Abstract
The hydraulic conveying of solids through a horizontal pipe rotating about its axis was investigated experimentally. The test sections consisted of 0.0277-m I.D. transparent acrylic pipes (approximately 0.52 m and 2.0 m long), and a 0.0184-m I.D. transparent acrylic pipe (approximately 1.41 m long). Spherical glass particles (0.0005-m and 0.001-m diameter) and ion exchange resin (0.0005-m diameter) were used. Data were obtained at delivered concentrations of solids up to 10% by volume, rotational speed up to 165 rpm and mean velocity of slurry up to 2.0 m/sec.
Transport concentrations of solids in rotating pipes were found to decrease with an increase of rotational speed of pipe. At the limit-deposit velocity the stationary bed in the flow was found to disappear by the rotation of the pipe. Rotational speed at which the stationary bed began to disappear tended to increase with increase of delivered concentration of solids.
The pressure gradient of slurry flowing in each rotating pipe was less than the corresponding stationary pipe pressure gradient. An empirical equation expressing the pressure drop for rotating pipe is proposed.
