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rest of your computer, and only the site that created the cookie can read it.Chinese Journal of Mechanical Engineering
JME-in English
CJME-in Chinese
→→&Effects
of Longitudinal Pitch on Heat Transfer and Flow Resistance
Characteristics of Serrated Spiral-finned-tube Banks
Effects of Longitudinal Pitch on Heat Transfer and Flow Resistance
Characteristics of Serrated
Spiral-finned-tube Banks
MA Youfu& YUAN Yichao& LIU Yuzheng& HU Xiaohong
(College of Energy and Power Engineering, University of Shanghai for
Science and Technology,
Shanghai 200093)
Abstract: Developed from the solid spiral-finned-tube, the serrated
spiral-finned-tube has wide application prospects in large-scale
heat-exchange facility due to its advantages such as easy manufacture,
high fin ratio, high heat transfer coefficient and fin efficiency. In
order to get known the effects of tube layout structures on heat
transfer and flow resistance characteristics of serrated
spiral-finned-tube banks (SSB), nine SSB with staggered layouts in terms
of various transverse pitch (S1) and longitudinal pitch (S2) of tube
banks are tested after an analysis of its influencing mechanism.
Accordingly, the effects of S2 on heat transfer and flow resistance
characteristics of SSB are obtained, and the corresponding correlations
are put forward. The experimental results show that with the same Re
number of fin-side and relative transverse pitch (S1/do), the Eu number
decrease with the increasing of S2, while there is an optimum relative
longitudinal pitch (S2/do) to make Nu number and comprehensive heat
transfer performance index j/f (ratio of Colburn heat transfer factor
and friction factor) of fin-side reach a maximum associated with a
certain S1/ on the premise of same Re number and S1/do, the
appropriate selection of S2/do can make Nu number increase about 6% and
Eu number decreases slightly in the test range of S2/do= 2.41～3.07, and
the j/f index can increase about 7%.
Key words: Heat transfer enhancement HRSG Serrated spiral-finned-tube
Heat transfer characteristic
Flow resistance characteristic
CLC No: TK223
Received , received in revised form 　
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