Effect Of Vortex Generator On Blood Flow Characteristic On Real Patient Specific Data

Mohd Fizal, Nursyasya Amanina (2020) Effect Of Vortex Generator On Blood Flow Characteristic On Real Patient Specific Data. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Blood clot coagulation is the main concerned for people who are using Bileaflet Mechanical Heart Valve to replace the ruptured valve. Different design of vortex generator can affect the blood flow at the vicinity of the mechanical heart valve and therefore the velocity, pressure drops and wall shear stress are needed to be investigated. The study only includes steady state condition during peak systole at the aorta. The blunt edges vortex generators (without the aorta) showed lower average velocity with value of 0.80 m/s compared with the sharp edges of vortex generator. The blunt edges of vortex generator also improved the pressure gradient of the blood flow and the result was found 3.64 mmHg compared to the previous study which shows pressure gradient of 10.45 ± 0.94 mmHg. Meanwhile, the wall shear stress was found 10.24 Pa which shows some reduction compared with the sharp edges of vortex generator. A blunt edges of Co-rotating vortex generator is considered a good application as it reduce the flow separation at the vicinity of the leaflets as well helps in reducing the formation of thrombosis. However, to compare with the mechanical heart valve with aorta, the result with the aorta is less prone to blood clotting. A reduction with results of 2.3955 mmHg and 8.845 Pa in pressure drop and wall shear stress respectively indicates more delayed flow separation compared with the mechanical heart valve without aorta. This shows the simulation with the aorta needs to be included to investigate the reduction in blood clot.

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