Effects of in-line deflectors on the overall performance of a channel heat exchanger

The turbulent convective thermal transfer in channel heat exchangers (CHEs) is studied numerically via the CFD (Computational Fluid Dynamics) method. Deflectors are inserted on hot bottom walls of to enhance hydrothermal characteristics. Various shapes in-line deflectors considered, namely: rectangular (a/b = 0.00), cascaded rectangular-triangular 0.25, 0.50, and 0.75), triangular 1.00) shapes. From obtained results, inclusion with a/b 0.75 has given most significant enhancement factor, which was higher than that for 0.00, 1.00 by about 5.36, 5.06, 67.27, 3.88%, respectively. Also, deflector’ case 0.75) shows an increase factor (η) from 4 15.44% over cases one deflector (corrugated, rectangular, triangular, trapezoidal, arc, (+), S, 45° V, W, T, Γ, ε-shaped) or two (staggered corrugated). This highlights effectiveness improving performance proposed exchanger conditions adopted.