Coal-Fluid Properties with an Emphasis on Dense Phase. Report No. 3. Transient Analysis of Pressure Pulse in Coal-Water Mixtures

摘要

Tests were conducted on the flow loop for coal-water mixtures in such a way as to change the flow rates in an abrupt manner to simulate a step function behavior. The Micro-Motion signal followed the flow behavior such that over the time of response a true step function was seen. The pressure pulse measured by the pressure transducer in the middle of the vertical test section, however, did show time lag behavior for both the water and coal-water mixture flow perturbation. In an effort to extract some fundamental information from the signal recorded at each second of time, classic control theory was considered. A second order model which permits dampening of the signal of different magnitudes was the model chosen. 2 figures, 1 table. (ERA citation 10:015624)