The Research Of Channel Surface Treatment On Flow And Heat Transfer

The reasonable application of heat transfer enhancement technology not only can achieve the purpose of saving energy, but also can reduce the costs of investment and operation, increase productivity. Heat transfer enhancement usually is with flow resistance increased. IT is very important for heat transfer enhancement that how to enhance the heat transfer meanwhile minimize the increased resistance or even reduce the flow resistanceResearch results show that he solid wall of the water channel make the superhydrophobic processing, which can effectively enhance convective heat transfer and reduce flow resistance. Longitudinal vortex generator is a kind of effective passive heat transfer enhancement technology, through the produce secondary flow, it can interrupt boundary layer development, enhancing the heat transfer. If the longitudinal vortex generator and super hydrophobic material are combined to use in the heat exchanger equipment, it will be able to improve the heat transfer performanceThe content of this document is that longitudinal vortex generator and super hydrophobic material are combined through different forms, These different combinations’characteristics of flow and heat transfer are numerically analyzed by using the FLUENT. The study found that that after the super hydrophobic treatment in the channel, the flow resistance is significantly reduced and the convective heat transfer may be weakened, but the integrated heat transfer effect is significantly enhanced. Compared with the rectangular wings, a combined wings have a better flow and heat transfer performance, and combined wings are placed in a semi-circular channel or3/4circular channel, with superhydrophobic materials to further enhance the channel the heat transfer enhancement effect. As the four corners of the rectangular channel structure limits the development of the vortex, while the contact of vortex and four corners will produce the corresponding resistance, when converted into the semicircular channel, or3/4circular channel, the growth and development of the vortex are better than rectangular channel.