Heat transfer experiments in rotating boundary layer flow

Effect of rotation on Goertler vortices in the boundary layer flow on a curved surface

“…The e ect of rotation on Goertler vortices are more pronounced when the values of rotation number is decreased/increased, as compared with zero rotation. Similar observations were also made by Edo et al [5].…”

“…The studies on the Goertler vortices were reviewed by Herbert [1], and Floryan [2]. Only a few studies on the Goertler vortices on a curved surface with the e ect of rotation were discussed by Aouidef et al [3], Zebib and Bottaro [4] and Edo et al [5], etc. The obtained theoretical values are seen two orders of magnitude below the corresponding experimental data.…”

Heat transfer in rotating scale-roughened trapezoidal duct at high rotation numbers

“…The present approach for rig simulation is to increase the hydraulic diameter (d) and reduce the mean flow velocity (W m ) with the coolant mass flow rate unchanged by increasing the pressure of flow inside the rotating test channel. This attempt increases both Ro and Bu at any specified Re that successfully extends the present parametric ranges of rotating flows to a great extent from the past research experiences [7][8][9][10][11][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] as indicated in Table 1. However, the maximum Re and Ro listed in Table 1 are not simultaneously attainable.…”

“…A large amount of laboratory-scale heat transfer experiments using simplified models of the real blade cooling geometry that examine their heat transfer performances in the rotating channels with various enhancement techniques is well documented. The geometries of enhanced rotating channels relevant to their cooling performances such as the type of surface enhancements, channel orientation, wall heating condition, channel cross-sectional shapes and multi-pass connections have been examined at various test conditions [10,[18][19][20][21][22][23][24][25][26][27][28][29][30] but only a few of these studies emulate the real engine conditions by operating the high pressure tests [10,19,22,29,30]. These experimental studies [10,[18][19][20][21][22][23][24][25][26][27][28][29][30] have agreed that the Reynolds (Re) and rotation (Ro) numbers characterize the forced convection and the Coriolis forces in their own rights with the buoyancy impact to be indexed by density ratio (Dq/q).…”

“…This buoyancy number can physically reflect the relative strength of rotating buoyancy force and is derived from the momentum equation based on the Boussinesq approximation [22]. Methods of heat transfer augmentation for rotating channels involve surface ribs [10,[18][19][20][21][22][23][24]30], array of longitudinal humps [25], pin-fins [26], dimples [27] and impingement [28,29]. In our previous study [31], the characteristics of heat transfer and pressure drop in a static narrow rectangular channel roughened by deepened scales were examined.…”