期刊
APPLIED THERMAL ENGINEERING
卷 52, 期 1, 页码 69-76出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2012.11.028
关键词
Heat transfer; Friction factor; Rotor-assembled strand; Thermal performance factor
资金
- National Nature Science Foundation of Beijing [3102023]
- National Science and Technology Support Plan Project [2011BAA04B02]
The article presents an experimental study of turbulent heat transfer and flow characteristics in a circular tube equipped with single spiral slot rotor (SSR)-assembled strand, single low flow resistance rotor (LFR)assembled strand and rotor-assembled strands mixed by spiral slot rotor (SSR) and low flow resistance rotor (LFR). Five different mixed-rotor-assembled strands are tested in the current work; they included the mixed-rotor-assemble strand with three different number ratios, Y = 2, 1 and 0.5, and three total numbers, H = 3, 6 and 9, of rotors in each group at Y = 2. The obtained results reveal that mixed-rotor-assembled strand with number ratio, Y = 2, yields higher mean thermal performance factor than those with other number ratios, Y = 1 and 0.5 around 2.83% and 1.64%, respectively and the thermal performance factor decreases with increasing total number (H) of rotors in each group when number ratio is at a constant value Y = 2. (c) 2012 Elsevier Ltd. All rights reserved.
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