Heat transfer of a radially rotating furrowed channel with two opposite skewed sinusoidal wavy walls

Thermal performance of rotating two-pass ribbed square channel with wavy sidewalls

“…Inferring the buoyancy mechanisms in the rotating channels from the mixed free convection driven by earth gravity, the buoyancy effects in the rotating ribbed channels with radially outward and inward flows were previously found analogical to the mixed convection in the static channels with counter and parallel flows respectively [1,2,30]. By normalizing the Nu data collected from the rotating surfaces to the similar non-rotating references (Nu 0 ), it is consistently found that the degrees of Bu effects on Nu/Nu 0 ratios are systematically weakened as Ro increases [8,9,11,12,[15][16][17][18][19][20][21][22][27][28][29]; hence ensuring the interdependent Ro and Bu impacts on heat transfer performances in rotating channels.…”

“…A large amount of previous works probed into the thermal performances of various laboratory scale rotating channel flows. Heat transfer performances of the rotating channels enhanced by ribs with square [1][2][3][4][5][6], rectangular [7][8][9], circular [10], trapezoidal [11], parallelogram [12] and triangular [13] shapes and by concave/convex dimples [14,15], pin-fins [16,17], scaled imprints [18] and wavy endwalls [19] were examined. With compound HTE measures, the endwall HTE properties for the rotating channels using V-ribs with scaled imprints [20], angled ribs with dimples [21] and angled rib-lands with pin-fins [22] are recently studied.…”

“…Such isolated Coriolis force effects generate the peripheral heat transfer decays from the unstable toward the stable walls and are reconfirmed by the heat transfer data converted from the mass transfer test results [24] with diminished buoyancy interaction. Acting by the Coriolis force effects in isolation by increasing Ro, the heat transfer rates over the unstable wall keep increasing from the stationary channel levels; whereas the stable counterparts are initially reduced from the stationary references but followed by the subsequent heat transfer recoveries after Ro exceeding the critical values [1][2][3][4][5][6][8][9][11][12][15][16][17][18][19][20][21][22]. As the near-wall flow structures are considerably affected by the presence of the various types of HTE devices, the Bu impacts on endwall Nu vary with the thermal boundary conditions [25] and the HTE devices [26].…”

Numerical Analysis of Flow Field and Heat Transfer of 2D Wavy Ducts and Optimization by Entropy Generation Minimization Method

“…Kuhn and Rohr [25] employed digital particle image velocimetry and planar laser-induced fluorescence techniques to examine the spatial variation of the streamwise and normal velocity components at the heated wavy surface. Chang et al [26,27] studied the heat transfer and pressure drop in furrowed channels with transverse sinusoidal wavy walls. Pham et al [28] have been using large eddy simulation with dynamic modeling to investigate three-dimensional turbulent flow in wavy channels.…”