Using subsurface excavations mine drifts as nuclear waste repositories creates a need for knowledge concerning flow transition along the drift and determination of heat transfer coefficients at the surface of the waste respository drift. A typical respository mine drift was modeled by a rectangular channel with variable aspect ratio in which the airflow and heated length in the bottom wall varied independently. Data are presented which qualitatively described the thermal and hydraulic behavior in the entrance region in a rectangular channel. The fully developed total Nusselt number was found to be independent of the Grashof number for the Reynolds range from 44,000 to 150,000. Thus, pure forced convection occurs in the experimental duct. Correlations for the fully developed total Nusselt number for the channel are presented and are functions of the Reynolds number. The average total Nusselt number for the entrance section of the channel is a function of the Reynolds number and heated length.
|Original language||English (US)|
|Number of pages||13|
|Journal||American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD|
|State||Published - Dec 1 1988|
|Event||ASME Proceedings of the 1988 National Heat Transfer Conference - Houston, TX, USA|
Duration: Jul 24 1988 → Jul 27 1988