Sains Malaysiana 46(10)(2017): 1923–1933

http://dx.doi.org/10.17576/jsm-2017-4610-31

 

The Influence of Geometrical Shapes of Stenosis on the Blood Flow in Stenosed Artery

(Pengaruh Bentuk Geometri Stenosis ke atas Aliran Darah dalam Arteri Stenos)

 

SARFARAZ KAMANGAR^1*, IRFAN ANJUM BADRUDDIN², N. AMEER AHAMAD³, KALIMUTHU GOVINDARAJU⁴, N. NIK-GHAZALI¹, N.J. SALMAN AHMED⁵,

A. BADARUDIN¹ & T.M. YUNUS KHAN⁶

 

¹Department of Mechanical Engineering, University of Malaya, 50603 Kuala Lumpur, Federal Territory, Malaysia

 

²Department of Mechanical Engineering, College of Engineering, King Khalid University, Abha - 61421, Kingdom of Saudi Arabia

 

³Mathematics Department, Faculty of Science, University of Tabuk, Saudi Arabia

 

⁴Department of Mechanical and Industrial Engineering, Mekelle University, Mekelle, Ethiopia

 

⁵Department of Mechanical and Industrial Engineering, Sultan Qaboos University, 33, Alkhoud, Muscat, 123, Oman

 

⁶Department of Mechanical Engineering, CMR Technical Campus, Hyderabad, India

 

Diserahkan: 9 Mac 2016/Diterima: 20 Mac 2017

 

ABSTRACT

The present work was carried out to investigate the blood flow behavior and the severity of blockage caused in the arterial passage due to the different geometries such as elliptical, trapezium and triangular shapes of stenosis. The study was conducted with respect to various sizes of stenosis in terms of 70%, 80% and 90% area blockage of the arterial blood flow. The study was carried out numerically with the help of advance computational fluid dynamic software. It was found that the shape of the stenosis plays an important role in overall pressure drop across the blockage region of artery. The highest level of pressure drop was observed for trapezoidal shape of stenosis followed by elliptical and then by triangular shaped stenosis. The wall shear stress across the stenosis is great for trapezoidal shape followed by triangular and elliptical stenosis for same blockage area in the artery.

 

Keywords: CFD; coronary artery; non-Newtonian flow; stenosis

 

ABSTRAK

Kajian ini dijalankan untuk mengkaji sifat aliran darah dan keterukan laluan arteri yang tersumbat disebabkan oleh geometri stenosis yang berbeza seperti elips, trapezium dan bentuk segi tiga. Kajian ini dijalankan dengan pelbagai saiz stenosis pada kadar saiz sumbatan laluan arteri 70%, 80% dan 90%. Kajian ini dijalankan dengan kaedah berangka menggunakan perisian dinamik bendalir. Hasil kajian mendapati bahawa bentuk stenosis memainkan peranan penting dalam penurunan tekanan keseluruhan pada kawasan arteri yang tersumbat. Tahap tertinggi kejatuhan tekanan diperhatikan berlaku pada stenosis yang berbentuk trapezoid diikuti oleh elips dan kemudian oleh stenosis berbentuk segi tiga. Tegasan ricih permukaan seluruh stenosis yang paling besar adalah untuk bentuk trapezoid, diikuti oleh stenosis segi tiga dan elips.

 

Kata kunci: Aliran bukan Newtonian; arteri koronari; stenosis; CFD

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*Pengarang untuk surat-meyurat; email: sarfaraz.kamangar@gmail.com