 하부와 상부에 위치시키고 6-bladed turbine impeller를 사용한 연속흐름교반반응기에서의 액체 흐름특성을 연구하였다.
반응기내의 흐름지역을 입구지역, 임펠라지역과 재순환흐름지역으로 나누고 각 흐름지역의 흐름특성을 고려한 흐름모델을 세워 실험값과 비교하였다.
실험결과, 입류속도가 낮고 교반속도가 낮은 경우에는 입구지역이 플러그흐름특성을 가지며 제시된 모델이 적당하였다. 또한, 높은 입류속도이거나 교반속도가 큰 경우에는 입구지역이 재순환 흐름의 영향으로 완전혼합흐름특성을 가지며 제시된 모델이 적당하였다. 임펠라지역은 완전혼합의 특성을 가지며 교반속도의 증가에 따라 그 크기가 증가하였다.
반응기내의 흐름지역을 입구지역, 임펠라지역과 재순환흐름지역으로 나누고 각 흐름지역의 흐름특성을 고려한 흐름모델을 세워 실험값과 비교하였다.
실험결과, 입류속도가 낮고 교반속도가 낮은 경우에는 입구지역이 플러그흐름특성을 가지며 제시된 모델이 적당하였다. 또한, 높은 입류속도이거나 교반속도가 큰 경우에는 입구지역이 재순환 흐름의 영향으로 완전혼합흐름특성을 가지며 제시된 모델이 적당하였다. 임펠라지역은 완전혼합의 특성을 가지며 교반속도의 증가에 따라 그 크기가 증가하였다.
The flow characteristics of liquid in a continous flow stirred tank reactor（CFSTR） with a 6-bladed turbine impeller was investigated. The inlet and the outlet were located at the bottom center and the top edge of the reactor, respectively.
For the CFSTR, three flow zones （inlet zone, impeller zone and recirculation zone） were assumed and the theoretical residence time distributions based on the flow patterns wer compared with the experimental ones.
For the case of the lower inlet flow rate and the lower agitation speed, the experimental results showed that the flow pattern of the inlet zone was considered to be plug flow nature. For the higher inlet flow rate as well as the higher agitation speed, however, the flow pattern of the inlet zone was considered to be perfect mixing zone due to the considerable recirculation flow.
The impeller zone has a perfect mixing nature and the magnitude of the perfect mixing zone increased with agitation speed.
For the CFSTR, three flow zones （inlet zone, impeller zone and recirculation zone） were assumed and the theoretical residence time distributions based on the flow patterns wer compared with the experimental ones.
For the case of the lower inlet flow rate and the lower agitation speed, the experimental results showed that the flow pattern of the inlet zone was considered to be plug flow nature. For the higher inlet flow rate as well as the higher agitation speed, however, the flow pattern of the inlet zone was considered to be perfect mixing zone due to the considerable recirculation flow.
The impeller zone has a perfect mixing nature and the magnitude of the perfect mixing zone increased with agitation speed.