Author(s): Yu Wang; Jianhua Wu; Kunpeng Su
Linked Author(s): Jianhua Wu
Keywords: Cavitation erosion; Polyacrylamide solution; Viscosity
Abstract: It is uncertain whether polymer solutions will aggravate cavitation erosion. This uncertainty may be related to the degradation rate and physical properties of the polymer solutions, especially the alteration of the liquid viscosity. In the present paper, polyacrylamide solutions, used in the previous works, were selected. The degradation rates of the liquid viscosity were measured during the period of120 hr, and the steady time of degradation was determined to be about 90 hr at least for the polyacrylamide solutions. By means of a vibratory apparatus, cavitation erosion tests were conducted after the steady time of the polyacrylamide solutions for the different concentrations and temperatures of the solutions. The results demonstrate that, where polyacrylamide solutions were concerned, there was a certain performance of cavitation erosion, i.e., those solutions will decrease cavitation erosion comparing distilled water with no additives. Meanwhile, the higher the concentration and the lower the temperature is, the less cavitation erosion will be. Furthermore, the performance of cavitation erosion is discovered to be directly related to the polyacrylamide solution viscosity. The concentration and temperature change the solution viscosity, and then influence the performance of cavitation erosion.