0
RESEARCH PAPERS: Heat Exchangers

Air Flow and Heat Transfer in Louver-Fin Round-Tube Heat Exchangers

[+] Author and Article Information
H. L. Wu1

 Advanced Heat Transfer LLC, 1715 Aaron Brenner Drive, Suite 726, Memphis, TN 38120hailingwu̱02@yahoo.com

Y. Gong, X. Zhu

 Advanced Heat Transfer LLC, 1715 Aaron Brenner Drive, Suite 726, Memphis, TN 38120

1

Corresponding author.

J. Heat Transfer 129(2), 200-210 (May 21, 2006) (11 pages) doi:10.1115/1.2402180 History: Received September 09, 2005; Revised May 21, 2006

Experimental investigations were conducted to understand the air flow and heat transfer in louver-fin round-tube two-row two-pass cross-counterflow heat exchangers. The Colburn factor j and friction factor f were obtained by using the ε-NTU approach. A three-dimensional computational fluid dynamics model was developed based on a representative unit cell with periodical and symmetric boundary conditions. Analysis of tube-side circuiting effect has been conducted and showed improvement by applying overall nonlinear tube-side fluid temperature boundary conditions. Comparison of heat transfer rate of the first and second rows showed that the first row was much more effective, achieving 6853% of the total heat transfer rate, when air velocity changes from 1.02msto2.54ms. A dimensionless parameter, F, was introduced to describe the louver interaction for different fin designs with various louver angles. Using jf13 as a criterion to evaluate the heat transfer and pressure loss performance, an optimal F was predicted around 0.62.

FIGURES IN THIS ARTICLE
<>
Copyright © 2007 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Experimental facility: (a) sketch 3map of the test facility; and (b) circuiting

Grahic Jump Location
Figure 2

Fin configurations: (a) core section; (b) isometric view; and (c) side view

Grahic Jump Location
Figure 4

The Colburn factor j and friction factor f versus Reo

Grahic Jump Location
Figure 5

Computational domain and grids: (a) computational domain (top view); and (b) fin geometry and periodical boundary; and (c) meshes near louver corners

Grahic Jump Location
Figure 6

Water temperature profiles along the circuit: (a) circuiting; and (b) water temperature profiles

Grahic Jump Location
Figure 7

Top views of streamlines released from line MN in the midplane between two fins (Note: higher uin produces recirculation loop): (a) case 1, uin=1.017m∕s; and (b) case 7, uin=2.542m∕s

Grahic Jump Location
Figure 8

Contours of heat flux and wall temperature: (a) heat flux; and (b) wall temperature

Grahic Jump Location
Figure 11

The four fin designs and geometric parameters: (a) Fin A; (b) Fin B; (c) Fin C; (d) Fin D; and (e) geometric relationship.

Grahic Jump Location
Figure 12

Performance of the four fin designs: (a) j′ versus F; (b) f versus F; and (c) j′∕fx(x=1∕3,1) versus F

Grahic Jump Location
Figure 13

Influence of louver interaction on pressure field and streamline pattern: (a) Fin B; and (b) Fin C

Grahic Jump Location
Figure 3

ε-NTU relationships for two-row two-pass cross counterflow heat exchangers

Grahic Jump Location
Figure 10

Profiles of: (a) segment-area-averaged heat flux qw,seg; and (b) segment-area-averaged heat transfer coefficient ho,seg

Grahic Jump Location
Figure 9

Flow pattern through louver fins (Case 1): (a) side view of streamline pattern; and (b) streamlines in representative louver sections (two rows shown)

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