Internal flow characteristics and energy entropy production loss in high shear stress field of blood fluid devices(PDF)
《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]
- Issue:
- 2023年第10期
- Page:
- 1295-1301
- Research Field:
- 生物材料与力学
- Publishing date:
Info
- Title:
- Internal flow characteristics and energy entropy production loss in high shear stress field of blood fluid devices
- Author(s):
- YU Zheqin1; WANG Jie1; WANG Shuai2; XU Yan3; TAN Jianping3
- 1. College of Energy and Power Engineering, Changsha University of Science and Technology, Changsha 410114, China 2.College of Mechanical and Electrical Engineering, Henan University of Science and Technology, Luoyang 471003, China 3. College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
- Keywords:
- Keywords: blood fluid device computational fluid dynamics particle image velocimetry shear stress entropy production analysis
- PACS:
- R318
- DOI:
- DOI:10.3969/j.issn.1005-202X.2023.10.018
- Abstract:
- Abstract: Excessive shear stress-induced blood damage and hydraulic efficiency loss are common in blood fluid devices, which limit their ability to achieve safe, efficient, and stable long-term operation. Investigating the internal flow characteristics and energy entropy production loss under high shear stress can provide support for the research and optimization of devices. A nozzle model that can simulate high shear stress flow is designed and modeled, and both computational fluid dynamics for numerical simulation and particle image velocimetry for visualization experiments are used to analyze internal flow characteristics, shear stress, and energy entropy production loss. The flow characteristics associated with high shear stress and energy entropy production loss are investigated, and the correlation between entropy production loss and shear stress is analyzed. The study concluded that velocity gradients is a major factor causing high shear stress, and that local high flow velocity is not directly associated with shear stress.The energy loss in high shear stress flow fields is mainly derived from turbulent entropy production, and the turbulent entropy production at the mainstream section accounts for 97.7% of the total entropy production, mainly distributed in vortices and the regions with drastic changes in flow. The flow field energy entropy production and shear stress have obvious correlation and consistency in the distribution state and change trend. Suppressing the flow field velocity gradient can significantly reduce the flow energy loss and shear stress-induced blood damage.
Last Update: 2023-10-27