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Research Papers

Flow Boiling on Micropin Fins Entrenched Inside a Microchannel—Flow Patterns and Bubble Departure Diameter and Bubble Frequency

[+] Author and Article Information
Santosh Krishnamurthy, Yoav Peles

Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180

J. Heat Transfer 132(4), 041002 (Feb 17, 2010) (9 pages) doi:10.1115/1.2994718 History: Received January 18, 2008; Revised August 12, 2008; Published February 17, 2010; Online February 17, 2010

Flow boiling of HFE 7000 in five parallel microchannels of 222μm hydraulic diameter, each containing a single row of 24 in-line 100μm pin fins, was investigated. High speed photography revealed the dominant flow patterns, namely, the bubbly flow, the multiple flow, and the wavy-annular flow. The interaction of the bubble with the pin fins during nucleate boiling from G=350kg/m2s to G=827kg/m2s and wall heat fluxes from 10W/cm2 to 110W/cm2 is detailed.

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Figures

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Figure 1

Device overview showing the device dimensions

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Figure 2

Schematic of flow patterns

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Figure 3

Wavy-annular flow showing the trailing liquid of the pin fins and vapor cavity on the upstream side of pin fin

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Figure 4

Sequence of images showing the formation of vapor cavity at the stagnation point and subsequent breakage (G=350 kg/m2s, qw″=33.2 W/cm2, and z=4 mm)

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Figure 5

Heat flux as a function of average surface temperature for various mass velocities

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Figure 11

The variation of departure frequency as a function of local subcool for (a) θ=180 deg and (b) θ=0 deg

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Figure 12

Comparison of frequency and departure diameter data with different correlations

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Figure 13

Variation of fDd product with (a) heat flux at θ=0 deg. (b) Jakob number at θ=180 deg.

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Figure 6

Images showing the bubble nucleation on the rear side of the upstream pin fins and along the circumference on the downstream pin fins for G=565 kg/m2 s under different heat fluxes

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Figure 7

Circumferential nucleation site distribution along the first pin fin to experience boiling various mass fluxes

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Figure 8

Sequence of images showing the bubbles nucleating at θ=0 deg and sliding along the circumference of pin fins (qw″=52.6 W/cm2 and G=827 kg/m2 s)

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Figure 9

Bubble departure diameter for (a) θ=0 deg and (b) θ=180 deg

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Figure 10

Bubble departure frequency for (a) θ=0 deg and (b) θ=180 deg

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