Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
652258 | Experimental Thermal and Fluid Science | 2010 | 9 Pages |
Abstract
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.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Seontae Kim, Hyung Dae Kim, Hyungmo Kim, Ho Seon Ahn, Hangjin Jo, Joonwon Kim, Moo Hwan Kim,