Particle image velocimetry experiment of blood flow through stent in artery bifurcation aneurysm problem

Mokhtar, N. Hafizah; Abas, Aizat; Teong, Soon Lay; Razak, Nordin Abd

doi:10.1063/1.4965215

Cited by 3 publications

(3 citation statements)

References 11 publications

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“…Figure 6 (a) is the RAA model. The method of using Perspex as a model for PIV experiment has been done by many researchers (Hafizah Mokhtar et al 2017;Mokhtar et al 2016;Raschi et al 2012;Tateshima et al 2002).…”

Section: Particle Image Velocimetry Experiments (Piv)mentioning

confidence: 99%

Stent Porosity Efficiency in Treating Wide-Neck Saccular Renal Artery Aneurysm

Bakar¹,

Abas²,

Razak³

2020

JAFM

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Renal arteries are the arteries that supply blood to the kidneys. Renal arteries are the arteries that supply blood to the kidneys. Renal artery aneurysm (RAA) is the second most common visceral aneurysm to occur, which accounts for 22% of the visceral aneurysm. In general population, RAA rate of occurrence was only 0.1%. However, due to the extensive used of angiography technique, RAA has been discovered more frequently. Some claimed that the previous rate of incidence should be higher now because of the capability of angiography. The rupture of this aneurysm could result in haemorrhage, kidney lost and mortality. The size of the renal artery which is different compared to other types of arteries such as the abdominal aorta could produce different flow condition when the artery is inflicted with RAA condition. Thus, a thorough analysis is desired as RAA studies are very limited compared to other aneurysm conditions. In this study, the efficiency of the stent porosity was investigated in treating the RAA. Fluid-structure interaction (FSI) simulations and particle image velocimetry (PIV) experiments were the approaches taken to investigate the flow patterns of the blood when the stent of different porosities was placed in the aneurysm entrance. The effect of wall shear stress (WSS), the deformation of the artery and von Mises stress were also observed in determining the possibility of aneurysm rupture. The study found that the placement of stent of different porosities succeeds in providing an obstruction to the blood from circulating inside the aneurysm sac. This in turns reduced the WSS experienced by the aneurysm sac up a significant value of 96%. This reduction is crucial in order to prevent the aneurysm from rupture. Moreover, the placement of the stent provided support to the renal artery and preventing it from experiencing buckling failure. The maximum deformation of the artery reduced by 42% with stent was placed in the renal artery. In fact, the von Mises stress decreased below the threshold limit of 0.5 MPa with the presence of the stent. In addition, the study found that the stent of porosity 80% has a similar impact to the stent of lower porosity in the case of RAA at main renal artery.

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Section: Particle Image Velocimetry Experiments (Piv)mentioning

confidence: 99%

Stent Porosity Efficiency in Treating Wide-Neck Saccular Renal Artery Aneurysm

Bakar¹,

Abas²,

Razak³

2020

JAFM

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“…PIV technique is not an uncommon procedure especially in fluid dynamics study and in bioengineering study relating to blood flow. The technique has been developed since the early 1980's (Mokhtar, Abas, Teong, & Razak, 2016), and it is considered as a non-intrusive optical technique that is capable in providing measurements of the instantaneous velocity vector field in a plane located in the flow region of interest (Ducci, Pirisi, Tzamtzis, & Burriesci, 2016). The PIV setup is correlated with optical access of the designed in-vitro testing loops to exactly simulate the heart and vascular system (Kaminsky et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Bark et al (2016), observed the flow fields generated by different textile fabrication techniques through time-resolved PIV technique. Mokhtar et al (2016), performed the PIV experiment to analyze the effect of stent placement on the flow pattern, velocity, and pressure with hope to reduce the size of the aneurysm issue.…”

Section: Introductionmentioning

confidence: 99%

Particle Image Velocimetry and Finite Volume Method Study of Bi-leaflet Artificial Heart Valve

Bakar

Abas

Mokhtar

et al. 2018

JAFM

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The key feature of the bi-leaflet valve is the geometry of the two leaflets, which can be crucial in determining the flow field. In this paper, observations were made on the flow pattern of the blood through the use of bi-leaflet type mechanical prosthetic valve (MHV). Finite volume method (FVM) analysis was conducted using fluidstructure interaction (FSI) method that solved on a dynamic mesh. In terms of the validation, particle image velocimetry (PIV) was used to verify the findings obtained from FVM analysis. The results of velocity and vorticity were the main parameters to be compared. Based on the findings, the results computed for the leaflets motion and the flow field using FVM was found to be in agreement with PIV experimental data. The pressure obtained for the simulation is in the range of 10,666-16,000 Pa, which is an ideal and healthy blood pressure level of human. The vorticity was observed to be formed behind the valve with DVI value of 1.275 (simulation) and 1.457 (experiment), lower than the expected range for a normal DVI in mitral valve. The maximum shear stress achieved (22.5481 Pa) is in the range of platelets activation, which could lead to thrombus formation. The maximum Von Mises stress was found to be at the hinge region of the bi-leaflet valve. These results will serve as a basis for valve design to improve the hemodynamic properties of the heart valve.

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