Thermal Performance of Pulsating Heat Stripes (PHS) Built with Plastic Materials

[+] Author and Article Information
Oguzhan Der

PhD Candidate, Laboratory of Technical Physics, School of Engineering, University of Liverpool, Liverpool, United Kingdom, L1 5AQ

Dr. Marco Marengo

Professor of Thermal Engineering, School of Computing, Engineering and Mathematics, University of Brighton, Brighton, United Kingdom, BN2 4GJ

Volfango Bertola

Senior Lecturer in Thermofluids, Laboratory of Technical Physics, School of Engineering, University of Liverpool, Liverpool, United Kingdom, L1 5AQ

1Corresponding author.

ASME doi:10.1115/1.4041952 History: Received September 13, 2018; Revised November 04, 2018


A low-cost, flexible pulsating heat pipe (PHP) was built in a composite polypropylene sheet consisting of three layers joint together by selective laser welding, to address the demand of heat transfer devices characterized by low weight, small unit thickness, low cost, and high mechanical flexibility. A thin, flexible and lightweight heat pipe is advantageous for various aerospace, aircraft and portable electronic applications where the device weight and its mechanical flexibility are essential. The concept is to sandwich a serpentine channel, cut out in a polypropylene sheet and containing a self- propelled mixture of a working fluid with its vapour, between two transparent sheets of the same material; this results into a thin, flat enclosure with parallel channels hence the name "pulsating heat stripes" (PHS). The transient and steady- state thermal response of the device was characterised for different heat input levels and different configurations, either straight or bent at different angles. The equivalent thermal resistance was estimated by measuring the wall temperatures at both the evaporator and the condenser, showing a multi- fold increase of the equivalent thermal conductance with respect to solid polypropylene.

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