Numerical Study Of Effects On Turbulent Flow And Heat Transfer In Primary Surface Wavy Channel

With the development of modern new technology, the problem of energy increasing seriously, it has been demanded more power and energy heat exchange equipment. The heat exchanger function has played an important role that relate to energy utilization, product quality and the system of reliability and economy. Sometimes even the decisive role. Therefore it is an important method to develop and make use of energy effectively with designing and producing all kinds of high-function heat transfer equipment. Encouraging people to in-depth research and discuss heat transfer technology. Flow structure has been changed using complex geometric shape of heat exchange channels. It is one of the effective methods with making channel fluid mutual interference and mixed, which produce no larger pressure drop. The enhancement heat transfer of Primary Surface is developed and put forward in this context. It was applied in practice more widely using finned for main heat-exchange components in corrugated plate heat exchanger.Modeling pretreatment software GAMBIT2.0 is used to establish reasonable grid and numerical model of the Primary Surface channel under four kinds of structural type. Simulate the flow and heat transfer of certain physical parameter air in two-dimensional periodically wavy channels use numerical simulation software FLUENT6.3. The comparison of air which in different kinds of structural types with constant wall temperature on turbulent flow and heat transfer were done, and the effects of the fin spacing ratio and different phase shifts for different structure types on the turbulent flow and heat transfer performances were analyzed. The research obtains temperature distribution, streamline distribution, shearing stress distribution, averaged Nusselt number, friction factor and goodness factor of different structure types channel with different Reynolds number. Comparing results of the different tested channels by considering the flow area goodness factor, and the turbulent flow and heat transfer characteristics in different channels were disclosed. In one word, this provides reference for exploiting new heat exchanger channels.The results showed that:the heat transfer efficiency of every channel first increased slowly than decreased slowly when the fin spacing ratio increased, and it change complex when the Reynolds number changed. The low Reynolds number's heat transfer efficiency of channel is lower than large Reynolds number's. When the phase shift of corrugated plate is 0°, the heat transfer efficiency of every channel studied in this paper, the efficiency of sinusoidal and triangle channel is the best, the efficiency of ribs channel takes the second place, and the efficiency of rectangular is the worst. When the phase shift of corrugated plate is 90°, the efficiency of triangle channel is the best. When the phase shift of corrugated plate is 180°, the efficiency of ribs channel is the best. Moreover, the wall shear stress, the flow, the heat exchange, and friction factor are influenced by geometric parameters about every channel. In practical selection of shall, according to the design requirements and operating conditions, the engineer should consider and choice the reasonable Reynolds number range.