Heat transfer from a rotating disk in a parallel air crossflow

Experimental study of the convective heat transfer from a rotating disc subjected to forced air streams

“…Such a qualitative behaviour has been predicted recently by the LES study [10] although the absolute heat transfer values have been found to be too low in comparison to the experimental data. For laminar flow regimes, the critical ratio has been obtained to Re u /Re u ¼ 1.4 by the LES study [10] and it has been discussed within the framework of the Landau model for flow instabilities [27]. The present experimental data are supporting this theoretical consideration.…”

“…6 for the experimentally determined mean Nusselt number Nu against crossflow Reynolds number Re u . The agreement between the data and the turbulent Schlichting correlation (10) is quite excellent for great Reynolds numbers, whereas the LES results [10] are underestimating the heat transfer significantly. The present data are also in good agreement with the results measured by Dennis et al [7] and with the corresponding empirical relation Nu ¼ 0:00588Re 0:925 u for Pr ¼ 0:72 (11) derived from the naphthalene sublimation experiments from He et al [4,9].…”

“…A numerical integration gives 1 ffiffi ffi R p R þR ÀR dy LðyÞ ¼ 2:01502 and hence the correlation (9). A similar procedure yields to the turbulent heat transfer correlation (10).…”

“…He et al [9] have employed in 2005 the naphthalene sublimation technique for obtaining the local Sherwood number of a rotating disc for a limited range of a local Reynolds number, but unfortunately they have not made a distinction between the rotational and the crossflow Reynolds numbers. Recently, aus der Wiesche has presented results of an extensive large-eddy-simulation (LES) study [10]. His numerically data have indicated much lower heat transfer coefficients as measured experimentally by Dennis et al [7].…”

Numerical study of the flow inside an alternator: application to the thermal optimization of the machine

“…To solve this problem, at each contact between a fluid cell and a solid cell, the code considers a simpler and more theoretical geometry. For example, for the flow parallel to the rotor, a correlation giving h for a parallel flow on a rotating disk (Wiesche [7]) is used.…”