Heat transfer and pressure drop in two-pass rib-roughened square channels with bleed from sharp bend

Shyy-Woei Chang, Zong Xian Cai

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

This experimental study investigates the heat transfer, pressure drop and thermal performance factor for the two-pass rib-roughened channel with and without bleed from its sharp bend. Detailed distributions of Nusselt number (Nu) and dimensionless wall temperature (η w ) over the rib floor with coolant extractions from three different locations on the outer wall of the sharp bend at 0%, 10%, 20%, 30% of the total airflow rate are comparatively analyzed with 5000 < Re < 25,000. Area-averaged Nu and pressure drop coefficients (f) for the entire two-pass ribbed channel with and without bleed are generated with thermal performance factors (η) compared. The bleed from the outer wall of the sharp bend provides considerable heat transfer enhancements (HTE) over the turning section with substantial reductions in pressure drops; while undermines both Nu and η w performances in the outlet-leg from the no-bleed conditions. Thermal performance factors for the bleed channel at each Re and bleed condition tested are improved from the no-bleed references. Empirical Nu and f correlations are derived for the present two-pass rib-roughened square channel with and without bleed.

Original languageEnglish
Pages (from-to)19-31
Number of pages13
JournalInternational Journal of Heat and Fluid Flow
Volume31
Issue number1
DOIs
Publication statusPublished - 2010 Feb 1

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pressure drop
Pressure drop
heat transfer
Heat transfer
Nusselt number
Coolants
wall temperature
coolants
outlets
Hot Temperature
augmentation
coefficients
Temperature

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

Cite this

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abstract = "This experimental study investigates the heat transfer, pressure drop and thermal performance factor for the two-pass rib-roughened channel with and without bleed from its sharp bend. Detailed distributions of Nusselt number (Nu) and dimensionless wall temperature (η w ) over the rib floor with coolant extractions from three different locations on the outer wall of the sharp bend at 0{\%}, 10{\%}, 20{\%}, 30{\%} of the total airflow rate are comparatively analyzed with 5000 < Re < 25,000. Area-averaged Nu and pressure drop coefficients (f) for the entire two-pass ribbed channel with and without bleed are generated with thermal performance factors (η) compared. The bleed from the outer wall of the sharp bend provides considerable heat transfer enhancements (HTE) over the turning section with substantial reductions in pressure drops; while undermines both Nu and η w performances in the outlet-leg from the no-bleed conditions. Thermal performance factors for the bleed channel at each Re and bleed condition tested are improved from the no-bleed references. Empirical Nu and f correlations are derived for the present two-pass rib-roughened square channel with and without bleed.",
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Heat transfer and pressure drop in two-pass rib-roughened square channels with bleed from sharp bend. / Chang, Shyy-Woei; Cai, Zong Xian.

In: International Journal of Heat and Fluid Flow, Vol. 31, No. 1, 01.02.2010, p. 19-31.

Research output: Contribution to journalArticle

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