Research Papers

Heat Transfer Performance of Internal Cooling Channel With Single-Row Jet Impingement Array by Varying Flow Rates

[+] Author and Article Information
Sin Chien Siw, Nicholas Miller, Minking Chyu

Department of Mechanical Engineering,
University of Pittsburgh,
Pittsburgh, PA 15261

Maryanne Alvin

National Energy Technology Laboratory,
Pittsburgh, PA 15236

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received November 4, 2013; final manuscript received August 21, 2016; published online November 16, 2016. Assoc. Editor: Ting Wang.

J. Thermal Sci. Eng. Appl 9(1), 011015 (Nov 16, 2016) (10 pages) Paper No: TSEA-13-1183; doi: 10.1115/1.4034686 History: Received November 04, 2013; Revised August 21, 2016

The current detailed experimental study focuses on the optimization of heat transfer performance through jet impingement by varying the coolant flow rate to each individual jet. The test section consists of an array of jets, each jet individually fed and metered separately, that expel coolant into the channel and exit through one end. The diameter D, height-to-diameter H/D, and jet spacing-to-diameter S/D are all held constant at 9.53 mm, 2, and 4, respectively. Upon defining the optimum flow rate for each jet, varying diameter jet plates are designed and tested using a similar test setup with the addition of a plenum. Two test cases are conducted by varying the jet diameter within 10% compared to the benchmark jet diameter, 9.53 mm. The Reynolds number, which is based on hydraulic diameter of the channel and total mass flow rate entering the channel, ranges from approximately 52,000 up to 78,000. The transient liquid crystal technique is employed in this study to determine the local and average heat transfer coefficient distributions on the target plate. Commercially available computational fluid dynamics software, ansys cfx, is used to qualitatively correlate the experimental results and to fully understand the flow field distributions within the channel. The results revealed that varying the jet flow rates, total flow varied by approximately ±5% from that of the baseline case, the heat transfer enhancement on the target surface is enhanced up to approximately 35%. However, when transitioning to the varying diameter jet plate, this significant enhancement is suppressed due to the nature of flow distribution from the plenum, combined with the complicated crossflow effects.

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Fig. 1

Double-walled cooling concept [14]

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Fig. 2

Three-dimensional schematic of the varying flow rate test channel

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Fig. 3

Top and side views of the varying flow rate test channel

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Fig. 4

Three-dimensional representation of the jet issuing plate with varying jet diameter and plenum

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Fig. 5

The layout of test setup in this study

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Fig. 6

Schematic of one-dimensional transient heat transfer model

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Fig. 7

Mesh domain in the computational study

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Fig. 8

Local heat transfer coefficient of test cases summarized in Table 1

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Fig. 9

Spanwise-averaged heat transfer for the baseline, test 1, test 2, and test 3 cases

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Fig. 10

Spanwise-averaged heat transfer for the baseline, test 4, test 5, and test 6 cases

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Fig. 11

Total heat transfer enhancement normalized by the fully developed smooth channel

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Fig. 12

Local heat transfer coefficient of the baseline and test cases summarized in Table 2

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Fig. 13

Spanwise-averaged heat transfer of the varying jet diameter cases

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Fig. 14

Spanwise-averaged heat transfer enhancement along the channel

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Fig. 15

Total heat transfer enhancement at varying Re

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Fig. 16

Pressure loss at varying Re

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Fig. 17

Local heat transfer coefficient distribution (varying jet diameter): (a) experimental results and (b) numerical results

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Fig. 18

Total average heat transfer (experimental and numerical data)

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Fig. 19

Streamlines distribution at the vertical plane of the channel: (a) baseline, (b) test 7, and (c) test 8



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