Performance and Evaluation of Analytical Research on Heat Transfer of Laminar Flow in a Circular Tube Fitted with the Twisted Tape Trapezoidal Cut

Abstract

Heat exchangers can be found in a number of applications ranging from engineering devices to household consumer appliances. For heat exchangers, it is important they should offer a good heat transfer performance apart from saving energy. Heat transfer enhancement techniques help to save energy and cool hot components in the design of electronic and mechanical circuits. However, enhancement in heat transfer takes place at the cost of a bearable increase in friction losses and pressure drop. Therefore, miniature heat exchanger systems and the cost of energy motivate industries to use energy-saving methods in their design. With aging, the most common problem in heat exchangers is the reduction in heat transfer rate. Numerous studies have proved that placing a disturbance in the path of fluid flow can help to increase the heat transfer rate in the case of worn-out heat exchangers. For decades, researchers are numerically investigating the effects of different types of tape inserts to enhance heat transfer operation in heat exchangers. Through the large number of papers reviewed by us, we came across a number of designs of twisted tape inserts where earlier researchers have performed experiments by using tape inserts of different materials, varying twist ratios, different angles of attack, varying pitch ratios, varying cuts, etc and have successfully achieved an improvement in heat transfer rate. As heat exchangers form the backbone of many industrial processes, the idea of saving energy with the design of cost-effective tape insert motivated us to work on this area of research. The aim of this research is to review the findings of earlier researchers in this area and to utilize the knowledge for improving the heat transfer rate of conventional tubes in our future work. newline