设计并搭建了中空纤维透析系统试验装置,研究了血液输运过程中毒素在3个不同区域(内环、中环、外环)内的流动及传质特性,测定了毒素的出口浓度和清除率,对测试结果进行了显著性差异分析,并对毒素在清除过程中的不均匀特性所造成的原因进行了分析和探讨.结果表明:毒素的清除效果在流经不同区域时,存在严重的不均匀特性,中环和内环比较接近,而外环和内环之间存在很大的差异;另外,透析液流量的增加,有助于毒素的清除效果,当透析液流量从低流量(500m L·min^(-1))增加到高流量(1 000 m L·min^(-1))时,内环和外环的出口浓度偏差从15.00%下降到6.20%,清除率偏差从16.70%下降到5.20%,显著性差异从0.008上升到0.020,透析液流量的增加对改善内环和中环的清除效果尤为显著.
Numerical simulation, based on simple reaction models that manifest the deposition quality of silicon from silane, was undertaken to investigate the horizontal reactor, with longitudinal and transversal aspect ratios of10 and 4, respectively. The effects of Rayleigh(Ra) and Reynolds(Re) numbers on the Si deposition rate in these turbulent-type reactors are discussed. The results show that the time-averaged deposition rate is fairly uniform and fast, although the instantaneous deposition is non-uniform in these turbulent reactors. In addition, the increase of the Re number within a certain range can compensate for the path loss of the reactant and obviously enhance the downstream deposition rate, but deteriorate the transverse distribution of the deposition.
