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Research Papers: Heat and Mass Transfer

The Research of Temperature Fields in the Proximity of a Bundle of Heated Pipes Arranged Above Each Other

[+] Author and Article Information
Jozef Cernecky

Professor
Faculty of Environmental and Manufacturing Technology,
Technical University in Zvolen,
Studentska 26,
Zvolen 960 53, Slovakia
e-mail: cernecky@tuzvo.sk

Zuzana Brodnianska

Faculty of Environmental and Manufacturing Technology,
Technical University in Zvolen,
Studentska 26,
Zvolen 960 53, Slovakia
e-mail: zuzana.brodnianska@tuzvo.sk

Przemysław Błasiak

Faculty of Mechanical and Power Engineering,
Wroclaw University of Science and Technology,
Wybrzeże Wyspiańskiego 27,
Wrocław 50-370, Poland
e-mail: przemyslaw.blasiak@pwr.edu.pl

Jan Koniar

Faculty of Environmental and Manufacturing Technology,
Technical University in Zvolen,
Studentska 26,
Zvolen 960 53, Slovakia
e-mail: koniar@tuzvo.sk

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 3, 2016; final manuscript received February 10, 2017; published online April 11, 2017. Assoc. Editor: Dr. Antonio Barletta.

J. Heat Transfer 139(8), 082001 (Apr 11, 2017) (12 pages) Paper No: HT-16-1352; doi: 10.1115/1.4036041 History: Received June 03, 2016; Revised February 10, 2017

The paper deals with the research of temperature fields in the proximity of heated pipes arranged above each other in a natural air convection. The holographic interferometry method was used for the visualization of temperature fields. The experiments were made with pipes, diameter of 20 mm, length 200 mm, spacing two-dimensional (2D) at surface temperatures of 40 °C, 50 °C, and 60 °C, with the vertical arrangement of the pipes as well as with the horizontal shift of their centers by 1/4D and 1/2D (on a surface temperature of 50 °C). Temperature profiles were determined from the experimentally obtained images of temperature fields, and local parameters of heat transfer were calculated. Under the same marginal and geometric conditions, computational fluid dynamics (CFD) simulations of temperature fields were performed as well, while the results (temperature fields, local and mean parameters of heat transfer) were also calculated for various distances between the pipe centers (1D, 2D, and 3D). From the obtained experimental results and CFD simulation results, it is possible to observe the impact of the arrangement and spacing of pipes on heat transfer parameters. The achieved results imply the change in the spacing of the pipes has a greater impact on heat transfer parameters in the bundle of heated pipes located above each other than a moderate horizontal shift of their centers.

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References

Figures

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Fig. 1

The scheme of pipe system arrangement: D, pipe diameter; H, spacing; q, density of heat flow from the pipe (ts > t); g, gravity acceleration; S, horizontal shift of pipe centers

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Fig. 2

The view of the scheme of experimental assembly of heat exchanger pipes: SP, system of pipes located above each other; CT, circular thermostat; EB, extended bundle of laser radiation (the part of the object beam of interferometer); H, spacing; D, pipe diameter; S, horizontal shift of pipe centers; g, gravity acceleration; IA1,2,3, illuminated area; DL, datalogger; TS, temperature sensor; and LW, lateral wall

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Fig. 3

Positions of areas for the determination of local parameters of heat transfer

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Fig. 4

The images of the holographic interferograms of temperature fields around the bottom pipes (H = 2D and S = 0)

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Fig. 5

Quantitative comparison of temperature fields (H = 2D, ts = 50 °C, and Ra = 2.24 × 104). The assignment of temperatures to fringes: 0—22.45 °C, 1—25.95 °C, 2—29.65 °C, 3—33.25 °C, 4—37.25 °C, 5—40.95 °C, and 6—47.85 °C.

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Fig. 6

CFD simulations of temperature fields (°C) in the proximity of variously arranged pipes (ts = 50 °C, H = 2D, and Ra = 2.24 × 104)

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Fig. 7

Qualitative comparison of temperature fields (ts = 50 °C, H = 2D, and Ra = 2.24 × 104)

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Fig. 10

The comparison of the local coefficients of heat transfer hφ obtained from CFD simulations and experiments (H = 2D, S = 0, ts = 60 °C, and Ra = 3.05 × 104)

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Fig. 11

The comparison of the local coefficients of heat transfer hφ obtained from CFD simulations and experiments (H = 2D, S = 1/4D, ts = 50 °C, and Ra = 2.24 × 104)

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Fig. 12

The comparison of the local coefficients of heat transfer hφ obtained from CFD simulations and experiments (H = 2D, S = 1/2D, ts = 50 °C, and Ra = 2.24 × 104)

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Fig. 8

The comparison of the local coefficients of heat transfer hφ obtained from CFD simulations and experiments (H = 2D, S = 0, ts = 40 °C, and Ra = 1.43 × 104)

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Fig. 9

The comparison of the local coefficients of heat transfer hφ obtained from CFD simulations and experiments (H = 2D, S = 0, ts = 50 °C, and Ra = 2.24 × 104)

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Fig. 13

Comparison of Nu numbers with the results for the bottom tube obtained by other authors

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Fig. 14

The local values for the coefficients of heat transfer for ts = 50 °C, H = 2D, S = 0, and Ra = 2.24 × 104

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Fig. 15

The local values for the coefficients of heat transfer for ts = 50 °C, H = 2D, S = 1/4D, and Ra = 2.24 × 104

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Fig. 16

The local values for the coefficients of heat transfer for ts = 50 °C, H = 2D, S = 1/2D, and Ra = 2.24 × 104

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Fig. 17

Local values of heat transfer coefficients for tube I depending on the angle φ (ts = 50 °C, H = 2D, and Ra = 2.24 × 104)

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Fig. 18

Local values of heat transfer coefficients for tube II depending on the angle φ (ts = 50 °C, H = 2D, and Ra = 2.24 × 104)

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Fig. 19

Local values of heat transfer coefficients for tube III depending on the angle φ (ts = 50 °C, H = 2D, and Ra = 2.24 × 104)

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Fig. 20

Local values of heat transfer coefficients for tube IV depending on the angle φ (ts = 50 °C, H = 2D, and Ra = 2.24 × 104)

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Fig. 21

Mean values of Nu numbers (Ra = 2.24 × 104)

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Fig. 22

Mean values of Nu numbers (S = 0D)

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Fig. 23

The image of the holographic interferogram of temperature field (a) the measurement of distance from the surface Δymax and (b) area with the greatest temperature gradient

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