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RESEARCH PAPERS: SPECIAL ISSUE ON BOILING AND INTERFACIAL PHENOMENA: Forced Convection

Effects of Intersection Angles on Flow and Heat Transfer in Corrugated-Undulated Channels With Sinusoidal Waves

[+] Author and Article Information
Jixiang Yin1

School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P. R. C.yjxiangwise@hotmail.com

Guojun Li, Zhenping Feng

School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, P. R. C.

1

Corresponding author. Also at: Taiyuan University of Technology.

J. Heat Transfer 128(8), 819-828 (Jan 07, 2006) (10 pages) doi:10.1115/1.2222378 History: Received May 23, 2005; Revised January 07, 2006

This paper reported three-dimensional numerical simulations of the steady laminar flow and heat transfer in corrugated-undulated channels with sinusoidal waves, aiming to investigate the effects of intersection angles (θ) between corrugated and undulated plate and Reynolds number (Re) on the flow and heat transfer. The simulations are conducted by using multi-channel computational domain for three different geometries. The code is validated against experimental results and then data for Nusselt number (Nu) and friction factor (f) are presented in a Re range of 1001500, and intersection angle range of 30150deg. The simulation confirms the changes of Nuu (averaged over undulated plate) and Nuc (averaged over corrugated plate) with θ representing different characteristics. As θ increases, Nu (Nuu or Nuc) is about 2–16 times higher for the corrugated-undulated configurations CP-UH1 and CP-UP1 and the concomitant f is about 4–100 higher, when compared to a straight channel having square cross section. The minimum of local Nu ( Nuu or Nuc ) is situated at the four contact points where the top plate touches the bottom one, and the high Nu is located upstream of the crest of the conjugate duct. Performance evaluation for the CP-UH1 channel shows that the goodness factors (G) are larger than 1 with the straight channel having a square cross section as a reference, and the 30deg geometry channel has optimal flow area goodness.

Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Crossed-corrugated geometry (see Ref. 3)

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Figure 2

Corrugated-undulated geometry (see Ref. 3)

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Figure 3

Geometry of corrugated-undulated (CU) heat transfer element. (a) End view of element pack; (b) cross section and planform of undulated plate; (c) cross and planform of corrugated plate.

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Figure 4

Computational domain sketch

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Figure 5

Unitary cell (perspective view)

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Figure 6

Three-dimensional grid of adjacent channels along main flow direction

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Figure 7

Main geometrical quantities sketch

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Figure 8

Comparison between predicted and experimental results. (a) Average Nusselt number, (b) Fanning friction factor.

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Figure 9

(a) Average Nu in the main flow direction consecutive cell of corrugated plates; (b) average Nu in the main flow direction consecutive cell of undulated plates

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Figure 10

Flow patterns in crossed-corrugated channel. (a) Moderate included angle; (b) Large included angle (see Ref. 5).

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Figure 11

Average Nusselt number on the undulated (Nuu) and corrugated (Nuc) plate as a function of the Re for different intersection angles and geometries

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Figure 12

Average Nu on undulated (Nuu) and corrugated (Nuc) plates of UCS geometry as a function of the intersection angle for different Reynolds numbers

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Figure 13

Distribution of the local Nusselt number for the CP-UCS with intersection angle 60deg, 120deg and Re=500

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Figure 14

Temperature contour distributions of midplane for CP-UH1, intersection angle 60deg, 120deg and Re=1200

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Figure 15

Predicted velocity vector for the CP-UH1 inlet surface, intersection angle θ=120deg, Re=1500. (a) Corrugation channel, (b) undulation channel.

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Figure 16

Fanning friction factor as a function of Re for different intersection angles and geometries

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Figure 17

Variation of f with intersection angle in the UCS channel for different Reynolds numbers

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Figure 18

Goodness factor G over Reynolds number with different intersection angles for CP-UH1

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Figure 19

The area goodness factor variation with intersection angles for CP-UH1

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