Effects of nano-fluid and surfaces with nano structure on the increase of CHF

Critical heat flux (CHF) has necessitated inconvenient compromises between economy and safety in most industries related to thermal systems. Recent development of nanotechnology has enabled synthesis of nano-sized particles and development of new heat transfer fluids with suspended nano-sized partic...

Full description

Saved in:
Bibliographic Details
Published in:Experimental thermal and fluid science 2010-05, Vol.34 (4), p.487-495
Main Authors: Kim, Seontae, Kim, Hyung Dae, Kim, Hyungmo, Ahn, Ho Seon, Jo, Hangjin, Kim, Joonwon, Kim, Moo Hwan
Format: Article
Language:English
Subjects:
Applied sciences
Boiling
COOLING
CRITICAL HEAT FLUX
Critical heat flux (CHF)
DEPOSITION
Energy
Energy. Thermal use of fuels
ENGINEERING
Exact sciences and technology
Fluid dynamics
Fluid flow
GEOMETRY
HEAT TRANSFER
HEAT TRANSFER FLUIDS
Liquid spreadability
LIQUIDS
Micro-posts
Microposts
Nano structure
Nano-fluid
Nanocomposites
Nanofluids
Nanomaterials
Nanorods
NANOSCIENCE AND NANOTECHNOLOGY
Nanostructure
NANOSTRUCTURES
POOL BOILING
SURFACES
Theoretical studies. Data and constants. Metering
WETTABILITY
ZINC OXIDES
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Critical heat flux (CHF) has necessitated inconvenient compromises between economy and safety in most industries related to thermal systems. Recent development of nanotechnology has enabled synthesis of nano-sized particles and development of new heat transfer fluids with suspended nano-sized particles, i.e., nanofluids. When nanofluids were used in boiling heat transfer cooling, anomalous increase of CHF was reported. Subsequently, nanoparticle deposition on the boiling surface was revealed to contribute to CHF enhancement. Research on surface characteristics determined that three major characteristics affect CHF: wettability, liquid spreadability and multi-scale geometry. We fabricated artificially modified surfaces with arrays of octagonal micro-posts, or ZnO nanorods, or both, and measured their performance in enhancing CHF. The presence of three major characteristics enhanced CHF most.
ISSN:0894-1777
1879-2286
DOI:10.1016/j.expthermflusci.2009.05.006