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Research Papers: Flows in Complex Systems

Static Pressure Characteristics in a Pin-Fin Channel With Shaped Cylindrical Pins

[+] Author and Article Information
H. J. Pretorius, G. I. Mahmood, J. P. Meyer

Mechanical and Aeronautical
Engineering Department,
University of Pretoria,
Pretoria 0028, South Africa

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received January 20, 2016; final manuscript received April 3, 2017; published online June 28, 2017. Assoc. Editor: Mark F. Tachie.

J. Fluids Eng 139(9), 091104 (Jun 28, 2017) (5 pages) Paper No: FE-16-1047; doi: 10.1115/1.4036671 History: Received January 20, 2016; Revised April 03, 2017

Standard pin-fins in the heat transfer channels are shaped to reduce the pressure penalty and increase the thermal performance. The paper presents experimental results of the wall-static pressure distributions in an array of modified cylindrical short pin-fins in a channel. Standard cylindrical pin-fins with a smooth surface and a similar array configuration are also evaluated as a baseline for comparisons. The pin-fins with a height to diameter ratio of 1.28 are arranged in a staggered array consisting of 13 rows in a rectangular channel of aspect ratio 1:7.8. The cylindrical pins are modified by the machined slots at the tips. The slots in the pins are aligned in the streamwise direction. The static pressure distributions are measured on the endwall between the pin-rows and on the pin surface. The Reynolds number based on the channel hydraulic diameter ranges from 10,000 to 50,000. The slots in the pins reduce the friction factor and wall-static pressure drop between the pin-rows by up to 50%. The objectives of the investigation are to reduce the pressure penalty in the cylindrical pin-fin channel to provide increased thermal performance.

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Figures

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Fig. 1

Schematic of the experimental setup

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Fig. 2

Configurations of the pin-fin array and the slotted pin with dimensions in mm

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Fig. 3

Pressure coefficient, Cp, along the pin-fin rows for smooth and slotted pins at Re = 10,000

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Fig. 4

Friction factor, f, as dependent upon Re for the pin-fin channel

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Fig. 5

Endwall pressure coefficient, Cp, contours at Re = 10,000 for smooth pins (left) and slotted pins (right) in locations of rows 11–12

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Fig. 6

Averaged spanwise pressure coefficient, Cp,av, on endwall at Re = 10,000–50,000 for smooth pins (left) and slotted pins (right) in locations of rows 11–12. Legends are shown in left plot.

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Fig. 7

Pin-surface normalized pressure distributions, ΔP*, in 11th row at pin-height of H/2 and H/4 for smooth pins (left) and slotted pins (right). Legends are shown in left plot.

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