The idea of nano-technology started in 1959. It has been used in different applications since its creation. One of its new areas of applications is in medicine. From medical instruments (i.e. sensors etc) to medical treatments nano-technology is playing a major role. Application of nano-robot inside human blood for health purposes is a promising area. The purpose of this study is to investigate the flow field and heat transfer modeling of a nano-robot inside the biggest human vein, Aorta. In our formulation of governing nonlinear partial differential equations, momentum and energy equations are applied to the blood and the nano-robot. The equations are solved by a computational fluid dynamic code. The velocity profile, pressure and temperature distribution of the nano-robot in direction of the blood stream as well as in opposite direction of the blood stream are calculated. Results are verified with a known experimental condition. Results show that the nano-robot does not disturb the blood stream significantly. Therefore it is safe to use such devices inside blood stream for medical purposes.

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