Nanocapillarity in Graphene Oxide Laminate and Its Effect on Critical Heat FluxSource: Journal of Heat Transfer:;2017:;volume( 139 ):;issue: 008::page 82402DOI: 10.1115/1.4036282Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The nanocapillarity phenomenon involves ultralow frictional flow of water molecules through nanoscale channels, and here we study this using exceptionally large number of nanochannels within graphene oxide (GO) laminates. The nanoconfined water molecules in GO nanochannels form square lattice (as in the ice bilayer), which melts and jumps across the channels, similar to slip flow, with mean speed of the order of 1 m/s. This ease of liquid spreading in GO laminate is used to delay the critical heat flux (CHF) phenomenon in water pool boiling, by preventing formation/growth of dry spots. The water nanocapillarity speed is derived based on the measured water penetration flux, and the CHF enhancement (up to 140%) is demonstrated on a 1-μm-thick GO laminate. The GO laminate offers efficient surface modifications for increased transport efficiency (and safety margin) of pool boiling heat transfer systems.
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contributor author | Kim, Ji Min | |
contributor author | Kim, Ji Hoon | |
contributor author | Kim, Moo Hwan | |
contributor author | Kaviany, Massoud | |
contributor author | Ahn, Ho Seon | |
date accessioned | 2017-11-25T07:16:56Z | |
date available | 2017-11-25T07:16:56Z | |
date copyright | 2017/25/4 | |
date issued | 2017 | |
identifier issn | 0022-1481 | |
identifier other | ht_139_08_082402.pdf | |
identifier uri | http://138.201.223.254:8080/yetl1/handle/yetl/4234303 | |
description abstract | The nanocapillarity phenomenon involves ultralow frictional flow of water molecules through nanoscale channels, and here we study this using exceptionally large number of nanochannels within graphene oxide (GO) laminates. The nanoconfined water molecules in GO nanochannels form square lattice (as in the ice bilayer), which melts and jumps across the channels, similar to slip flow, with mean speed of the order of 1 m/s. This ease of liquid spreading in GO laminate is used to delay the critical heat flux (CHF) phenomenon in water pool boiling, by preventing formation/growth of dry spots. The water nanocapillarity speed is derived based on the measured water penetration flux, and the CHF enhancement (up to 140%) is demonstrated on a 1-μm-thick GO laminate. The GO laminate offers efficient surface modifications for increased transport efficiency (and safety margin) of pool boiling heat transfer systems. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | Nanocapillarity in Graphene Oxide Laminate and Its Effect on Critical Heat Flux | |
type | Journal Paper | |
journal volume | 139 | |
journal issue | 8 | |
journal title | Journal of Heat Transfer | |
identifier doi | 10.1115/1.4036282 | |
journal fristpage | 82402 | |
journal lastpage | 082402-9 | |
tree | Journal of Heat Transfer:;2017:;volume( 139 ):;issue: 008 | |
contenttype | Fulltext |