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(Color online) Relation between CHF phenomena and capillary wicking. (a) Reversible dry spot (see Ref. 13). (b) Capillary spreading of a liquid drop over thin porous layers with a small apparent contact angle. (c) Capillary rewetting flow toward a dry spot region during bubble growth on porous layers.
Scanning electron micrographs of (a) bare NiCr wire and of nanoparticle-deposited wire produced during pool boiling of water-based nanofluids containing (b) , (c) , and (d) Ag nanoparticles with a concentration.
(Color online) Relation between CHF and surface characteristics: (a) CHF of pure water vs the contact angle on nanoparticle-deposited surfaces. (b) Scanning electron micrographs and (c) maximum capillary wicking height of pure water on (A) and (B) nanoparticle-deposited surfaces with different CHF values at similar contact angles of approximately 20°.
(Color online) Comparison between the heat flux gain due to the capillarity and the experimental CHF value on nanoparticle-fouled surfaces on which apparent contact angles of pure water are near 20°.
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