تحلیل عددی انتقال حرارت و پخش نانوذرات مغناطیسی در یک جریان غیرنیوتنی خون، تحت تأثیر میدان مغناطیسی غیر یکنواخت

نویسندگان

دانشگاه صنعتی خواجه نصیرالدین طوسی

چکیده

هدف از این تحقیق بررسی توزیع و انتقال حرارت نانوذره­های مغناطیسی درون یک مویرگ سرطانی با جریان غیرنیوتنی خون، تحت اثر میدان مغناطیسی غیریکنواخت خارجی، است. بدین منظور، معادلات حاکم پیوستگی، مومنتوم، انرژی، ماکسول و غلظت برای سیال غیرنیوتونی با مدل لزجت کاریو که تابعی از نرخ برشی می­باشد، در ماژول عددی کامسول مدل شده و به­صورت کوپل شده مورد تحلیل قرار گرفته است. در این تحقیق، رگ به­صورت سه­بعدی و با دیواره صلب فرض شده است. نتایج حاصل نشان­دهنده آن است که غلظت نانوذره­های مغناطیسی در دیواره بالایی مویرگ در زمان­های بالا به یک مقدار پایا می­رسد. و این تجمع بر دمای جریان خون اثر­گذار است. قدرت میدان مغناطیسی،         مغناطیس­پذیری و غلظت نانوذرات با دمای جریان خون در محل تجمع ذرات رابطه مستقیم دارد و با افزایش اندازه نانوذره­ها و سرعت ورودی، دمای جریان خون کاهش می­یابد به­طوری که در اندازه­های بالای nm 70 اثر حرارتی ذرات بسیار کم می­شود همچنین، فرض غیرنیوتنی بودن سیال تأثیر قابل ملاحظه­ای در نتایج دارد.

کلیدواژه‌ها


عنوان مقاله [English]

Numerical Analysis of Heat and Mass Transfer of Magnetic Nanoparticles in a Non-Newtonian Blood Flow, under Influence of Magnetic Field

نویسندگان [English]

  • mahdi keyhanpor
  • majid ghasemi
khaje nasir
چکیده [English]

The purpose of this study is to numerically investigate the heat and mass transfer of magnetic nanoparticles inside a 3D capillary with non-Newtonian blood flow, Under the influence of external non-uniform magnetic field. For this purpose, the governing equations including continuity, momentum, energy, Maxwell, and concentration were coupled and solved by COMSOL, a finite element based software. Blood is assumed as non-Newtonian fluid with Carreau viscosity model and the vessel wall is assumed to be rigid. the results indicate that the concentration of magnetic nanoparticles in the upper wall of the vessel at long times reaches a constant value. This accumulation affects the blood flow temperature. Magnetic field strength, magnetic susceptibility, and concentration of nanoparticles are directly related to the temperature of the bloodstream at the location of particles accumulation. By increasing the size of nanoparticles and inlet velocity, the blood flow temperature decreases so that in sizes above 70 nm, the thermal effect of particles becomes very low. Also, the non-Newtonian blood assumption has significant effect on the results.

کلیدواژه‌ها [English]

  • Magnetic Nanoparticles
  • Concentration
  • Magnetic Field
  • Temperature
  • Non-Newtonian
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