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强化传热期刊
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ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.v7.i4.30
pages 247-257

Compound Enhanced Heat Transfer Inside Tubes by Combined Use of Spirally Corrugated Tubes and Inlet Axial Vane Swirlers

Huiying Wu
Shanghai Jiao Tong University, 800 Dong Chuan Rd. Minhang District, Shanghai 200240, China
Huier Cheng
Institute of Engineering Thermophysics, Shanghai Jiaotong University. Shanghai 200030, P.R.China
Q. Zhou
Silsoe Research Institute, Wrest Park, Bedfordshire, U.K.

ABSTRACT

This paper describes an experimental study of single-phase air flow and heat transfer inside a spirally corrugated tube with an inlet axial vane swirler. Three spirally corrugated tubes and six inlet axial vane swirlers are used with different geometry parameters and spiral directions. Results show that the combined use of spirally corrugated tube and inlet axial vane swirler can enhance the convective heat transfer inside a tube, but with the disadvantage of friction factor increase. The compound angle formed by the spirally corrugated tube and the inlet axial vane swirler has a marked influence on the compound enhancement effect. For same conditions, the combination of the spirally corrugated tube with the inlet axial vane swirler in the opposite spiral direction has a higher heat transfer coefficient, a higher friction factor and a higher thermodynamical performance than that in the same spiral direction. The compound thermodynamical performance curves are also presented. It is showed that with the same pump power and same heat transfer area, the heat flux transferred by the spirally corrugated tube with an inlet axial vane swirler can be increased up to 1.9 times, compared to the smooth-tube values. Finally, a new method is proposed for correlating the compound friction and heat transfer experimental data.


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