Influence of radial rotation on heat transfer in a rectangular channel with two opposite walls roughened by hemispherical protrusions at high rotation numbers

Shyy-Woei Chang, Tong Miin Liou, Wei Chun Chen

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9 Citations (Scopus)

Abstract

Detailed heat transfer distributions over two opposite leading and trailing walls roughened by hemispherical protrusions were measured from a rotating rectangular channel at rotation number up to 0.6 to examine the effects of Reynolds (Re), rotation (Ro), and buoyancy (Bu) numbers on local and area-averaged Nusselt numbers (Nu and Nu-) using the infrared thermography. A set of selected heat transfer data illustrates the Coriolis and rotating buoyancy effects on the detailed Nu distributions and the area-averaged heat transfer performances of the rotating channel. The Nu- for the developed flow region on the leading and trailing walls are parametrically analyzed to devise the empirical heat transfer correlations that permit the evaluation of the interdependent and individual Re, Ro, and Bu effect on Nu-.

Original languageEnglish
Article number011010
JournalJournal of Turbomachinery
Volume134
Issue number1
DOIs
Publication statusPublished - 2011 May 26

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Buoyancy
Heat transfer
Nusselt number

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

Cite this

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AU - Chang, Shyy-Woei

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AU - Chen, Wei Chun

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AB - Detailed heat transfer distributions over two opposite leading and trailing walls roughened by hemispherical protrusions were measured from a rotating rectangular channel at rotation number up to 0.6 to examine the effects of Reynolds (Re), rotation (Ro), and buoyancy (Bu) numbers on local and area-averaged Nusselt numbers (Nu and Nu-) using the infrared thermography. A set of selected heat transfer data illustrates the Coriolis and rotating buoyancy effects on the detailed Nu distributions and the area-averaged heat transfer performances of the rotating channel. The Nu- for the developed flow region on the leading and trailing walls are parametrically analyzed to devise the empirical heat transfer correlations that permit the evaluation of the interdependent and individual Re, Ro, and Bu effect on Nu-.

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