Research of Triangular Baffle Placement Effect on the Heat Transfer and Flow Features in Cross-Triangular Grooved Triangular Channels

In this study, heat transfer performance and fluid flow properties for cross-circular grooved triangular ducts having different location angles and heights of the triangular baffles are numerically searched. The program of Ansys-Fluent is applied to find out the equations of energy and Navier Stokes by employing the turbulence model of k-ε in computational calculations. While the temperature of the inlet of air working fluid is 293 K, values of the wall surface temperature of the lower circular grooved channel are taken as constant 373 K. Triangular baffles have different angles of 30o, 60o and 90o and heights of 0.25H, 0.5H and 0.75H. The range of the Reynolds number employed in this study is 1000-6000. Numerical results agreed with a 3.53% deviation according to empirical work that existed in technical literature. The attained outcomes are presented as mean Nu number, fluid temperature, turbulence kinetic energy, pressure and Performance Evaluation Criterion (PEC) number variations for each triangle baffle angle and height. Distributions of the contour of the temperature, velocity, turbulence kinetic energy and vector of velocity are also evaluated for distinct Re numbers and triangle baffle arrangements. For Re=3000, the Num number in the channel with a 90o baffle angle and 0.75H height is 136.73% higher than that in the channel with 0.25H height, and in the 0.25H baffle height channel, the PEC number is 91.91% higher in the 30o baffle angle condition than in the 90o.