Nanocapillarity in graphene oxide laminate and its effect on critical heat flux

[+] Author and Article Information
Ji Min Kim

Division of Advanced Nuclear Engineering, POSTECH San 31, Hyoja-dong, Nam-gu, Pohang, Kyungbuk, Republic of Korea

Ji Hoon Kim

Department of Mechanical Engineering, Incheon National University Songdo 1(il)-dong, Yeonsu-gu, Incheon, Republic of Korea

Moo Hwan Kim

Division of Advanced Nuclear Engineering, POSTECH San 31, Hyoja-dong, Nam-gu, Pohang, Kyungbuk, Republic of Korea

Massoud Kaviany

Department of Mechanical Engineering, University of Michigan Ann Arbor, Michigan 48109, USA

Ho Seon Ahn

Songdo dong Incheon, Incheon 406-772 Republic of Korea

1Corresponding author.

ASME doi:10.1115/1.4036282 History: Received August 19, 2016; Revised March 09, 2017


The nanocapillarity phenomenon involves the ultra-low frictional flow of water molecules via a nanoscale channel, here, numerous nanochannels within graphene oxide (GO) laminates. The nano-confined water molecules in the GO nanochannels form the square lattice of an ice bilayer, which melts and jumps into other channels, so that they can slip between the GO flakes at a speed of a few m/s. In this work, a GO laminate was suggested as a water inflow channel using nanocapillarity to delay the critical heat flux (CHF) phenomenon in a boiling heat transfer system, whereby the growth and formation of dry spots can be prevented. The nanocapillarity speed of the water molecules into the nanochannels was derived based on the measured water penetration flux. CHF enhancement was demonstrated, up to 139%, on a 1-┬Ám-thick GO laminate. Accordingly, the GO laminate offers an efficient modification method to increase the efficiency and safety margin of heat transfer systems.

Copyright (c) 2017 by ASME
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