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Início Arquivos Thermal Letter Representantes Futuras reuniões Assembléia das Conferências Internacionais de Transferência de Calor
International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

OPTIMIZATION OF STRUCTURE ON CONDENSATION ON SUHERPHYDROPHOIBIC SURFACES (SHSs) AND SLIPPERY LUBRICANT-INFUSED POROUS SURFACES (SLIPS)

Daniel Orejon
International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan; Department of Mechanical Engineering, Thermofluid Physics Laboratory, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan; School of Engineering, The University of Edinburgh, Edinburgh EH9 3FB, Scotland, UK

Yota Maeda
Department of Mechanical Engineering, Thermofluid Physics Laboratory, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

Fengyong Lv
Institute of Refrigeration and Cryogenics, MOE Laboratory for Power Machinery and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Rd. Minhang District, Shanghai 200240, China

Peng Zhang
Institute of Refrigeration and Cryogenics, MOE Key Laboratory of Power Machinery and Engineering, Shanghai Jiao Tong University, 800 Dong Chuan Rd. Minhang District, Shanghai 200240, China

Yasuyuki Takata
Department of Mechanical Engineering, Thermofluid Physics Laboratory, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan; International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan

DOI: 10.1615/IHTC16.cod.023496
pages 2425-2432


Palavras-chave: Condensation, Heat transfer enhancement, Nanostructured Superhydrophobic Surfaces, SLIPS, Condensation Heat Transfer, Microstructures, Droplet-Jumping

Resumo

Superhydrophobic Surfaces (SHSs) and Slippery Lubricant-Infused Porous Surfaces (SLIPSs) are proposed as excellent anti-icing, self-cleaning and condensation heat transfer surfaces due to their ability to repel water. The low droplet adhesion on SHSs and SLIPs is due to the low contact angle hysteresis displayed between the condensate and the surface, when compared to hydrophobic and/or to hydrophilic surfaces. In the case of SHSs, their extreme low adhesion is owed to the presence of air entrapped in between the condensate droplets and the surface, whereas in the case of SLIPS, their inherent low adhesion is due to the presence of a low surface energy lubricant oil in between the micro- and/or the nano-structures and the condensate. As a consequence, on both surfaces the condensate easily sheds by gravity and in the case of SHSs by coalescence-induced droplet-jumping. In this paper we investigate the condensation behavior on engineered SHSs and SLIPSs with structural roughness varying from the micro- to the nano-scale. Experimental observations and energy analysis is presented to demonstrate the different condensation performance observed depending on the surface structural finish underneath the condensate. We report the enhancement in the coalescence-induced droplet-jumping performance on SHSs and the greater theoretical heat transfer performance on SLIPSs. We conclude on the importance of taking into account the microstructures underneath the condensate for the optimum design of both SHSs and SLIPS.

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