Research On Heat Transfer And Flow Characteristics Of High Viscosity Fluid In New PHE

As a type of thermal power mechanical apparatus, plate heat exchangers are developing rapidly in recent years. Comapred with other types of thermal power apparatus, it is fewly used in heat transfer of high viscosity fluid for its disadvantage in flow resistance. The heat transfer and flow resistance properties of high viscos media in PHE are researched, which is based on the analys in critical factor of influencing heat transfer. The principles of synergism theory are applying in heat transfer properties analysis of new type PHE. Finally, thermol dynamical properties of plate heat exchangers in differential channel shape and mass flux using exergy.Heat transfer coefficient is determined on mass transport of the direction nomal to wall while tracking the idea of Reynolds and Prandtl in depicting heat convection. The heat convection can be analysis by using the ripe Blasius Resolution on unlimited plate. The result indicate that local heat transfer coefficient direct ratio to average velocity which direct upright to wall in thermal boundary layer. And compare that with the intergral energy equation in boundary layer. The synergism parameters are the velocity vector and the wall normal vector if the heat transfer coefficient is considered, and the parameters are the velocity vector and temperature field if the heat flux is considered.Thermal resistance in boundary layer is researched base on prandtl model and thickness thermal viscous layer in Prandtl Model are calculated. The propotion of conduction resistance increase and the propotion of convection resistance decrease with increase of Prandtl number. The ration between conduction ressistance and convection resistance unchanged with the development of boundary layer, and the ration decrease step with Prandtl Number increase. The ration touch a fix value after Pr>10.Heat transfer and flow resistance properties of compound corrugate PHE are tested on their experimental unit. The experimental correlated equation of heat transfer and flow resistance are achieved in the range of 2000