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Research Papers: Forced Convection

The Heat Transfer Characteristics of Rolling Wheel and the Characteristic Length Determining Them

[+] Author and Article Information
Liangbi Wang

School of Mechatronic Engineering,
Lanzhou Jiaotong University,
Lanzhou, Gansu 730070, China;
Key Laboratory of Railway Vehicle Thermal
Engineering,
Ministry of Education of China,
Lanzhou Jiaotong University,
Lanzhou, Gansu 730070, China
e-mail: lbwang@mail.lzjtu.cn

Yongheng Zhang, Yuan Wu, Zhihui Yin

School of Mechatronic Engineering,
Lanzhou Jiaotong University,
Lanzhou, Gansu 730070, China;
Key Laboratory of Railway Vehicle Thermal
Engineering,
Ministry of Education of China,
Lanzhou Jiaotong University,
Lanzhou, Gansu 730070, China

Qiuwang Wang

Key Laboratory of Thermo-Fluid Science
and Engineering,
Ministry of Education,
School of Energy and Power Engineering,
Xi'an Jiaotong University,
Xi'an, Shaanxi 710049, China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received June 26, 2014; final manuscript received December 20, 2015; published online March 1, 2016. Assoc. Editor: Sujoy Kumar Saha.

J. Heat Transfer 138(5), 051705 (Mar 01, 2016) (11 pages) Paper No: HT-14-1427; doi: 10.1115/1.4032607 History: Received June 26, 2014; Revised December 20, 2015

The convective heat transfer characteristics on the surface of a rolling wheel are investigated using the naphthalene sublimation technique. Five sizes of rolling wheel are selected in the experiments. The local and average Nusselt numbers are obtained. The results reveal that if the wheel radius is used as the characteristic length, the relationship between Nusselt number and Reynolds number is dependent on the wheel radius. This indicates that the wheel radius is not the characteristic length to determine the dimensionless convective heat transfer characteristics of the rolling wheel. Thus, a newly defined characteristic length is provided. For different radii of the wheel, the relationships between Nusselt number and Reynolds number based on this length collapse into one reasonable correlation. The correlation not only enriches the insight of convective heat transfer on rolling wheel but also extends the applicability of the present experimental data.

Copyright © 2016 by ASME
Topics: Wheels , Heat transfer
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References

Figures

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Fig. 5

The test wheel to obtain the local Nu on the tread

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Fig. 4

The test wheel after casting naphthalene to obtain the local Nu on the side surface

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Fig. 3

The test wheel after casting naphthalene to obtain the average Num

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Fig. 2

Schematic views of the experimental apparatus

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Fig. 1

A rolling wheel running at speed u (a) and a rotating wheel running at speed ω in a air stream with velocity u (b)

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Fig. 7

Local Nusselt number on the side surface and tread of two different test wheels: (a) side surfaces, R = 18 mm; (b) side surfaces, R = 38 mm; and (c) tread, R = 28 mm

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Fig. 8

Local Nusselt number on the side surface and tread on four measured lines having different orientations at the same Re: (a) side surface, R = 38 mm; (b) side surface, R = 28 mm; and (c) tread, R = 18 mm

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Fig. 6

The measured lines on the test wheel

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Fig. 9

The distribution of Nulocal,s or Nulocal,t averaged on four measured lines: (a) side surface, R = 23 mm; (b) side surface, R = 28 mm; and (c) tread, R = 33 mm

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Fig. 10

The plate near the tread of the test wheel

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Fig. 11

The average Nusselt numbers: (a) averaged on total wheel surface, (b) averaged on side surface only, and (c) averaged on the tread only

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Fig. 15

The ratio of local Nusselt number to average Nusselt number on the side surface

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Fig. 12

The comparison of the results of the present work with other results

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Fig. 13

The region to determine the volume of the main flow and area of the solid wall affecting fluid flow

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Fig. 14

The average Nusselt numbers using the newly defined characteristic length: (a) averaged on total surface, (b) averaged on the side surface, and (c) averaged on the tread

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