Device and method for testing drag reduction mechanism of high-Reynolds-number slickwater fracturing fluid

The invention discloses a high Reynolds number slickwater fracturing fluid drag reduction mechanism testing device and method.The testing device comprises a sand storage tank, a first input pump, a sand mixing tank, a second input pump, a Venturi tube, a testing tube, a solid-liquid separator and a third input pump which are sequentially connected, and the testing tube is a transparent glass tube; a flowmeter I is arranged between the test tube and the solid-liquid separator; pressure sensors are arranged at the two ends of the test tube, a PIV test system is arranged at the top of the test tube, and a CCD camera is arranged on the front face or the back face of the test tube; the output end of the third input pump is connected with the sand mixing tank and the liquid storage tank, and the output end of the liquid storage tank is connected with a negative pressure tapping opening of the Venturi tube. The high Reynolds number flowing sand-carrying process of the slickwater fracturing fluid in the pipeline can