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Research Papers: Micro/Nanoscale Heat Transfer

Effects of Microribs on the Thermal Behavior of Transcritical n-Decane in Asymmetric Heated Rectangular Mini-Channels Under Near Critical Pressure

[+] Author and Article Information
Xin Li

School of Energy Science and Engineering,
Harbin Institute of Technology,
No. 92, West Da-Zhi Street,
Harbin 150001, China
e-mail: xinli_1007@hit.edu.cn

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

Silong Zhang

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

Naigang Cui

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

Wen Bao

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

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received April 27, 2018; final manuscript received July 17, 2018; published online September 5, 2018. Assoc. Editor: Guihua Tang.

J. Heat Transfer 140(12), 122402 (Sep 05, 2018) (15 pages) Paper No: HT-18-1272; doi: 10.1115/1.4041049 History: Received April 27, 2018; Revised July 17, 2018

Microrib is a very promising heat transfer enhancement method for the design of scramjet regenerative cooling channels. In this paper, a three-dimensional numerical model has been built and validated to parametrically investigate the thermal behavior of transcritical n-Decane in mini cooling channels with microribs under near critical pressure. The results have shown that the height and pitch of microrib perform a nonmonotonic effect on the convective heat transfer coefficient of n-Decane inside the cooling channel and the optimal microrib parameters stay at low values due to dramatic changes of coolant thermophysical properties in the near critical region. Due to severe thermal stratification and near critical conditions, there will be a significant recirculation zone in vertical direction near microrib, and its interaction with the strong secondary flow in axial direction caused by limited channel width of mini-channel will largely enhance the local convective heat transfer and its downstream region. Besides, the dramatically changing thermophysical properties of n-Decane will lead to a locally remarkable heat transfer enhancement phenomenon similar to impingement cooling at the front edge of microribs.

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Figures

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Fig. 4

Comparison of temperature from numerical calculation and experiment

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Fig. 3

Comparison of Nusselt numbers along the channel centerline between seventh and eighth row at Re = 8000 between experimental data from Ref. [36] and results from our numerical model and Ref. [37]

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Fig. 2

Symmetric model of the regenerative cooling channel with solid domain

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Fig. 1

The regenerative cooling channel of scramjet engine

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Fig. 8

Wall temperature along the flow direction of smooth channel and microribbed channel

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Fig. 9

Heat transfer coefficient along the flow direction of smooth channel and microribbed channel

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Fig. 10

Temperature of fluid in the heated section of smooth channel and microribbed channel

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Fig. 5

The mesh of microrib in the vicinity of interface

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Fig. 6

Cross section of mesh with different grid number

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Fig. 7

Convergence results of different grid number in fluid domain

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Fig. 21

Heat transfer coefficient along the flow direction of channels with h = 0.432 mm, 0.576 mm

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Fig. 22

Fluid temperatures in the heated section of different microrib heights channels

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Fig. 11

Typical flow structures of the cooling channel with microribs

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Fig. 12

Local temperature of fluid in the microribbed channel

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Fig. 13

Local heat flux in the microribbed channel (y = 232–238 mm)

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Fig. 14

Local turbulent kinetic energy in the microribbed channel (y = 232–238 mm)

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Fig. 15

Streamlines at different distances to the side wall

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Fig. 16

Streamlines of different slices in the vicinity of microrib (z = 0–0.4 mm)

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Fig. 17

Streamlines at different heights of a microrib unit

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Fig. 18

Velocity at different distances to the side wall (x, 233.9, 0) ∼ (x, 233.9, 1.44)

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Fig. 19

Wall temperatures of heated section in different height channel

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Fig. 20

Heat transfer coefficient along the flow direction of channels with h = 0.144 mm, 0.288 mm

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Fig. 23

Streamlines of cooling channels with different microrib heights

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Fig. 24

The dimensionless friction number of cooling channels

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Fig. 30

Heat transfer coefficient of heated section in different p/e channels

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Fig. 31

Dimensionless friction number of cooling channels

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Fig. 32

Dimensionless Nusselt number of cooling channels

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Fig. 33

Dimensionless integrated heat transfer factor of cooling channels

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Fig. 25

The dimensionless Nusselt number of cooling channels

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Fig. 26

The dimensionless integrated heat transfer factor of cooling channels

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Fig. 27

Schematic diagram of local heat transfer coefficients

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Fig. 28

Schematic diagram of z-velocity in relevant areas

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Fig. 29

Fluid temperature in the center of channels with different microrib pitches

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