Nusselt numbers in a rectangular channel with heating on the floor only

V. Keyhani, R. N. Christensen, F. A. Kulacki

Research output: Contribution to journalConference articlepeer-review

Abstract

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 languageEnglish (US)
Pages (from-to)155-167
Number of pages13
JournalAmerican Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD
Volume96
StatePublished - Dec 1 1988
EventASME Proceedings of the 1988 National Heat Transfer Conference - Houston, TX, USA
Duration: Jul 24 1988Jul 27 1988

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