Viscous liquids can be encountered in many applications of micro devices. In this paper, an experimental and numerical simulation of a micro screw concentric tube heat exchanger is presented to determine the overall heat transfer coefficient and the amount of heat created by friction. The screw surface area and the increase in the viscosity of the liquid can raise the amount of heat created by friction and subsequently increase the amount of heat transferred in the micro concentric tube heat exchanger. Increasing the viscosity of the source can increase the overall heat transfer coefficient. The micro heat exchanger consists of a tube inside the screw placed inside a micro-channel. When the screw rotates, a net force is transferred to the fluid due to differential pressure on the depth of the thread and pressure gradient along the screw axis, thus causing the fluid to displace outside and inside the screw. A micro-screw heat exchanger was designed to maximize heat transfer from a liquid (viscous) in the cylinder to water in a tube inside a screw. Three-dimensional simulation of micro-screw heat exchanger was performed. The results obtained from CFD simulation have been compared with the experiments.