0
Research Papers: Micro/Nanoscale Heat Transfer

Enhanced Subcooled Flow Boiling Heat Transfer in Microchannel With Piranha Pin Fin

[+] 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,
4000 Central Florida Boulevard,
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,
4000 Central Florida Boulevard,
Orlando, FL 32816
e-mail: Yoav.Peles@ucf.edu

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received October 14, 2016; final manuscript received February 13, 2017; published online June 21, 2017. Assoc. Editor: Satish G. Kandlikar.

J. Heat Transfer 139(11), 112402 (Jun 21, 2017) (13 pages) Paper No: HT-16-1664; doi: 10.1115/1.4036683 History: Received October 14, 2016; Revised February 13, 2017

An experimental study on subcooled flow boiling with engineering fluid HFE-7000 in a microchannel fitted with piranha pin fins (PPFs) is presented. Heat fluxes of up to 735 W/cm2 were achieved and mass fluxes ranged from 618 kg/m2s to 2569 kg/m2 s. It was found that the flow boiling heat transfer was significantly enhanced with PPFs. The heat transfer coefficient with flow boiling was double the corresponding single-phase flow. Correlations for two-phase heat transfer coefficient and pressure drop in the nucleate flow boiling regime were developed based on the boiling, Weber, and Jakob numbers. The onset of nucleate boiling (ONB) and the critical heat flux (CHF) conditions were determined through visualization and was typically initiated from the last row of fins where temperatures were highest and flow rates lowest.

Copyright © 2017 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Fig. 1

PPFs conceptual design

Grahic Jump Location
Fig. 2

Schematic diagram for experimental apparatus

Grahic Jump Location
Fig. 3

The package and device [35]: (a) exploded diagram for test package, (b) PPFs device, and (c) PPFs array images taken by microscope

Grahic Jump Location
Fig. 4

Dimensions for the micro device and PPF arrays: (a) device dimension and (b) dimension of PPF array

Grahic Jump Location
Fig. 5

Tw versus qbase under different reference pressures (Gin = 618 kg/m2 s): (a) boiling curve and ONB and (b) visualization of ONB under different reference pressures (examples of vapor bubbles are circled out in the second row)

Grahic Jump Location
Fig. 6

Boiling curves with multiple mass fluxes (Gin = 618 kg/m2s; 1597 kg/m2s; 2569 kg/m2s) under Pref = 514 kPa

Grahic Jump Location
Fig. 7

Flow boiling visualization under different conditions at ONB (Pref = 514 kPa). (a) Gin = 618 kg/m2s; qbase = 230 W/cm2, (b) Gin = 1597 kg/m2s, kg/m2s; qbase = 320 W/cm2, and (c) Gin = 2569 kg/m2s, qbase = 460 W/cm2.

Grahic Jump Location
Fig. 8

Single-phase and two-phase heat transfer coefficient versus heat flux under different reference pressures: (a) single-phase heat transfer coefficient in plain channel versus channel with PPF, (b) Pref = 238 kPa, (c) Pref = 376 kPa, and (d) Pref = 514 kPa

Grahic Jump Location
Fig. 9

Highest heat flux achieved before CHF under different system pressure

Grahic Jump Location
Fig. 10

Heat transfer enhancement factor for multiple mass fluxes (Gin = 618 kg/m2s; 1597 kg/m2s; 2569 kg/m2s) with different reference pressures ((a) Pref = 238 kPa, (b) Pref = 376 kPa, and (c) Pref = 514 kPa)

Grahic Jump Location
Fig. 11

Predicted and measured heat transfer coefficient for cases with multiple mass fluxes (Gin = 618 kg/m2s; 1597 kg/m2s; 2569 kg/m2s) and reference pressures ((a) Pref = 238 kPa, (b) Pref = 376 kPa, and (c) Pref = 514 kPa)

Grahic Jump Location
Fig. 12

Repeatability test: Tw versus qbase″ with Gin = 2569 kg/m2s; Pref = 376 kPa

Grahic Jump Location
Fig. 13

High-speed images at different mass flux (Pref = 514 kPa): (a) Gin = 618 kg/m2s, (b) Gin = 1597 kg/m2s, and (c) Gin = 2569 kg/m2s

Grahic Jump Location
Fig. 14

Schematic of the flow boiling developing process at low mass flux (a) and high mass flux (b)

Grahic Jump Location
Fig. 15

Pressure drop versus heat flux (Pref = 238 kPa)

Grahic Jump Location
Fig. 16

Predicted and measured Φ2 for cases with multiple mass fluxes (Gin = 618 kg/m2s; 1597 kg/m2s; 2569 kg/m2s) and reference pressures ((a) Pref = 238 kPa, (b) Pref = 376 kPa, and (c) Pref = 514 kPa)

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In