Prediction of Friction Pressure for Non-Newtonian Backfilling Pipe-flow Slurry
In mine backfilling, it is of great significance to calculate the slurry pressure loss in the pipeline transportation. In order to seek a simple and efficient method to predict the pressure loss through applying the friction factor correlations, this paper summarized seven friction factor correction models for non-Newtonian flow according to the flow state classication. After that, details on how to utilize the models to predict the pressure loss through a case study were presented. The results show that choosing a proper model is very important, where the practical flow type and conditions should be considered. For Bingham plastic laminar flow, the Darby-Melson and Swamee-Aggarwal model, which are approximations of the Buckingham-Reiner equation, are the first choices since their prediction results are in good agreement with the actual monitoring results of the pressure loss. However, the Danish-Kumar model underestimates the pressure drop and is suitable for flow with a large Hedstrom Number. Besides, monitoring fluctuations for the velocity and pressure loss in practice can be observed due to the slightly changeable slurry mixing proportion, the variability of the aggregate, the particle settling and mild segregation of the slurry during transportation, and the change of the stowing gradient. Finally, the pressure loss prediction for the transition flow region is still an engineering challenge.
Keywords: Non-Newtonian flow, cemented paste backfill, high density backfill, friction factor, pressure loss
LIU L，XIN J，ZHANG B，et al. Basic theories and applied exploration of functional backfill in mines [J]. Journal of China Coal Sciety，2018，43 (7)：1811—1820. (In Chinese)
BAI T F，SONG R Z. Analysis of modern mine filling mining method[J]. World Nonferrous Metal，2018，499 (7)：55—57. (In Chinese)
GAO Q，YANG X B，WEN Z J，et al. Optimization of proportioning of mixed aggregate filling slurry based on BBD response surface method [J]. Journal of Hunan University (Natural Sciences)， 2019，46 (6)：47—55 (. In Chinese)
KANG H P，WANG G F，JIANG P F，et al. Conception for strata control and intelligent mining technology in deep coal mines with depth more than 1 000 m [J]. Journal of China Coal Society， 2018，43 (7)：1789—1800. (In Chinese)
CHENG H，PENG S L，RONG C X，et al. Numerical simulation and engineering application of grouting reinforcement for surrounding rocks of chamber in deep of 1 000 m by L-shaped boreholes[J]. Rock and Soil Mechanics，2018，39 (S2)：281—291. (In Chinese)
JIANG F F，ZHOU H，LIU C，et al. Progress prediction and prevetion of rock bursts in underground metal mines [J]. Chinese Journal of Rock Mechanics and Engineering，2019，38 (5)：956—972. (In Chinese)
SONG S M，YAN S J，LIU X D. Influence of iron ore tailings powder on the performance of high fluidity concrete [J]. Concrete，2017 (11)：77—80. (In Chinese)
KANG Y B，ZHANG H，XU Y. Influence of roughness on drag coefficient along path of power-law fluid turbulence [J]. Gas & Heat， 2018，38 (8)：49—54. (In Chinese)
YU Y，ZHENG W Y，CHENG K，et al. Research on pipe flow resistance loss of high concentration filling materials in coal mine[J]. Safety in Coal Mines，2017，48 (2)：72—75. (In Chinese)
WANG S，ZHAN Q L，WANG X M，et al. Influence of APAM on rheological properties of unclassified tailings paste -like and its pipeline transportation[J]. Journal of Central South University (Science and Technology)，2017，48 (12)：3271—3277. (In Chinese)
WU A X，CHENG H Y，WANG Y M，et al. Transport resistance characteristic of paste pipeline considering effect of wall slip[J]. The Chinese Journal of Nonferrous Metals，2016，26 (1)：180—187. (In Chinese)
CAI S J，WANG H J. Theory and technology of modern filling[M]. Beijing：Metallurgical Industry Press，2012：67—69. (In Chinese)
ASSEFA K M，KAUSHAL D R. A comparative study of friction factor correlations for high concentrate slurry flow in smooth pipes[J]. Journal of Hydrology and Hydromechanics，2015，63 (1)：13—20.
SHAO Y P，GUO L J，CHEN Y，et al. Determination of conveying parameters of coarse aggregate paste filling slurry pipeline based on annular tube test[J]. Nonferrous Metals (Mine Section)，2018，70 (4)：20—23. (In Chinese)
LIU B，LI X B. Study on two-phase flow loop test of high concentration backfill with total phosphorus waste [J]. Gold Science and Technology，2018，26 (5)：615—621. (In Chinese)
- There are currently no refbacks.