Abstract:

During the preparation process of the cold storage slurry,the crystal layer adheres and accumulates on the surface of the heat exchanger, which greatly worsens the heat transfer characteristics and reduces the system efficiency. It is found that when the binary eutectic solution is in the solid-liquid two-phase region, there is a micron level liquid film between the heat transfer surface and the crystal layer, which will significantly reduce the adhesion of the crystal layer. In this paper, the crystallization model of two components eutectic solution is put forward. With urea solution as the research object, the adhesion of crystal layer under different working conditions is tested by the crystallization and scour experiment. In the scour experiment of the crystal layer in the solid-liquid two-phase region urea solution, it is found that the crystal layer can be scoured and shedding under the suitable flow rate and supercooling degree. However, the crystalline layer with solid phase region can not be thoroughly washed away. The experiment shows that there is a positive correlation between supercooling and adhesion, and indirectly proves the existence of micro liquid film.