Resistance properties of coal-water slurry flowing through local piping fittings
- School of Energy and Environment, Southeast University, Sipailou, Nanjing 210096 (China)
Local resistance characteristics of coal-water slurry (CWS) flowing through three types of piping components, namely gradual contractions, sudden contractions and 90 horizontal bends, were investigated at a transportation test facility. The results show that CWS exhibits different rheological behaviors, i.e., the shear-thinning, Newtonian, and shear-thicken, at different shear rates. When CWS flows through the gradual contractions, the local pressure loss firstly decreases to a minimum, and then increases as the gradual contraction angle ({theta}) increases. When the CWS flow through the sudden contractions, with the increase of pipe diameter ratio ({beta}), the local pressure loss increases for the two kinds of CWS, SHEN-HUA (S-H) CWS and YAN-ZHOU (Y-Z) CWS whose mass concentration range from 57% to 59% and 59% to 62%, respectively. For 90 horizontal bends, there is an optimal value of the bend diameter ratio (Rc/D) at which the local pressure loss is the least. Furthermore, the local resistance coefficient (K) in the empirical correlations is determined from the experimental data. The correlations show that as Re increases, K of the three fittings declines quickly at first. However, with further increase in Re, K shows different behaviors for the three fittings due to the special rheological property of CWS at higher shear rates. The factors of {theta}, {beta} and Rc/D have minor effects on K. (author)
- OSTI ID:
- 21195814
- Journal Information:
- Experimental Thermal and Fluid Science, Vol. 33, Issue 5; Other Information: Elsevier Ltd. All rights reserved; ISSN 0894-1777
- Country of Publication:
- United States
- Language:
- English
Similar Records
Study of unsteady flow conditions for slurry fuels
Flow studies of highly loaded coal-water mixtures around bends and across horizontal sections. [Pressure loss with 90-degree bends and sweep bends]