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Research Papers: Micro/Nanoscale Heat Transfer

Flow and Heat Transfer Characteristics of Supercritical Hydrocarbon Fuel in Mini Channels With Dimples

[+] Author and Article Information
Yu Feng

Shenzhen Graduate School,
Harbin Institute of Technology,
University Town of Shenzhen,
Shenzhen 518055, China
e-mail: fengyu85@hit.edu.cn

Jie Cao

School of Energy Science and Engineering,
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: CaoJie_971@163.com

Xin Li

School of Energy Science and Engineering,
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: dandelion_hit@163.com

Silong Zhang

School of Energy Science and Engineering,
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: zslhrb@gmail.com

Jiang Qin

School of Energy Science and Engineering,
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: qinjiang@hit.edu.cn

Yu Rao

Gas Turbine Research Institute,
School of Mechanical Engineering,
Shanghai Jiao Tong University,
Shanghai 200240, China
e-mail: yurao@sjtu.edu.cn

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received November 20, 2016; final manuscript received June 1, 2017; published online August 9, 2017. Assoc. Editor: Debjyoti Banerjee.

J. Heat Transfer 139(12), 122401 (Aug 09, 2017) (11 pages) Paper No: HT-16-1762; doi: 10.1115/1.4037086 History: Received November 20, 2016; Revised June 01, 2017

An idea of using dimples as heat transfer enhancement device in a regenerative cooling passage is proposed to extend the cooling limits for liquid-propellant rocket and scramjet. Numerical studies have been conducted to investigate the flow and heat transfer characteristics of supercritical hydrocarbon fuel in a rectangular cooling channel with dimples applied to the bottom wall. The numerical model is validated through experimental data and accounts for real fuel properties at supercritical pressures. The study shows that the dimples can significantly enhance the convective heat transfer and reduce the heated wall temperature. The average heat transfer rate of the dimpled channel is 1.64 times higher than that of its smooth counterpart while the pressure drop in the dimpled channel is only 1.33 times higher than that of the smooth channel. Furthermore, the thermal stratification in a regenerative cooling channel is alleviated by using dimples. Although heat transfer deterioration of supercritical fluid flow in the trans-critical region cannot be eliminated in the dimpled channel, it can be postponed and greatly weakened. The strong variations of fuel properties are responsible for the local acceleration of fuel and variation of heat transfer performance along the cooling channel.

Copyright © 2017 by ASME
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References

Figures

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Fig. 1

Schematic of cooling channels in a regenerative cooling system

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Fig. 2

Schematic of dimple geometry on the interior bottom wall of the channel

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Fig. 3

Validation of property calculation: (a) density, (b) specific heat capacity, (c) viscosity, and (d) thermal conductivity

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Fig. 4

Comparison between experimental and numerical solved Nusselt number

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Fig. 5

Comparison between experimental and numerical solved friction factor

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Fig. 6

Structured grids near the dimpled surface

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Fig. 7

Schematic of cross-sectional grid for five test cases

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Fig. 8

Convergence history of average temperature and velocity at the outlet for five test cases

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Fig. 9

Temperature distribution at different streamwise locations along the dimpled and smooth channels: (a) dimpled channel and (b) smooth channel

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Fig. 10

Density distribution at different streamwise locations along the dimpled and smooth channels: (a) dimpled channel and (b) smooth channel

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Fig. 11

Thermal conductivity distribution at different streamwise locations along the dimpled and smooth channels: (a) dimpled channel and (b) smooth channel

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Fig. 12

Specific heat capacity distribution at different streamwise locations along the dimpled and smooth channels: (a) dimpled channel and (b) smooth channel

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Fig. 13

Streamlines in the cross-sectional plane (the flow direction is into the paper)

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Fig. 14

Bulk fluid temperature and exterior wall temperature (at the centerline of the heated wall) distribution along the cooling channel

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Fig. 15

Streamwise heat transfer rate along the channel

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Fig. 16

Streamlines in the vicinity of dimples (a) and local heat transfer rate distribution on the dimpled surface (b)

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Fig. 17

Streamwise velocity at vertical line through the dimple center

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