Effect of water flow characteristics on gypsum dissolution
Department of Civil Engineering, Faculty of Engineering, Hakim Sabzevari University, Sabzevar, Iran
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Accepted: 20 August 2019
Published online: 2 December 2019
Gypsum is one of the karstic rocks with many positive and negative characteristics. The most important defect of these rocks is solubility against water flow. The dissolution phenomenon in gypsum is accompanied by the release of the sulfate ion in water increasing its concentration, gradually. In this research, the effect of water flow temperature (T), Reynolds number (Re) and water head (H) on gypsum dissolution rate was evaluated, experimentally. In all of the experiments, gypsum samples were prepared approximately in the same dimensions and a circular hole was created inside the sample. Results showed that by increasing the temperature above (T a = temperature of the ambient air), the dissolution rate of gypsum was significantly increased. At the end of the experiment, the hole diameter (d) at the temperatures , 1.30, 1.52 and 1.74 has been increased about 90%, 137%, 141% and 148% from the initial hole diameter (di), respectively. The dissolution rate at is about 50% less than the dissolution rate at temperatures to 1.74. Moreover, the increasing rate of the outlet discharge for H/d = 333 is 1.89 times the increasing rate of the outlet discharge for .
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2019