0
Research Papers: Forced Convection

Numerical Study of Turbulent Flow and Convective Heat Transfer Characteristics in Helical Rectangular Ducts

[+] Author and Article Information
Yunfei Xing

State Key Laboratory
of High Temperature Gas Dynamics,
Institute of Mechanics,
Chinese Academy of Sciences,
Beijing 100190, China
e-mail: xingyunfei@imech.ac.cn

Fengquan Zhong

State Key Laboratory
of High Temperature Gas Dynamics,
Institute of Mechanics,
Chinese Academy of Sciences,
Beijing 100190, China
e-mail: fzhong@imech.ac.cn

Xinyu Zhang

State Key Laboratory
of High Temperature Gas Dynamics,
Institute of Mechanics,
Chinese Academy of Sciences,
Beijing 100190, China
e-mail: changxy@imech.ac.cn

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 23, 2014; final manuscript received September 11, 2014; published online September 30, 2014. Assoc. Editor: Ali Khounsary.

J. Heat Transfer 136(12), 121701 (Sep 30, 2014) (6 pages) Paper No: HT-14-1036; doi: 10.1115/1.4028583 History: Received January 23, 2014; Revised September 11, 2014

Three-dimensional turbulent forced convective heat transfer and its flow characteristics in helical rectangular ducts are simulated using SST k–ω turbulence model. The velocity field and temperature field at different axial locations along the axial direction are analyzed for different inlet Reynolds numbers, different curvatures, and torsions. The causes of heat transfer differences between the inner and outer wall of the helical rectangular ducts are discussed as well as the differences between helical and straight duct. A secondary flow is generated due to the centrifugal effect between the inner and outer walls. For the present study, the flow and thermal field become periodic after the first turn. It is found that Reynolds number can enhance the overall heat transfer. Instead, torsion and curvature change the overall heat transfer slightly. But the aspect ratio of the rectangular cross section can significantly affect heat transfer coefficient.

FIGURES IN THIS ARTICLE
<>
Copyright © 2014 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

Schematic diagram of a helical rectangular duct

Grahic Jump Location
Fig. 2

Development of velocity field in varied cross sections along the axial direction (δ=0.192, λ=0.11, and Re = 55,000)

Grahic Jump Location
Fig. 3

Distribution of streamlines at varied cross sections (δ=0.192, λ=0.11, and Re = 55,000)

Grahic Jump Location
Fig. 4

Development of temperature field along the axial direction (δ=0.192, λ=0.11, and Re = 55,000)

Grahic Jump Location
Fig. 5

Development of turbulence intensities distribution along the axial direction (δ=0.192, λ=0.11, and Re = 55,000)

Grahic Jump Location
Fig. 6

Distribution of averaged heat transfer coefficients on the inner and outer walls (δ=0.192, λ=0.11, and Re = 55000)

Grahic Jump Location
Fig. 7

Development of Nusselt numbers on the inner walls (δ=0.192 and λ=0.11)

Grahic Jump Location
Fig. 8

Distribution of one-turn averaged heat transfer coefficients on the inner and outer walls of helical duct with two pitches (δ=0.192 and Re = 55,000)

Grahic Jump Location
Fig. 9

Distribution of one-turn averaged heat transfer coefficients on the inner and outer walls of helical duct with two curvatures (λ = 0.11 and Re = 55,000)

Grahic Jump Location
Fig. 10

The cross section of ducts (unit: mm)

Grahic Jump Location
Fig. 11

Comparison of averaged heat transfer coefficients on the inner and outer walls for different duct configurations (Re = 55,000)

Grahic Jump Location
Fig. 12

The heat transfer coefficient distribution on the inner wall (Re = 55,000)

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In