If a plant for horizontal hydraulic transport of solids is to be designed the expected pressure loss must be known as exactly as possible because of its decisive influence on such values as pipe diameter, installed power and transport velocity. As the expenses for design tests in most cases are too high, empirical and semi-empirical equations have been developed, so as to be able to predict theoretically the pressure loss for solids conveying. Besides plant data such as pipe diameter velocity, pressure loss and pipe length, many more parameters are determined by the solids themselves and these usually vary from one solid to the other. Among these are density average particle diameter, particle shape, friction behaviour and particle-size distribution. Tests to determine the influence of the particle-size distribution have been performed within a research project funded by the German Research Foundation (DFG).
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