The self-cleaning direction of dropwise condensation control on micro pyramid

• Main Authors: Jheng-Shin Chang, 張鎮薪
• Other Authors: 許華倚
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/7xd9kc

碩士 === 國立臺北科技大學 === 製造科技研究所 === 105 === The main purpose of CFD is to simulate the effect of different hydrophilic and hydrophobic pyramids on the directional control of drip condensation, mainly to find out the conditions of droplet bounce and the effect of changing the contact angle of the surface on droplet condensation. The module used in the numerical simulation is the Volume of Fluid (VOF) module, and the calculation method is PISO. This method can accelerate the convergence rate of the asymmetric mesh region. In this paper, the first part is to control the direction of droplet movement by different surface characteristics. The second part is to discuss the control of droplet detachment from symmetry pyramid. Removal of the interaction effect with the contact angle. The third part is to use different hydrophobic angle pyramid to control the direction of the droplet self-removal. The contact angle of the left pyramid of the fixed model is maintained at 180 degrees. The contact angle of the right pyramid is between 0 and 180 , by the thermal vapor condensed phase into condensate droplets, droplet condensation process by observing the direction of the droplet detachment, the purpose is to accelerate the droplet on the surface so the efficiency of droplet condensation can be maintained.