Table 1: The literature reviews for numerical investigation with using periodic concept.
 Authors Studied cases TEF Jedsadaratanachai et al. [5] 30° inclined baffle Inline, two opposite walls, square channel BR = 0.2 PR = 0.5–2.5 Re = 100–2000 1.00–9.20 1.00–21.50 3.78 Kwankaomeng and Promvonge [9] 30° inclined baffle  One side, square channel BR = 0.1–0.5 PR = 1.0–2.0 Re = 100–1000 1.00–9.23 1.09–45.31 3.10 Promvonge et al. [3] 30° inclined baffle Inline, two opposite walls, square channel BR = 0.1–0.3 PR = 1.0–2.0 Re = 100–2000 1.20–11.00 2.00–54.00 4.00 Promvonge and Kwankaomeng, [10] 45° V-baffle Staggered, two opposite walls, AR = 2 channel BR = 0.05–0.3 PR = 1.0 Re = 100–1200 1.00–11.00 2.00–90.00 2.75 Promvonge et al. [2] 45° inclined baffle Inline-staggered, two opposite walls,  square channel BR = 0.05–0.3 PR = 1.0 Re = 100–1000 1.50–8.50 2.00–70.00 2.60 Promvonge et al. [4] 45° V-baffle Inline downstream, two opposite walls, square channel BR = 0.1–0.3 PR = 1.0–2.0 Re = 100–2000 1.00–21.00 1.10–225.00 3.80 Boonloi [11] 20° V-baffle Inline downstream-upstream, two opposite walls, square channel BR = 0.1–0.3 PR = 1.0 Re = 100–2000 1.00–13.00 1.00–52.00 4.20 Boonloi and Jedsadaratanachai [12] 30° V-baffle Downstream, one side, square channel BR = 0.1–0.5 PR = 1.0–2.0 Re = 100–1200 1.00–14.49 2.18–313.24 2.44 Jedsadaratanachai and Boonloi [13] 45° discrete-V-baffle Downstream, diagonally, square channel BR = 0.05–0.20 PR = 1.0–1.5 Re = 100–1200 1.40–8.10 2.50–36.00 2.50 Jedsadaratanachai and Boonloi [14] Single twisted tape y/W = 1.0–6.0 Re = 100–2000 1.00–10.00 3.00–44.00 3.51