The cause and development of many cardiovascular diseases are related to the nature of blood flow and the mechanical behaviour of the blood vessel. Moreover, the plaque (stenosis) rapture can be occurred as a result of interaction between the blood and plaque, leading to the clot formation and stroke. In the present study, the interaction of blood flow with plaque (stenosis) was numerically modelled. A pulsatile flow was used to mimic the real blood flow through the artery. The rheological properties of blood are considered as Newtonian as well as non-Newtonian. Fibrous cap thickness was varied from 0.1 mm to 2.0 mm. Many vortex rings are appeared at the pre-and post-stenotic region in the Newtonian model than in the non-Newtonian model. Deformation of stenosis, wall shear stress (WSS) and vomises stress all are found high in non-Newtonian model for the fibrous cap thicknesses studied here. Moreover, in Newtonian model, the vonmises stress was found to be 6500 pa for the case of 50% stenosis with 0.1mm fibrous cap thickness on the other hand it was around 10500 pa in case of non-Newtonian model.

No abstract

The effect of a direct-current field on the temperature distribution in a thin, non-uniform functionally graded metal line subjected to distributed local heat sources is investigated. The material properties of the metal line are assumed to vary over the span following a linear functional relationship. Bump-like heat sources of different profiles are considered to simulate the condition of distributed local heating of the metal line. The governing differential equations associated with the electrical and thermal problems are derived in terms of variable thermal and electrical conductivity of the material. The solution of the coupled boundary-value problem is then obtained using a finite-difference computational scheme. The temperature distributions in the FGM line are determined for different environmental conditions as a function of intensity of the DC field.

No abstract

No abstract