Research On Drag Reduction Characteristics Of Artificial Blood Vessel With Bionic Surface Structure

Blood vessels are an important part of the human circulatory system.Maintaining the health of blood vessels and ensuring stable blood flow is of great significance to human health.The blood flow resistance in the blood vessel is an important parameter that affects the fluid movement in the blood vessel.The lesions or blockages of blood vessels will cause abnormal blood flow resistance and increase the burden on the heart,thus endangering the cardiovascular health of the human body.The use of artificial blood vessels to replace diseased blood vessels is an important means to deal with vascular diseases,and the use of drag reduction technology to reduce the blood flow resistance of artificial blood vessels is an important research direction.scholars at home and abroad have carried out a lot of research on the methods of reducing fluid resistance,and various drag reduction structures such as non-smooth bionic structures,adaptive surfaces and superhydrophobic surfaces have appeared.The bionic groove structure shows good drag reduction effect.The microstructure of drag reduction has become an important method to improve the resistance reduction performance of artificial blood vessels,which can theoretically greatly reduce the blood flow resistance of blood vessels.In this paper,the characteristics of artificial blood vessels are firstly analyzed and modeled,and the flow state of blood in the simplified long and straight blood vessel model is studied by numerical simulation.The accuracy of the simulation method.After that,the drag reduction effect of V-shaped,rectangular and semi-circular dragreduction microstructures was preliminarily analyzed.According to the numerical simulation results,the V-shaped groove structure with good drag reduction rate,high achievability and good structural stability was selected for in-depth research.A variety of numerical simulations are carried out on the V-groove drag reduction microstructure.By changing parameters such as inflow velocity,groove width,groove depth,etc.,the effects of various variable conditions on the drag reduction effect of grooves are studied.The speed range is 3～6 m/s,the groove width is 0～0.3 mm,and the groove depth is 0～0.3 mm.Based on mastering the variation law of drag reduction rate,the reasons for the variation of drag reduction rate of grooves are analyzed through the velocity cloud map,velocity vector diagram and shear stress variation curve of blood vessel section,and the drag reduction mechanism of groove microstructure is revealed.