Numerical simulation and performance analysis of multi structure Louver fins

Abstract

By using the Fluent built wind field for 6 types multi structures of louver fins by numerical simulation. Through the comparison of the heat transfer and flow properties of region division method, obtains the best. The results of the study show that, in the wind speed for the 2.5m/s case, region partition number for the heat transfer performance of louver fins 6 of the best. Compared with ordinary fins, the heat transfer coefficient increased by 9.5%, but the flow resistance is decreased slightly. This trend with the increase of the wind speed will be increased. When the wind speed is 6m/s, the heat transfer coefficient increases 17.7%, and the flow resistance increased slightly. Foreword Parallel flow heat exchanger fins with shutters have been widely used in automotive air conditioning, Because of its many advantages[1], so gradually being home air conditioning manufacturer's attention. According to the current study shows that in any type of air-cooled heat exchangers, air-side thermal convection heat transfer system of more than 75% of the total thermal resistance[2~ 4].Therefore, a lot of technology to improve the heat transfer surfaces are concentrated in the air-side. This paper uses Fluent simulation software for multi-louver fin structures were studied to better understanding of the mechanisms of heat transfer and flow enhancement, and then analyze a more effective method of sub-structures. Multi-fin structure blinds are Zhong Changxiong[5]who proposed. It is the use of the fin surface, with or without the rules of order, destruction of the fin surface of the fluid boundary layer, higher heat transfer coefficient. Traditional window blinds fin for windows, window area number 2. Multi louver structure, through which the distribution of irregularities, the fluid can be achieved by good, The flow field in the fin surface more evenly distributed, and thus more uniform temperature and pressure fields. There are essentially different in this paper designs and other regional blinds were raised fins Zhong changxiong。Zhong Changxiong proposed distribution is carried out based on the same size of the blinds,the article is based on maximizing the area occupied by the fin structure designed blinds, shutters size varies. increased slightly. Calculate the model Multi-window structure fin structure and geometry. This paper is the establishment of six models for analysis, table 1 is a total of six models of structural parameters. Fin height Tp and fin length Fd equal for all models, each model is designed to ensure the air-side heat transfer area is equal, so as to facilitate comparison of the quality of their heat transfer coefficient. Specific dimensions of each model shown in Fig.1 to 6. Which Fig. 2 is an ordinary fin model, its fenestration area is 2, so he called the 2nd Fin. 5th International Conference on Information Engineering for Mechanics and Materials (ICIMM 2015) © 2015. The authors Published by Atlantis Press 573 Table 1 There are structural parameters of the model Parameters Name BlindSpacing Lp Blind Angle θ Fin spacing Fp Fin thicknessδ Fin lengthFd Flat tube thicknessTd Imported zone lengthS1 Steering zone lengthS2 Fin heightT