Modeling whirling motion and heat transfer intensification in a heated tube with a twin twisted tape

This submitted paper, states numerical discussion for heat transfer augmentation in a heated circular tube by using the combined twin twisted tape and nano fluid. Al2o3-water is adopted as the nano fluid .The whirling motion is tested with clockwise and counter twin twisting tape. The investigation has been conducted for Reynolds number range from 5000 to 35000 while the twist ratio has the values 2,4 and 6 respectively. Two values of nano fluid volume concentration is examined as 0.5% and 4% respectively. The research is aim to promote the heat transfer enhancement by means of the combined mechanism of twin twisted tape and nano fluid. A FLUENT ANSYS 17 commercial code is used for problem designing, formulation and getting the results. The obtained results show that the twin twist is most active than the single twist for heat transmit improvement. This increase is enhanced as the volume concentration increases. In addition, a counter clockwise twisting tape offered better thermal performance than clockwise twisting. The numerical consequence revealed that, the Nusselt number, friction factor, and overall performance factor increase as twist ratio decreases .