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Research Papers: Evaporation, Boiling, and Condensation

A Comparative Study of Flow Boiling in a Microchannel With Piranha Pin Fins

[+] Author and Article Information
X. Yu

Mechanical, Aerospace, and Nuclear
Engineering Department,
Rensselaer Polytechnic Institute,
110 8th Street,
Troy, NY 12180
e-mail: yux2@rpi.edu

C. Woodcock

Mechanical, Aerospace,
and Nuclear Engineering Department,
Rensselaer Polytechnic Institute,
110 8th Street,
Troy, NY 12180
e-mail: woodcc@rpi.edu

Y. Wang

Department of Mechanical
and Aerospace Engineering,
University of Central Florida,
Orlando, FL 32816
e-mail: Yingying.Wang@ucf.edu

J. Plawsky

Chemical Engineering Department,
Rensselaer Polytechnic Institute,
110 8th Street,
Troy, NY 12180
e-mail: plawsky@rpi.edu

Y. Peles

Department of Mechanical
and Aerospace Engineering,
University of Central Florida,
Orlando, FL 32816
e-mail: Yoav.Peles@ucf.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received July 20, 2015; final manuscript received May 27, 2016; published online June 28, 2016. Assoc. Editor: Ali Khounsary.

J. Heat Transfer 138(11), 111502 (Jun 28, 2016) (12 pages) Paper No: HT-15-1486; doi: 10.1115/1.4033743 History: Received July 20, 2015; Revised May 27, 2016

In this paper, we report on the recent development of an advanced microscale heat sink, termed as piranha pin fin (PPF). A 200 μm deep microchannel embedded with PPFs was fabricated and tested. Fluid flow and heat transfer performance were evaluated with HFE7000 as the working fluid. The surface temperature, pressure drop, heat transfer coefficient, and critical heat flux (CHF) conditions were experimentally obtained and discussed. A 676 W/cm2 CHF was achieved based on the heater area and at an inlet mass flux of 2460 kg/m2 s. Microchannels with different PPF configurations were investigated and studied for different flow conditions. It was found that a microchannel with PPFs can dissipate high heat fluxes with reasonable pressure drops. Flow conditions and PPF configuration played important roles for both fluid flow and heat transfer performances. These studies extended knowledge and provided useful reference for further PPF design in microchannel for flow boiling.

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Figures

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Fig. 7

Heat loss calibration (heat flux is based on the heater area only)

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Fig. 6

Heater calibration for device #1 (PPF's mouth opening of 70 μm) and device #2 (PPF's mouth opening of 90 μm)

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Fig. 5

Schematic diagram of the experimental system

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Fig. 4

Designed dimensions for single device and PPFs: (a) a single device dimension, (b) PPFs' dimension, (c) single PPF of device #1, and (d) single PPF of device #2

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Fig. 3

Process flow for microfabrication

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Fig. 2

Schematic images for a single microchannel device: (a) a full device, (b) silicon piece with etched microchannel and pressure ports, and (c) flow patch in microchannel

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Fig. 10

Heat transfer coefficient versus heat flux for open flow: (a) device #1 (PPF's mouth opening of 70 μm) and (b) device #2 (PPF's mouth opening of 90 μm)

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Fig. 11

Heat flux versus surface temperature Tw for extraction-only flow: (a) device #1, Pref = 240 kPa; (b) device #1, Pref = 377 kPa;(c) device #2, Pref = 240 kPa; and (d) device #2, Pref = 377 kPa

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Fig. 12

Pressure drop versus heat flux for extraction-only flow: (a) device #1 (PPF's mouth opening = 0.07 mm) and (b) device #2 (PPF's mouth opening = 0.09 mm)

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Fig. 13

Heat transfer coefficient versus heat flux for extraction-only flow: (a) device #1 and (b) device #2

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Fig. 8

Flow boiling visualization for single PPF: (a) position of the single PPF (this PPF is located in the middle of the last array), (b) onset of boiling for device #2 at a single PPF (q″ = 160 W/cm2, Gin = 948 kg/m2 s, and Pref = 240 kPa), and (c) developing flow boiling for device #2 at a single PPF (q″ = 180 W/cm2, Gin = 948 kg/m2 s, and Pref = 240 kPa)

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Fig. 9

Base heat flux versus average surface temperature Tw under open flow condition for device #1(PPF's mouth opening of 70 μm) and device #2 (PPF's mouth opening of 90 μm): (a) device #1, Pref = 240 kPa; (b) device #1, Pref = 377 kPa; (c) device #2, Pref = 240 kPa; and (d) device #2, Pref = 377 kPa

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Fig. 14

Exit quality for extraction-only flow: (a) device #1 and (b) device #2

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Fig. 15

Ratio of CHF with open flow and CHF with extraction-only flow

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Fig. 1

Schematic of a microchannel with PPFs: (a) PPFs conceptual design and (b) silicon-based microchannel with PPFs (half of the channel)

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