Thermal Performance of a Tube Equipped with V-nozzle Turbulator Inserts

This study pertains to the numerical investigation of the influence of V-nozzle turbulators on thermal performance in a circular tube under uniform heat flux condition. The converging-diverging nozzles as a venturi structure were located in the test tube in order to generate turbulance/reverseflow. The computations were carried out by consideration of various pitch ratios, PR = 2, 4, and 6 for Reynolds numbers between 5000 and 32000, using air as a working fluid. The variation of Nusselt number (Nu) and friction factor (f) versus Reynolds number (Re) were introduced for the obtained numerical results. The plain tube results were compared with the works available in literature for confirmation of the used numerical method. Consequently, the results demonstrated that the usage of V-nozzles at smaller pitch ratio yielded an increase in heat transfer rate and pressure loss