Experimental and numerical study of turbulent flow and heat transfer inside hexagonal duct

A Comparison of Circular Duct and Real Hexagonal Duct Results Using Hydraulic Diameter

“…7a and 7b, respectively, for a regular hexagonal duct. Results show that the maximum difference between present results and the results of Turgut and Sari [22] for Nusselt number and Darcy friction factor are 2.9% and, 1.9%, respectively. That is, present results are in good agreement with the results of Turgut and Sari [22].…”

“…Fully developed Nusselt number and Darcy friction factor correlations for a regular hexagonal duct, i.e. =60 o , were given by Turgut and Sari [22] for the Reynolds number range 11×10 3 ≤Re≤52×10 3 using standard k-ε turbulence model, respectively, as: To compare the present results with the literature results, fully developed Nusselt number and Darcy friction factor values of present study and the results of Turgut and Sari [22] are shown in Fig. 7a and 7b, respectively, for a regular hexagonal duct.…”

“…Hexagonal-shaped cross-sectional channels are generally encountered in nuclear engineering applications, waste heat recovery, cooling systems of electronic devices and lamella type compact heat exchangers used in many industries such as paper, alcohol, petrochemical and food [3]. Literature review shows that laminar [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] and turbulent [19][20][21][22][23][24][25][26][27][28][29] heat transfer and fluid flow in hexagonal channels are examined by some researchers. Rokni and Gatski [19] predicted turbulent heat transfer and turbulent fluid flow in non-circular channels including rectangular cross-sectional duct with aspect ratio 2.…”

“…A numerical investigation was carried out by Can et al [21] for turbulent flow in hexagonal channels for the Reynolds number of 20,000. Turgut and Sari [22] experimentally and numerically investigated the thermally and hydrodynamically developing turbulent air flow in a regular hexagonal-shaped cross-sectional channel for Reynolds number 2.310 3 Re5310 3 for two different k-omega and three different k- turbulence models. Turbulent flow and heat transfer in non-circular ducts including equilateral triangle, square, regular hexagon, regular octagon, regular dodecanon were numerically investigated by Wang et al [23] using air as the working fluid for the Reynolds number of 53,477.…”

A Theoretical and Experimental Investigation on Ejector Acoustics and Ejector Silencer Design

“…It is stated that honeycombs help in reducing to-cell size ratio, two honeycombs are placed together giving a length to diameter ratio of 10. The Reynolds number in this honeycomb can be estimated using the formula adapted from reference [102]:…”