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Search / Korean Journal of Chemical Engineering
HWAHAK KONGHAK,
Vol.33, No.3, 282-291, 1995
석탄-물혼합연료(CWM)의 유동 특성 및 배관에서의 압력 손실
Rheological Characteristics of Coal-Water Mixture Fuel and Pressure Losses in Pipe Flow
노남선, 감광호, 김동찬
석탄-물 혼합연료(CWM)의 유동 성질을 power law model을 도입하여 Haake 점도계로 분석해 본 결과 전단속도가 0.1-512s-1인 범위에서 첨가제를 0.1wt% 이상 혼합한 CWM연료는 모두 pseudoplastic으로 표시되는 비뉴튼 유체의 특성을 나타냈다. CWM의 온도, 석탄의 평균 입경, 첨가제로 사용되는 음이온성 계면활성제의 투입량이 감소할수록 CWM의 겉보기 점도는 증가하였고, 첨가제를 사용하지 않을 경우에 측정되는 yield stress는 석탄 성분의 농도와 석탄 입자의 크기에 따라 차이를 보였다. 석탄의 농도가 줄어들면 CWM은 n=1인 뉴튼유체에 접근하였으며, 첨가제 사용량, 석탄의 평균 입경, 온도가 감소할수록 CWM의 비뉴튼 성질은 증가하였다. 또한 내경이 27.0mm인 파이프로 구성된 test loop에서 측정된 압력 손실은 power law 상수로부터 유도된 관계식에 의해 계산된 수치와 거의 일치하며, 비뉴특 유체에 적용되는 레이놀드 수(N*Re)-마찰 계수(f) 관계식을 사용하여 수평관을 통과하는 층류 상태의 CWM에 대한 압력 손실을 표시할 수 있었다.
The rheological characteristics of coal-water mixture(CWN) fuel, based on the power law model, were investigated using the Haake rotational viscometer, which produced shear rates from 0.1 to 512 s-1. Test results showed that all the slurries exhibited non-Newtonian properties of shear-thinning behavior, i.e., pseudoplastic or yield-pseudoplastic. The slurries become more viscous as the temperature, the mean particle size, and the amount of anionic surfactant were lowered. Furthermore, the yield stress measured in the case of no additive varied with the solid volume fraction and the coal particle size. The CWMs displayed a higher degree of pseudoplasticity with an increase in coal content and with a decrease in the mean size of the coal particles, the amount of additive, and the temperature. The pressure loss data obtained in the CWM test loop were coincided with the calculated values from the correlation based on the power law constants. Also, the generalized Reynolds number(N*Re)-friction factor(f) relationship could be applied to the laminar flow of CWM fuel.
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[Cited By]
  1. Kim SH, Hwang KS, Hong SS, Journal of the Korean Industrial and Engineering Chemistry, 8(4), 640, 1997
  2. Ra HW, Lee SH, Yoon SJ, Choi YC, Kim JH, Lee JG, Korean Chemical Engineering Research, 48(2), 129, 2010
  3. Oh WC, Kim JG, Kim H, Chen ML, Zhang FJ, Zhang K, Choi JG, Meng ZD, Korean Journal of Materials Research, 20(10), 535, 2010
  4. Oh WC, Kim JG, Kim H, Chen ML, Zhang K, Meng ZD, Zhang FJ, Korean Journal of Materials Research, 19(11), 569, 2009
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