The Impact Of Particles On The Double Chamber And Double Tube Pass Evaporator Heat Transfe Performance

The novel double chamber and double-tube evaporator technology draw on the advantages of multi-chamber and multi-tube evaporator technology, applicable to the material what evaporation viscosity change with concentration greater. This evaporator reduce the resistance loss by material flow, improve the heat transfer coefficient the evaporator and also can reduce equipment investment and floor space as the same time.The structure characteristic of the novel double chamber double-tube evaporator is using a isolation board divide one separation chamber into two compartments, each of the sub-chambers were used in series with the double-barreled process heating chamber operation mode,understanding the influence of its internal flow characteristics and operating parameters have a important significance.This paper is based on the experimental study and numerical studuy of double chamber and double-tube evaporator technology by Meng Liu, Jing-Jing Wang et al, through the preparation of different proportions of water-glycerol solution and added to an inert solid particles in the circulation pipe,using experimental method study the heat transfer performance of the double chamber and double-tube evaporator. Investigated the heat transfer performance when vapor-liquid-solid three-phase current in the double chamber and double-tube evaporator and the influence of the double chamber and double-tube evaporator’s average heat transfer coefficient on the volume fraction of solid particles, the viscosity of the material, the diameter of the solid particles, the type of heating tube heat flux.Experimental results show that:the double chamber double tube evaporator inert solid particles, having a good heat transfer effect, the average heat transfer coefficient increased about12%, and the average heat transfer coefficient increase with the heat flux qu (or the heat flux qd), the average heat transfer coefficient of the double chamber double-tube evaporator first increases with particle volume fraction and particle diameter, when the particle volume fraction of2.06%, the particles diameter in6mm, the heat transfer coefficient reaches a maximum and shows a downward trend after. Under certain conditions in the same volume fraction and particle size, the average heat transfer coefficient of the double chamber double-tube evaporator decreases with the increase of the viscosity of the material. And to get the same concentration of the material, the addition of solid particles in the double chamber double the tube evaporator can shorten the evaporation time, improve production efficiency and higher discharge concentration, the advantages of inert particles to reflect the more obvious.