Liquid microjets are emerging as candidate primary or secondary heat exchangers for the thermal management of next generation photonic integrated circuits (PICs). However, the thermal and hydrodynamic behavior of confined, low Reynolds number liquid slot jets is not yet comprehensively understood. This investigation experimentally examined jet outlet modifications—in the form of tabs and chevrons—as techniques for passive control and enhancement of single-phase convective heat transfer. The investigation was carried out for slot jets in the laminar flow regime, with a Reynolds number range, based on the slot jet hydraulic diameter, of 100–500. A slot jet with an aspect ratio of 4 and a fixed confinement height to hydraulic diameter ratio (H/Dh) of 1 was considered. The local surface heat transfer and velocity field characteristics were measured using infrared (IR) thermography and particle image velocimetry (PIV) techniques. It was found that increases in area-averaged Nusselt number of up to 29% compared to the baseline case could be achieved without incurring additional hydrodynamic losses. It was also determined that the location and magnitude of Nusselt number and velocity peaks within the slot jet stagnation region could be passively controlled and enhanced through the application of outlet tabs of varying geometries and locations.
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Passive Control and Enhancement of Low Reynolds Number Slot Jets Through the Use of Tabs and Chevrons
Andrew Sexton,
Andrew Sexton
CONNECT,
Stokes Laboratories,
Bernal Institute,
University of Limerick,
Limerick V94 T9PX, Ireland
e-mail: andrew.sexton@ul.ie
Stokes Laboratories,
Bernal Institute,
University of Limerick,
Limerick V94 T9PX, Ireland
e-mail: andrew.sexton@ul.ie
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Jeff Punch,
Jeff Punch
CONNECT,
Stokes Laboratories,
Bernal Institute,
University of Limerick,
Limerick V94 T9PX, Ireland
Stokes Laboratories,
Bernal Institute,
University of Limerick,
Limerick V94 T9PX, Ireland
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Jason Stafford,
Jason Stafford
Thermal Management Research Group,
Nokia Bell Labs,
Dublin D15 Y6NT, Ireland
Nokia Bell Labs,
Dublin D15 Y6NT, Ireland
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Nicholas Jeffers
Nicholas Jeffers
Thermal Management Research Group,
Nokia Bell Labs,
Dublin D15 Y6NT, Ireland
Nokia Bell Labs,
Dublin D15 Y6NT, Ireland
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Andrew Sexton
CONNECT,
Stokes Laboratories,
Bernal Institute,
University of Limerick,
Limerick V94 T9PX, Ireland
e-mail: andrew.sexton@ul.ie
Stokes Laboratories,
Bernal Institute,
University of Limerick,
Limerick V94 T9PX, Ireland
e-mail: andrew.sexton@ul.ie
Jeff Punch
CONNECT,
Stokes Laboratories,
Bernal Institute,
University of Limerick,
Limerick V94 T9PX, Ireland
Stokes Laboratories,
Bernal Institute,
University of Limerick,
Limerick V94 T9PX, Ireland
Jason Stafford
Thermal Management Research Group,
Nokia Bell Labs,
Dublin D15 Y6NT, Ireland
Nokia Bell Labs,
Dublin D15 Y6NT, Ireland
Nicholas Jeffers
Thermal Management Research Group,
Nokia Bell Labs,
Dublin D15 Y6NT, Ireland
Nokia Bell Labs,
Dublin D15 Y6NT, Ireland
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received February 22, 2017; final manuscript received July 10, 2017; published online October 10, 2017. Assoc. Editor: Danesh K. Tafti.
J. Heat Transfer. Mar 2018, 140(3): 032201 (12 pages)
Published Online: October 10, 2017
Article history
Received:
February 22, 2017
Revised:
July 10, 2017
Citation
Sexton, A., Punch, J., Stafford, J., and Jeffers, N. (October 10, 2017). "Passive Control and Enhancement of Low Reynolds Number Slot Jets Through the Use of Tabs and Chevrons." ASME. J. Heat Transfer. March 2018; 140(3): 032201. https://doi.org/10.1115/1.4037786
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