Journal
APPLIED THERMAL ENGINEERING
Volume 132, Issue -, Pages 30-37Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2017.12.049
Keywords
Plate-fin heat sink; Cross-fin heat sink; Natural convection; Heat transfer enhancement
Funding
- National Key R&D Program of China [2016YFC0205600]
- National Natural Science Foundation of China [51676156, 51206128]
- National 111 Project of China [B06024]
- Postdoctoral Science Foundation of China [2016M590942]
- Shaanxi Province Science Foundation
- Fundamental Research Funds for the Central Universities of China
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A novel cross-fin heat sink consisting of a series of long fins and a series of perpendicularly arranged short fins was proposed to enhance natural convective heat transfer. The design principle of the cross-fin heat sink was based on overcoming internal thermal fluid-flow defects in a conventional plate-fin heat sink. The thermal performance of the proposed heat sink was compared with a reference plate-fin heat sink in horizontal orientation. A numerical model considering both natural convection and radiation heat transfer was developed to obtain thermal fluid-flow distributions and heat transfer coefficients of both the cross- and plate-fin heat sinks. Corresponding experiments were performed to validate the model predictions. It was demonstrated that, compared to the reference plate-fin heat sink, the cross-fin heat sink enhanced the overall (including natural convection and radiation) and convective (excluding radiation) heat transfer coefficients by 11% and 15%, respectively. Importantly, the enhancement was achieved without increasing the overall volume, material consumption, and too much extra cost. The proposed cross-fin heat sink provides a practical alternative to the widely adopted plate-fin heat sinks. (C) 2017 Elsevier Ltd. All rights reserved.
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