Dropwise condensation on superhydrophobic surfaces with two-tier roughness

Chuan Hua Chen; Qingjun Cai; Chialun Tsai; Chung-Lung Chen; Guangyong Xiong; Ying Yu; Zhifeng Ren

doi:10.1063/1.2731434

Dropwise condensation on superhydrophobic surfaces with two-tier roughness

Chuan Hua Chen^*, Qingjun Cai, Chialun Tsai, Chung-Lung Chen, Guangyong Xiong, Ying Yu, Zhifeng Ren

^*Corresponding author for this work

Department of Mechanical Engineering

Research output: Contribution to journal › Article

308 Scopus citations

Abstract

Dropwise condensation can enhance heat transfer by an order of magnitude compared to film condensation. Superhydrophobicity appears ideal to promote continued dropwise condensation which requires rapid removal of condensate drops; however, such promotion has not been reported on engineered surfaces. This letter reports continuous dropwise condensation on a superhydrophobic surface with short carbon nanotubes deposited on micromachined posts, a two-tier texture mimicking lotus leaves. On such micro-/nanostructured surfaces, the condensate drops prefer the Cassie state which is thermodynamically more stable than the Wenzel state. With a hexadecanethiol coating, superhydrophobicity is retained during and after condensation and rapid drop removal is enabled.

Original language	English
Article number	173108
Journal	Applied Physics Letters
Volume	90
Issue number	17
DOIs	https://doi.org/10.1063/1.2731434
State	Published - 21 May 2007

Access to Document

10.1063/1.2731434

Link to publication in Scopus

Fingerprint Dive into the research topics of 'Dropwise condensation on superhydrophobic surfaces with two-tier roughness'. Together they form a unique fingerprint.

Cite this

Chen, C. H., Cai, Q., Tsai, C., Chen, C-L., Xiong, G., Yu, Y., & Ren, Z. (2007). Dropwise condensation on superhydrophobic surfaces with two-tier roughness. Applied Physics Letters, 90(17), [173108]. https://doi.org/10.1063/1.2731434

@article{eebd957b4d3f4ac7a1289e445df08439,

title = "Dropwise condensation on superhydrophobic surfaces with two-tier roughness",

abstract = "Dropwise condensation can enhance heat transfer by an order of magnitude compared to film condensation. Superhydrophobicity appears ideal to promote continued dropwise condensation which requires rapid removal of condensate drops; however, such promotion has not been reported on engineered surfaces. This letter reports continuous dropwise condensation on a superhydrophobic surface with short carbon nanotubes deposited on micromachined posts, a two-tier texture mimicking lotus leaves. On such micro-/nanostructured surfaces, the condensate drops prefer the Cassie state which is thermodynamically more stable than the Wenzel state. With a hexadecanethiol coating, superhydrophobicity is retained during and after condensation and rapid drop removal is enabled.",

author = "Chen, {Chuan Hua} and Qingjun Cai and Chialun Tsai and Chung-Lung Chen and Guangyong Xiong and Ying Yu and Zhifeng Ren",

year = "2007",

month = may,

day = "21",

doi = "10.1063/1.2731434",

language = "English",

volume = "90",

journal = "Applied Physics Letters",

issn = "0003-6951",

publisher = "American Institute of Physics",

number = "17",

}

TY - JOUR

T1 - Dropwise condensation on superhydrophobic surfaces with two-tier roughness

AU - Chen, Chuan Hua

AU - Cai, Qingjun

AU - Tsai, Chialun

AU - Chen, Chung-Lung

AU - Xiong, Guangyong

AU - Yu, Ying

AU - Ren, Zhifeng

PY - 2007/5/21

Y1 - 2007/5/21

N2 - Dropwise condensation can enhance heat transfer by an order of magnitude compared to film condensation. Superhydrophobicity appears ideal to promote continued dropwise condensation which requires rapid removal of condensate drops; however, such promotion has not been reported on engineered surfaces. This letter reports continuous dropwise condensation on a superhydrophobic surface with short carbon nanotubes deposited on micromachined posts, a two-tier texture mimicking lotus leaves. On such micro-/nanostructured surfaces, the condensate drops prefer the Cassie state which is thermodynamically more stable than the Wenzel state. With a hexadecanethiol coating, superhydrophobicity is retained during and after condensation and rapid drop removal is enabled.

AB - Dropwise condensation can enhance heat transfer by an order of magnitude compared to film condensation. Superhydrophobicity appears ideal to promote continued dropwise condensation which requires rapid removal of condensate drops; however, such promotion has not been reported on engineered surfaces. This letter reports continuous dropwise condensation on a superhydrophobic surface with short carbon nanotubes deposited on micromachined posts, a two-tier texture mimicking lotus leaves. On such micro-/nanostructured surfaces, the condensate drops prefer the Cassie state which is thermodynamically more stable than the Wenzel state. With a hexadecanethiol coating, superhydrophobicity is retained during and after condensation and rapid drop removal is enabled.

UR - http://www.scopus.com/inward/record.url?scp=34248577551&partnerID=8YFLogxK

U2 - 10.1063/1.2731434

DO - 10.1063/1.2731434

M3 - Article

AN - SCOPUS:34248577551

VL - 90

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 17

M1 - 173108

ER -