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Research Papers: Heat Exchangers

Investigation of Vortex Generator Enhanced Double-Fin and Tube Heat Exchanger

[+] Author and Article Information
Shobhana Singh

Department of Energy Technology,
Aalborg University,
Pontoppidanstræde 111,
Aalborg East 9220, Denmark
e-mail: ssi@et.aau.dk

Kim Sørensen

Department of Energy Technology,
Aalborg University,
Pontoppidanstræde 111,
Aalborg East 9220, Denmark

Thomas Condra

Department of Energy Technology,
Aalborg University,
Pontoppidanstræde 111,
Aalborg East 9220, Denmark

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received March 23, 2018; final manuscript received November 7, 2018; published online December 13, 2018. Assoc. Editor: Danesh K. Tafti.

J. Heat Transfer 141(2), 021802 (Dec 13, 2018) (13 pages) Paper No: HT-18-1172; doi: 10.1115/1.4042050 History: Received March 23, 2018; Revised November 07, 2018

In the present work, a numerical analysis of conjugate heat transfer and fluid flow in vortex generator (VG) enhanced double-fin and tube heat exchanger is carried out. The enhanced design aims to improve the heat transfer performance of a conventional double-fin and tube heat exchanger for waste heat recovery applications. A three-dimensional (3D) numerical model is developed using ANSYS cfx to simulate fluid flow and conjugate heat transfer process. Numerical simulations with rectangular winglet vortex generators (RWVGs) at five different angles of attack (20degα20deg) are performed for the Reynolds number range of 5000Re11,000. Salient performance characteristics are analyzed in addition to the temperature distribution and flow fields. Based on the numerical results, it is concluded that the overall performance of the double-fin and tube heat exchanger can be improved by 27–91% by employing RWVGs at α=20deg for the range of Reynolds number investigated. The study provides useful design information and necessary performance data that can be adopted for the design development of the heat exchanger at a lower manufacturing cost.

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Figures

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Fig. 1

A pictorial view of double-fin and tube heat exchanger

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Fig. 2

Illustration of the conventional double-fin and tube heat exchanger unit: (a) conventional plain fin and (b) enhanced fin with RWVG

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Fig. 3

Geometric details of the enhanced double-fin and tube heat exchanger design: (a) RWVG punched on the horizontal fin surface and (b) enhanced double-fin and tube heat exchanger with RWVGs

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Fig. 4

Simulated computational geometry with set boundary conditions

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Fig. 5

Illustration of the boundary layer mesh

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Fig. 6

A plot of Nusselt number versus number of mesh elements

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Fig. 7

The comparison of model results with the correlation values

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Fig. 8

Temperature distribution on the lower fin and tube surface: (a) plain fin with no RWVG, (b) fin with RWVG at α = 0 deg, (c) fin with RWVG at α = 10 deg, (d) fin with RWVG at α = 20 deg, (e) fin with RWVG at α = −10 deg, and (f) fin with RWVG at α = −20 deg

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Fig. 9

Velocity streamlines starting from the leading edge of the winglet of first pair inside the fluid domain at Re=5000: (a) fin with RWVG at α = 0 deg, (b) fin with RWVG at α = 10 deg, (c) fin with RWVG at α = 20 deg, (d) fin with RWVG at α = −10 deg, and (e) fin with RWVG at α = −20 deg

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Fig. 10

Velocity streamlines at Re = 5000 on the outlet plane (x=0.15 m) of the fluid domain: (a) plain fin with no RWVG, (b) fin with RWVG at α = 0 deg, (c) fin with RWVG at α = 10 deg, (d) fin with RWVG at α = 20 deg, (e) fin with RWVG at α = −10 deg, and (f) fin with RWVG at α = −20 deg

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Fig. 11

Variation of average synergy angle with the angle of attack and Reynolds number

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Fig. 12

Variation in heat transfer characteristics with the angle of attack and Reynolds number: (a) Nusselt number and (b) Colburn j factor

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Fig. 13

Variation in pressure loss characteristics with the angle of attack and Reynolds number: (a) Euler number and (b)friction factor

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Fig. 14

Variation of the normalized volume goodness factor with the angle of attack and Reynolds number: (a) Euler number and (b) friction factor

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