关键词: 搅拌釜, 混合, 湍流, 流场, 粒子图像速度场仪

Abstract: Mixing in a stirred tank is a complicated unsteady turbulent process，which occurs in a confined space，and often with the strong processes of mass transfer，heat transfer and even chemical reaction. Many factors affect the stirring and mixing process in a stirred tank，making it difficult to analyze the process theoretically. This paper reviewed the development of flow measurement techniques used to study the stirring and mixing process in past several decades. Advantages of conventional measurement implements for the flow rate were discussed in detail. In addition，Particle image velocimetry （PIV），a new optical whole field velocity measurement technique was introduced in this paper. PIV has higher space- and time-resolution. PIV technique could have the advantages of obtaining 2D or 3D instant velocity fields，density field and temperature field of the mixing flow，and development of turbulent structure in the flow. Experimental studies using PIV can provide great help for building multi-phase flow model in the stirred tank，validating numerical simulated results and performing the optimal design of the stirred tank. In summary，the application of PIV should advance the research of chemical stirring and mixing technology.

Key words: stirred tank, mixing, turbulence, flow field, particle image velocimetry（PIV）