Enhanced heat transfer with swirl duct under rolling and pitching environment

S. W. Chang, Y. Zheng

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

A detailed experimental investigation of heat transfer in a square duct fitted with twisted tape under a rolling and pitching environment is described, with particular reference to the heat transfer augmentation of shipping machinery. This study focuses on the development of an experimental procedure and methods for data processing, the parametric analysis and a selection of measurements that illustrate the manner by which the swinging forces and buoyancy interactively affect the local heat transfer. The swinging Coriolis force and buoyancy influence to a considerable extent the forced convection heat transfer in the swirl duct. Although enhancing the buoyancy level increases the heat transfer as the swirl duct rolls or pitches, the swinging Nusselt number is initially reduced relative to the stationary condition at the weak swinging oscillation, but tends to recover as the swinging force increases. The synergistic effects of harmonic and nonharmonic rolling and pitching oscillations reduce the heat transfer. Hot spots could develop in a swirl duct due to the slow rolling and/or pitching motions if the effect of the swinging oscillations on the heat transfer is not adequately considered. An empirical correlation has been developed for both single-axis and compound swinging conditions which permits the interactive effect of swinging Coriolis and buoyancy forces on forced convection to be quantified and which provides an evaluation of the local heat transfer in a swinging swirl duct.

Original languageEnglish
Pages (from-to)149-166
Number of pages18
JournalJournal of Ship Research
Volume46
Issue number3
Publication statusPublished - 2002 Sep 1

Fingerprint

Ducts
Heat Transfer
Heat transfer
Buoyancy
Forced Convection
Forced convection
Oscillation
Coriolis force
Coriolis Force
Parametric Analysis
Nusselt number
Augmentation
Hot Spot
Freight transportation
Experimental Investigation
Tapes
Machinery
Harmonic
Tend
Motion

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Numerical Analysis
  • Ocean Engineering
  • Mechanical Engineering
  • Applied Mathematics

Cite this

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Enhanced heat transfer with swirl duct under rolling and pitching environment. / Chang, S. W.; Zheng, Y.

In: Journal of Ship Research, Vol. 46, No. 3, 01.09.2002, p. 149-166.

Research output: Contribution to journalArticle

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