مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

مطالعه عددی خونکاوی بوجود آمده توسط پمپ قلب در حال تغییر دور

نویسندگان
دانشگاه تهران
چکیده
امروزه، بیماری قلبی اولین عامل مرگ و میر در جهان به شمار می‌رود. پمپ قلب وسیله‌ای مکانیکی است که برای کمک به بیماران قلبی بکار می‌رود. خون افرادی که از پمپ قلب استفاده می‌نمایند، به دلیل اینکه با ابزار مکانیکی در تماس است، دچار صدماتی چون لختگی و خونکاوی می‌شود. هنگامیکه پمپ قلب از وضعیت سکون شروع به کار می-نماید، طی مدت کوتاهی سرعت زاویه ای آن افزایش یافته و سپس با سرعت ثابت کار می‌کند. تحلیل گذرای جریان خون در هنگامی که سرعت پمپ در حال تغییر است بسیار ارزشمند است. در این مقاله، جریان سیال داخل پمپ قلب و همچنین میزان آسیب وارده به گلبول‌های قرمز خون به صورت عددی تحلیل شد که در این تحلیل، اثر تنش برشی وارده از طرف پره های پمپ بر گلبول‌های قرمز نیز برسی شد. فشار کل و دبی در ورودی و خروجی پمپ و همچنین تغییرات سرعت نسبی جریان داخل پمپ و تحولات آن مورد بحث و بررسی قرار گرفت. در انتها، خونکاوی ایجاد شده در مدت زمان شبیه سازی محاسبه شد. در مطالعه انجام گرفته مشخص شد که هد و دبی پمپ هنگام شروع به کار آن افزایش می‌یابد. همچنین از تحلیل خونکاوی ایجاد شده مشخص گردید که پمپ قلب در زمان شروع به کار صدمه‌‌ای جدی به گلبول‌های قرمز خون وارد میکند و احتمال از هم پاشیدن آن‌ها در این مدت زمان کوتاه، زیاد است.
کلیدواژه‌ها

عنوان مقاله English

Numerical study on hemolysis induced by speed-changing heart pump

نویسندگان English

Muhammad Jabbarifar
alireza riasi
School of Mechanical Engineering, University of Tehran, Tehran, Iran.
چکیده English

Today, heart disease is the first cause of death in the world. The heart pump is a mechanical device used to help heart patients. The blood of people who use the heart pump, due to being in contact with the mechanical device, suffers from damage such as thrombosis and hemolysis. When the heart pump starts from a resting state, its angular velocity increases in a short period of time, and then operates at a constant rate .Transient blood flow analysis is very valuable when the pump speed is changing. In this paper, the flow of fluid inside the heart pump and the amount of damage to the red blood cells were analyzed numerically. In this analysis, the effect of shear stress caused by the blades of the pump into the red blood cells was also investigated. Total pressure and flow rate at the inlet and outlet of the pump as well as relative velocity changes of the pump inside the pump and its evolution were discussed. Finally, the hemolysis created during the simulation period was calculated. In the study, it was found that the pump head and flow rate start to increase when it starts working, and also hemolysis analysis showed that the heart pump during starting period causes serious damage to the red blood cells and the possibility of rupturing the red blood cells in this short period of time is high.

کلیدواژه‌ها English

Hemolysis
Heart pump
Transient Simulation
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