A device for studying the behavior of a multiphase effluent in circulation includes a test pipe having two ends containing the effluent and a unit for delivering a working fluid alternately into each end of the pipe to effect movement of the effluent. The effluent to be studied which has been placed in the test pipe, is displaced according to an alternating circulation generated by injection of a working fluid into each of the ends of the pipe. A process for studying the behavior of the multiphase fluid in circulation involves placing the effluent in a test pipe, displacing the effluent in the test pipe in an alternating motion by delivering a working fluid alternately into each end of the pipe and measuring behavior of the effluent during the alternating displacement of the effluent.
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