Numerical predictions of flow and thermal fields in an enclosure with two periodically moving walls

Chin-Hsiang Cheng, Kuo Shu Hung

Research output: Contribution to journalArticle

Abstract

Numerical predictions of transient flow and thermal fields in a rectangular enclosure with two periodically moving vertical walls are presented. The combined influence of the movement of the walls and the buoyancy as well on the flow pattern and heat transfer performance is evaluated. The compressible-flow model is adopted, and governing equations are expressed in integral form and discretized on the moving grids, which deform in resonance with the walls to accommodate the variation in the volume of the enclosure. A two-stage pressure-correction scheme is applied for simultaneously determining the distributions of absolute pressure, density, temperature, and velocity of the compressible flow field in the enclosure during the periodically stable periods. Effects of the frequency, stroke, and the phase angle of the wall oscillations on the flow are of major concerns in this study. The frequency is ranged between 5 and 25 Hz and the dimensionless strokes (l/H) of the wall are varied from 0.4 to 1.0. Results for Nusselt numbers on the walls as well as the dimensionless input work required to excite the wall oscillation are provided.

Original languageEnglish
Pages (from-to)353-369
Number of pages17
JournalInternational Journal for Numerical Methods in Fluids
Volume53
Issue number3
DOIs
Publication statusPublished - 2007 Jan 30

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Enclosure
Enclosures
Compressible flow
Compressible Flow
Stroke
Dimensionless
Prediction
Oscillation
Moving Grid
Pressure Correction
Transient Flow
Integral form
Nusselt number
Buoyancy
Flow Pattern
Flow patterns
Flow Field
Heat Transfer
Governing equation
Flow fields

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Mechanics of Materials
  • Mechanical Engineering
  • Computer Science Applications
  • Applied Mathematics

Cite this

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abstract = "Numerical predictions of transient flow and thermal fields in a rectangular enclosure with two periodically moving vertical walls are presented. The combined influence of the movement of the walls and the buoyancy as well on the flow pattern and heat transfer performance is evaluated. The compressible-flow model is adopted, and governing equations are expressed in integral form and discretized on the moving grids, which deform in resonance with the walls to accommodate the variation in the volume of the enclosure. A two-stage pressure-correction scheme is applied for simultaneously determining the distributions of absolute pressure, density, temperature, and velocity of the compressible flow field in the enclosure during the periodically stable periods. Effects of the frequency, stroke, and the phase angle of the wall oscillations on the flow are of major concerns in this study. The frequency is ranged between 5 and 25 Hz and the dimensionless strokes (l/H) of the wall are varied from 0.4 to 1.0. Results for Nusselt numbers on the walls as well as the dimensionless input work required to excite the wall oscillation are provided.",
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Numerical predictions of flow and thermal fields in an enclosure with two periodically moving walls. / Cheng, Chin-Hsiang; Hung, Kuo Shu.

In: International Journal for Numerical Methods in Fluids, Vol. 53, No. 3, 30.01.2007, p. 353-369.

Research output: Contribution to journalArticle

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