Comparison of Correction Factors for Shell-and-Tube Heat Exchangers with Segmental or Helical Baffles
作者:
P. STEHLÍK,
J. NĚMČANSKÝ,
D. KRAL,
L. W. SWANSON,
期刊:
Heat Transfer Engineering
(Taylor Available online 1994)
卷期:
Volume 15,
issue 1
页码: 55-65
ISSN:0145-7632
年代: 1994
DOI:10.1080/01457639408939818
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Heat transfer and pressure drop correction factors based on the Bell-Delaware method have been compared for an optimized segmental baffle heat exchanger and a helical baffle heat exchanger. In general, the results showed that properly designed helical baffles offer a significant improvement in heat transfer while providing a reduced exchanger pressure drop. The enhancement in heat transfer for helical baffles was reflected by the so-called turbulence enhancement correction factor, which accounted for the increase in heat transfer observed at a critical baffle inclination angle of 25°. As the baffle inclination angle was increased beyond this critical angle, the turbulence enhancement factor continued to increase and eventually produced a maximum heal transfer enhancement of 1.39 times that for ideal cross-flow conditions. The reduction in pressure drop due to the helical baffles was found to vary from 0.26 to 0.60 depending on the helical inclination angle.
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