Biofouling Bionic And Heat Transfer Modeland Numercial Simulation

Because all kinds of heat exchangers have different degrees of fouling and heat resistance,fouling on the surface of heat exchangers has caused huge econo mic losses,so scale prevention has always been concerned by the heat transfer f ield and one of the main problems to be solved urgently.in previous studies,mi crobial fouling growth is still studied by traditional experimental methods.therefo re,at the micro level,the interaction between the actual growth process of micro bial fouling and heat transfer of heat exchanger is not clear.in this paper,the g rowth,compaction and heat transfer process of microbial fouling on heat transfer surface are studied by numerical simulation.The factors affecting scaling in mic robial scaling process are summarized and the heat and mass transfer mechanism of the results is discussed.First of all,a cellular automata model was used to simulate the growth process of biofouling from a microscopic angle,and the simulation results were fitted and then compared with empirical data and formulas to make it verified;thus,a rule of the growth of biofouling for microscopic mechanism was achieved.Secondly,the biofouling on the the heat transfer surface is expressed in the form of mathematical and physical models to obtain the biofouling growth prediction model.and ues it to simulate the actual heat transfer surface operation to analyze the mechanism of heat and mass transfer in the process of biofouling and summarize the influential factors the scaling.Biofouling growth prediction model Numerical calculation area is a rectangular channel of 100×60 mm,mainly for the concentration of different microbial biomass in the fluid,inlet temperature,inlet flow velocity,heat exchanger surface temperature,heat flux and porosity to simulate the actual working condition of heat exchanger;the influential factors affecting microbial fouling on the heat transfer surface were deeply studied and analyzed,and drew the following conclusions: the biofouling thickness was distributed between 5 and 110?m,and the thermal conductivity of the biofouling was0.38W·m-1K-1;The higher the heat flux and inlet temperature,the higher the probability of microbial fouling adhering to the surface of the heat exchanger and the greater the thermal resistance of the microbiological fouling;as the flow rate increases,the shearing force of the fluid increases,which helps to increase the erosion of biofouling,the rate of biofouling reduces the thermal resistance;the increase of porosity will increase the density of biofouling and increase the thermal resistance.This study can be used as a reference for further understanding of the scientific problems of biofouling growth mechanism and heat transfer characteristics.