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Content Provider | The American Society of Mechanical Engineers (ASME) Digital Collection |
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Author | Jenn-Jiang Hwang Tong-Miin Liou |
Copyright Year | 1995 |
Abstract | Experiments are conducted to study the turbulent heat transfer and friction in a low-aspect-ratio rectangular channel in which two opposite walls are roughened by perforated ribs. The perforated ribs are arranged in a staggered manner. Effects of perforated rib open-area ratio (β = 10, 22, 38, 44, and 50 percent), rib pitch-to-height ratio (PR = 5, 10, 15, and 20), rib height-to-channel hydraulic diameter ratio (H/De = 0.063 and 0.081), rib alignment (staggered and symmetric), and Reynolds number (10,000 ≤ Re ≤ 50,000) are examined. It is found that approximately the same heat transfer enhancement and pressure drop penalty are obtained between symmetric and staggered rib arrangements. A permeability criterion is proposed by tracing heat transfer coefficient distributions, which compares well with previous flow-visualization results. Results also show that ribs with β = 44 percent give the best thermal performance under either the constant friction power or the constant flow rate constraint. Roughness functions for friction and heat transfer are further developed in terms of rib and flow parameters. |
Starting Page | 843 |
Ending Page | 850 |
Page Count | 8 |
File Format | |
ISSN | 00221481 |
e-ISSN | 15288943 |
Journal | Journal of Heat Transfer |
Volume Number | 117 |
Issue Number | 4 |
DOI | 10.1115/1.2836300 |
Language | English |
Publisher | The American Society of Mechanical Engineers |
Publisher Date | 1995-11-01 |
Access Restriction | Subscribed |
Subject Keyword | Channels (Hydraulic engineering) Flow (Dynamics) Flow visualization Friction Functions Heat transfer Heat transfer coefficients Permeability Pressure drop Reynolds number Surface roughness Turbulent heat transfer |
Content Type | Text |
Resource Type | Article |
Subject | Mechanical Engineering Mechanics of Materials Condensed Matter Physics Materials Science |
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