Another important characteristic of reverse circulation drilling operations is that most of these operations are carried out using compressed air or other gases as drilling circulation fluids. Reverse circulation drilling operations have become very important as an efficient drilling technology for large diam...
In place of the Kutta condition, additional equations are employed for determining the total circulations for the three vorticity components about the body. To validate the proposed method, simple examples, such as a sphere in a uniform flow and a sphere in an accelerated flow, are treated as ...
These circulations of fluids are probably responsible for the dolomitization of the original limestones and for the deposition of the ore through microbial activity (Gauthier, 1984; Gauthier el al., 1985b). The occurrence of this activity is supported by the formation of two kinds of organic ...