Isolated and coupled effects of rotating and buoyancy number on heat transfer and pressure drop in a rotating two-pass parallelogram channel with transverse ribs

Tong Miin Liou, Shyy-Woei Chang, Yi An Lan, Shu Po Chan

Research output: Contribution to journalArticle

Abstract

Detailed Nusselt number (Nu) distributions over the leading (LE) and trailing (TE) endwalls and the pressure drop coefficients (f) of a rotating transverse-ribbed two-pass parallelogram channel were measured. The impacts of Reynolds (Re), rotation (Ro), and buoyancy (Bu) numbers upon local and regionally averaged Nu over the endwall of two ribbed legs and the turn are explored for Re = 5000-20,000, Ro = 0-0.3, and Bu = 0.0015-0.122. The present work aims to study the combined buoyancy and Coriolis effects on thermal performances as the first attempt. A set of selected experimental data illustrates the isolated and interdependent Ro and Bu influences upon Nu with the impacts of Re and Ro on f disclosed. Moreover, thermal performance factors (TPF) for the tested channel are evaluated and compared with those collected from the channels with different cross-sectional shapes and endwall configurations to enlighten the relative heat transfer efficiency under rotating condition. Empirical Nu and f correlations are acquired to govern the entire Nu and f data generated. These correlations allow one to evaluate both isolated and combined Re, Ro and/or Bu impacts upon the thermal performances of the present rotating channel for internal cooling of gas turbine blades.

Original languageEnglish
Article number032001
JournalJournal of Heat Transfer
Volume140
Issue number3
DOIs
Publication statusPublished - 2018 Mar 1

Fingerprint

parallelograms
pressure drop
Buoyancy
buoyancy
Pressure drop
heat transfer
Heat transfer
Nusselt number
Turbomachine blades
Coriolis effect
Gas turbines
turbine blades
gas turbines
Cooling
Hot Temperature
cooling

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

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abstract = "Detailed Nusselt number (Nu) distributions over the leading (LE) and trailing (TE) endwalls and the pressure drop coefficients (f) of a rotating transverse-ribbed two-pass parallelogram channel were measured. The impacts of Reynolds (Re), rotation (Ro), and buoyancy (Bu) numbers upon local and regionally averaged Nu over the endwall of two ribbed legs and the turn are explored for Re = 5000-20,000, Ro = 0-0.3, and Bu = 0.0015-0.122. The present work aims to study the combined buoyancy and Coriolis effects on thermal performances as the first attempt. A set of selected experimental data illustrates the isolated and interdependent Ro and Bu influences upon Nu with the impacts of Re and Ro on f disclosed. Moreover, thermal performance factors (TPF) for the tested channel are evaluated and compared with those collected from the channels with different cross-sectional shapes and endwall configurations to enlighten the relative heat transfer efficiency under rotating condition. Empirical Nu and f correlations are acquired to govern the entire Nu and f data generated. These correlations allow one to evaluate both isolated and combined Re, Ro and/or Bu impacts upon the thermal performances of the present rotating channel for internal cooling of gas turbine blades.",
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Isolated and coupled effects of rotating and buoyancy number on heat transfer and pressure drop in a rotating two-pass parallelogram channel with transverse ribs. / Liou, Tong Miin; Chang, Shyy-Woei; Lan, Yi An; Chan, Shu Po.

In: Journal of Heat Transfer, Vol. 140, No. 3, 032001, 01.03.2018.

Research output: Contribution to journalArticle

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