Evaluating the effects of different CKRT circuit chamber designs on flow in a venous air trap chamber using computational fluid dynamics

Abstract

[Introduction] The flow in a venous air trap chamber of the CKRT circuit was visualized using computational fluid dynamics simulation to investigate the effects of different chamber designs. [Methods] A 33% glycerin solution (working fluid) was poured into a 15 mL venous air trap chamber at a flow rate of 150 mL/min, and this was visualized by the simulation method. The effects of the inflow method of fluid flow into the venous air trap chamber, and the presence of a filter were evaluated. The results of each simulation case calculation are illustrated with streamlines and the velocity contour of the flow field. [Results] In the horizontal inflow method, the working fluid flowed down to the outlet with a swirling motion, regardless of the presence or absence of a filter, and the flow rectification effect of the filter was confirmed at the bottom of the venous air trap chamber. [Conclusion] Computational fluid dynamics simulation revealed that a flow without stagnation was achieved throughout the venous air trap chamber throughout which the horizontal inflow method and filter facilitated fluid flow without stagnation.