Distribution of the heat transfer coefficient in a channel with periodic transverse grooves

Thermal characteristics of turbulent rib-grooved channel flows

“…In the past studies, the rib-grooved roughness surface has been used as a turbulator to break-down the viscous sublayer and to reduce the thermal boundary layer thickness or thermal resistance near the rib-groove turbulator [2]. Reviews of the heat transfer coefficient and pressure loss for various rib-groove turbulator configurations on both experimental and computational works have been examined by many researches [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18]. Layek et al [1] studied the heat transfer coefficient and friction factor in rectangular ducts with repeated transverse integral chamfered rib-grooved roughness on one broad wall at various groove position to pitch ratios.…”

“…Distributions of the heat transfer coefficient and of the pressure drop along the wall inside an asymmetrically grooved rectangular duct were measured for thermally developing and periodic turbulent flow by Lorenz et al [7]. Nishimura et al [8] examined the fluid mixing and mass transfer with a high Schmidt number in grooved rectangular ducts with different cavity lengths.…”

Thermal and hydraulic characteristics of turbulent nanofluids flow in a rib–groove channel

“…The highest Nusselt number was obtained for (p/e = 10), while the maximum values of friction coefficients were obtained for (p/e = 7 and p/e = 9), respectively, for rectangular and square ribs. Lorenz et al [25] presented experimentally the distributions of the heat transfer coefficient and the pressure drop along the wall inside an asymmetrically ribbed channel at 10 4 ≤ Re ≤ l0 5 . The Nusselt number distribution indicates a secondary transverse vortex in the corner between the bottom of the groove and the front flank of the rib but none at the opposite corner of the groove.…”

Heat Transfer Enhancement and Pressure Drop of Grooved Annulus of Double Pipe Heat Exchanger

“…Many investigations have been done to improve the flow characteristics and friction around grooves [2][3][4][5][6][7][8][9]. In past years, most researches focused on rectangular grooves [10][11][12][13][14][15][16]. Also studies on various shapes of grooves has been done to improve the flow and flow structure details [17][18][19][20].…”