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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

TWO-PHASE FLOW AND HEAT TRANSPORT IN 3-D PRINTED PULSATING HEAT PIPES WITH DIFFERENT CHANNEL SIZES

Takahiro Arai
City College of New York, 160 Convent Avenue, New York, NY 10031, USA; Central Research Institute of Electric Power Industry (CRIEPI) 2-6-1 Nagasaka, Yokosuka, Kanagawa 240-0196, JAPAN

Masahiro Kawaji
City College of New York, 160 Convent Avenue, New York, NY 10031, USA

DOI: 10.1615/IHTC16.mpf.022146
pages 6217-6226


KEY WORDS: Two-phase/Multiphase flow, Measurement and instrumentation, Pulsating Heat Pipe, Two-phase Flow, Heat Transport, 3-D Printing, Additive Manufacturing

Abstract

This paper describes an experimental investigation of pulsating heat pipes (PHPs) fabricated using a 3-D printer and a polycarbonate resin for heat transport measurements and visualization of pulsating two-phase flow. HFE-7000 was used as a working fluid and the PHP was oriented vertically with the evaporator section at the bottom and condenser section at the top. To achieve satisfactory heat conduction in the evaporator and condenser sections, an aluminum plate was used as the substrate, on which a serpentine flow channel was directly printed by a 3-D printer to add or remove the heat more effectively. Transient temperature distributions on the PHP were measured by K-type thermocouples for different heater power levels applied to the evaporator section. In addition, oscillating two-phase flow in the serpentine channel was recorded using a high-speed digital video camera. Based on the flow visualization results, a classification of oscillating flow pattern and heat transport characteristics are presented.

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