The hollow fiber membrane modules act as dehumidifiers and regenerators to avoid gas–liquid entrainment problems in direct-contact dehumidification systems. A solar-driven hollow fiber membrane dehumidification experimental rig was designed to investigate its performance from July to September in Guilin, China. The dehumidification, regeneration, and cooling performance of the system between 8:30 and 17:30 are analyzed. The energy utilization of the solar collector and system is investigated. The results show that solar radiation has a significant influence on the system. The hourly regeneration of the system has the same trend as the temperature of solar hot water, which ranges from 0.13 g/s to 0.36 g/s. The regeneration capacity of the dehumidification system is always larger than the dehumidification capacity after 10:30, which increases the solution concentration and the dehumidification performance. Further, it ensures stable system operation when the solar radiation is lower (15:30–17:50). In addition, the hourly dehumidification capacity and efficiency of the system ranges from 0.15 g/s to 0.23 g/s and 52.4 to 71.3%, respectively, with good dehumidification performance. The COP of the system and solar collector have the same trend, in which their maximum values are 0.874 and 0.634, respectively, with high energy utilization efficiency. The solar-driven hollow fiber membrane liquid dehumidification system performs better in regions with larger solar radiation.
The complete chloroplast genome sequence of Pedicularis shansiensis Tsoong was determined and described. The circular chloroplast genome is 151,902 bp in length and contains a large single-copy region of 83,180 bp, a small single-copy region of 17,284 bp and two inverted repeat regions of 25,719 bp. The chloroplast genome contains 132 genes, including 86 protein-coding, 8 rRNA, and 38 tRNA genes. Phylogenetic analysis shows Pedicularis species cluster together and P. shansiensis forms a clade with P. dissect.
25 June 2025 in The International Journal of Artificial Organs
High shear stress and turbulence in a miniature axial blood pump are affected by the pump’s blade structure. which impacts the pump’s hemodynamics and hemocompatibility performance. This study designed blades for a miniature axial blood pump via computational fluid dynamics (CFD). The optimal blade angle distribution must improve hemodynamic and hemocompatibility performance under the designed operating conditions (45,000 rpm rotational speed and 3 L/min flow rate). First, the blade inlet angles β 1 were varied from −100° to −220°. Second, using the optimal β 1, the blade angle distribution was changed by setting different curvatures at different curvature positions. Finally, the relationships among blade angle distribution parameters and hemodynamic, hemolysis, and thrombosis risk were analyzed. The results indicated that angle distribution should avoid positive curvature, and that “the absolute value of negative curvature percentage should increase progressively with the increasing of curvature position.” Compared with the original impeller, the CFD and experimental results revealed an optimized impeller with a 17.4% increase in pressure head, a 2.1% increase in hydraulic efficiency, an 8.4% decrease in hemolysis index, and a 5.3% decrease in volume-averaged scaled activated platelet concentration. CFD-guided blade angle optimization can improve the hemodynamic and hemocompatibility performance of miniature axial blood pumps.