The effect of perforation sizes on laminar heat transfer characteristics of an array of perforated fins
- Authors: Shaeri, Mohammad Reza , Jen, Tien-Chien
- Date: 2012
- Subjects: Perforated fins , Heat transfer , Laminar convection
- Type: Article
- Identifier: uj:5285 , http://hdl.handle.net/10210/14954
- Description: Shaeri and Yaghoubi [25] reported the highest heat transfer rate in a laminar flow for a perforated fin with the most perforations (porosity), regardless of investigation on the effects of perforation sizes. In this study, the effects of size and number of perforations on laminar heat transfer characteristics of an array of perforated fins at the highest porosity of the study of Shaeri and Yaghoubi [25] have been numerically investigated. The Navier–Stokes and energy equations are solved by the finite volume procedure using the SIMPLE algorithm. Results show that at a specific porosity, the thermal entrance length of each perforation of a fin with a lower number of perforations is larger than that of each perforation of a fin with a higher number of perforations. Therefore, in a laminar flow and at a constant porosity, a fin with fewer perforations is more efficient to enhance the heat transfer rate compared with a fin with more perforations. Although perforated fins have higher friction drag and lower pressure drag with respect to solid fins, perforated fins do not affect total drag.
- Full Text:
Turbulent heat transfer analysis of a three-dimensional array of perforated fins due to changes in perforation sizes
- Authors: Jen, T.C , Shaeri, Mohammad Reza , Jen, Tien-Chien
- Date: 2012
- Subjects: Heat transfer , Perforated fins
- Type: Article
- Identifier: uj:5261 , ISSN 1040-7782 , http://hdl.handle.net/10210/14930
- Description: Turbulent heat transfer characteristics of three-dimensional and rectangular perforated fins, including perforation like channels along the length of the fins, are investigated. Both dimensions and numbers of perforations are changed at the highest porosity in the study of Shaeri and Yaghoubi [7] to determine the effects of perforation sizes on the heat transfer characteristics of the perforated fins. Results show that at a specific porosity, a fin with a higher number of perforations enhances the heat transfer rate more efficiently. Also, total drag is not only remarkably lower in perforated fins compared with a solid fin, but also becomes smaller by decreasing the number of perforations.
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