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Research Papers: Heat Exchangers

Experimental Investigation of Oscillating Heat Pipe With Hybrid Fluids of Liquid Metal and Water

[+] Author and Article Information
Tingting Hao

Department of Mechanical and
Aerospace Engineering,
University of Missouri–Columbia,
Columbia, MO 65201;
Liaoning Key Laboratory of Clean Utilization of
Chemical Resources,
Institute of Chemical Engineering,
Dalian University of Technology,
Dalian 116024, China

Hongbin Ma

Department of Mechanical and
Aerospace Engineering,
University of Missouri–Columbia,
Columbia, MO 65201
e-mail: mah@missouri.edu

Xuehu Ma

Liaoning Key Laboratory of Clean Utilization
of Chemical Resources,
Institute of Chemical Engineering,
Dalian University of Technology,
Dalian 116024, China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received December 8, 2018; final manuscript received April 17, 2019; published online May 14, 2019. Assoc. Editor: Danesh K. Tafti.

J. Heat Transfer 141(7), 071802 (May 14, 2019) (6 pages) Paper No: HT-18-1802; doi: 10.1115/1.4043620 History: Received December 08, 2018; Revised April 17, 2019

A new oscillating heat pipe (OHP) charged with hybrid fluids can improve thermal performance. The key difference in this OHP is that it uses room temperature liquid metal (Galinstan consisting of gallium, indium, and tin) and water as the working fluid. The OHP was fabricated on a copper plate with six turns and a 3 × 3 mm2 cross section. The OHP with hybrid fluids as the working fluid was investigated through visual observation and thermal measurement. Liquid metal was successfully driven to flow through the OHP by the pressure difference between the evaporator and the condenser without external force. Experimental results show that while added liquid metal can increase the heat transport capability, liquid metal oscillation amplitude decreases as the filling ratio of liquid metal increases. Visualization of experimental results show that liquid metal oscillation position and velocity increase as the heat input increases. Oscillating motion of liquid metal in the OHP significantly increases the heat transfer performance at high heat input. The lowest thermal resistance of 0.076 °C/W was achieved in the hybrid fluids-filled OHP with a heat input of 420 W. We experimentally demonstrated a 13% higher heat transfer performance using liquid metal as the working fluid compared to an OHP charged with pure water.

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Figures

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Fig. 1

Schematic of the experimental setup

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Fig. 2

(a) Photo, (b) detailed dimensions, and (c) cross section of the copper flat plate OHP

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Fig. 3

Schematic drawing and photograph of liquid slug and liquid metal oscillating motions in OHP charged with hybrid working fluids consisting water and 5 g galinstan at the heat input of (a) 180 W, (b) 260 W, and (c) 340 W

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Fig. 4

Liquid metal position variations with heat input in OHPs charged with (a) water and 2 g galinstan, (b) water and 5 g galinstan, and (c) water and 8 g galinstan

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Fig. 5

Liquid metal velocity variations with heat input in OHPs charged with (a) water and 2 g galinstan, (b) water and 5 g galinstan, and (c) water and 8 g galinstan

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Fig. 6

OHPs charged with water and hybrid fluids consisting of water and liquid metal: (a) thermal resistance and (b) average evaporator temperature

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