PARTICLE IMAGE VELOCIMETRY AND NUMERICAL STUDIES OF ARTIFICIAL UPWELLING VIA DIFFERENTIAL HEATING IN OPEN SURROUNDINGS

Artificial upwelling is considered as a promising technology to recover the marine environment, especially for fishery environment recovery. This paper studied basic characteristics of "differential-heating- liquid- upwelling" (DHLU) in open surroundings with PIV and numerical analysis. Flow field of upwelling under typical condition was measured with particle image velocimetry (Plv), and a reasonable numerical model was built on the base of experimental data to study the key characteristics of DHLU system by numerical simulations. Results show that the upwelling in DHLU is mainly driven by the masses with high ascending speed. It is reasonable to choose k-epsilon turbulence model to study the flow field of DHLU in simulation. All of the three important parameters such as characteristic ascending speed, the cross-sectional area of upwelling stream and the upwelling's flow rate are all increase firstly and then decreases while the height from the heating source increases. But the position of maximum value for characteristic ascending speed is much lower than the other two parameters. The drop of ambient temperature is not favorable for the production of upwelling. A flow rate as high as 95.9 cm(3)/s was reached in studied cases in this paper.