This paper is concerned with the water hammer in coarse solidliquid two-phase flows in pipes. Theoretical consideration was made on in-situ concentrations, and the equations to analyze the water hammer phenomena in coarse solid-liquid two-phase flows in pipes were propoased. The calculated results for maximum surge pressure were compared with the experimental results. The agreement was observed to be good. Therefore, it was confirmed that this model proposed here is applicable to the high concentrated twophase flows.
