Influences of variation in geometry of tape insert on thermal performance and flow characteristics in tubes

This paper presents the results of the numerical investigation carried out on different tube designs to assess the impacts of variations in the geometry of the twisted tape on heat transfer, friction factor and thermal performance of water inside the tubes. Alternate-axis triangular cut twisted tape was considered and its pitch and width, as well as the perimeter of the cuts on it were varied. The walls of the tubes were subjected to a uniform heat flux condition. The results of the investigation revealed that the thermal performance of the tube designs improved with an increase in the width of the tape and an increase in the size of the cuts on the tape but diminished as the pitch of the tape increases