Heat Transfer Behavior in a Square Duct with Tandem Wire Coil Element Insert

Chinese Journal of Chemical Engineering ›› 2012, Vol. 20 ›› Issue (5): 863-869.

Heat Transfer Behavior in a Square Duct with Tandem Wire Coil Element Insert

Smith Eiamsa-ard¹, Narin Koolnapadol², Pongjet Promvonge²

1. Department of Mechanical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand;
2. Department of Mechanical Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand

收稿日期:2011-05-16 修回日期:2011-09-25 出版日期:2012-10-28 发布日期:2012-11-06
通讯作者: Pongjet Promvonge,E-mail:kppongje@kmitl.ac.th

Heat Transfer Behavior in a Square Duct with Tandem Wire Coil Element Insert

Smith Eiamsa-ard¹, Narin Koolnapadol², Pongjet Promvonge²

1. Department of Mechanical Engineering, Faculty of Engineering, Mahanakorn University of Technology, Bangkok 10530, Thailand;
2. Department of Mechanical Engineering, Faculty of Engineering, King Mongkut's Institute of Technology Ladkrabang, Bangkok 10520, Thailand

Received:2011-05-16 Revised:2011-09-25 Online:2012-10-28 Published:2012-11-06

摘要/Abstract

摘要： Effects of insertion of tandem wire coil elements used as turbulator on heat transfer and turbulent flow friction characteristics in a uniform heat-flux square duct are experimentally investigated in this work. The experiment is conducted for turbulent flow with the Reynolds number from 4000 to 25000. The wire coil element is inserted into the duct with a view to generating a swirl flow that assists to wash up the flow trapped in the duct corners and then increase the heat transfer rate of the test duct. Apart from the full-length coil, 1D and 2D length coil elements placed in tandem inside the duct with various free-space lengths are introduced to reduce the friction loss. The results obtained from these wire coil element inserts are also compared with those from the smooth duct. The experimental results reveal that the use of wire coil inserts for the full-length coil, 1D and 2D coil elements with a short free-space length leads to a considerable increase in heat transfer and friction loss over the smooth duct with no insert. The full-length wire coil provides higher heat transfer and friction factor than the tandem wire coil elements under the same operating conditions. Also, performance evaluation criteria to assess the real benefits in using the wire coil insert into the square duct are determined.

关键词: heat transfer, wire coil insert, square duct, turbulator

Abstract: Effects of insertion of tandem wire coil elements used as turbulator on heat transfer and turbulent flow friction characteristics in a uniform heat-flux square duct are experimentally investigated in this work. The experiment is conducted for turbulent flow with the Reynolds number from 4000 to 25000. The wire coil element is inserted into the duct with a view to generating a swirl flow that assists to wash up the flow trapped in the duct corners and then increase the heat transfer rate of the test duct. Apart from the full-length coil, 1D and 2D length coil elements placed in tandem inside the duct with various free-space lengths are introduced to reduce the friction loss. The results obtained from these wire coil element inserts are also compared with those from the smooth duct. The experimental results reveal that the use of wire coil inserts for the full-length coil, 1D and 2D coil elements with a short free-space length leads to a considerable increase in heat transfer and friction loss over the smooth duct with no insert. The full-length wire coil provides higher heat transfer and friction factor than the tandem wire coil elements under the same operating conditions. Also, performance evaluation criteria to assess the real benefits in using the wire coil insert into the square duct are determined.

Key words: heat transfer, wire coil insert, square duct, turbulator

Smith Eiamsa-ard, Narin Koolnapadol, Pongjet Promvonge. Heat Transfer Behavior in a Square Duct with Tandem Wire Coil Element Insert[J]. Chinese Journal of Chemical Engineering, 2012, 20(5): 863-869.

Smith Eiamsa-ard, Narin Koolnapadol, Pongjet Promvonge. Heat Transfer Behavior in a Square Duct with Tandem Wire Coil Element Insert[J]. Chin.J.Chem.Eng., 2012, 20(5): 863-869.

参考文献

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Heat Transfer Behavior in a Square Duct with Tandem Wire Coil Element Insert

Heat Transfer Behavior in a Square Duct with Tandem Wire Coil Element Insert

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