Ice slurry generator is a key equipment in the direct contact ice slurry making process.As an important assessment parameter of the ice slurry generator performance，the volumetric heat transfer coefficient is greatly affected by many factors.In this paper，qualitative analysis of various effects on the volumetric heat transfer coefficient is done，based on the rising characteristics of a single bubble in the continuous phase.The experimental results show that the decrease of the water column height，the inlet air temperature，and the nozzle diameter，as well as the increase of the air mass flow rate，will lead to an increase of the volumetric heat transfer coefficient.