Abstract
The rheological study of coal-oil suspensions is very important because of their application in many industries as alternative fuels to petroleum oil. In this work, the flow behaviour of black coal-oil suspension was studied for a range of coal volume fractions from 0.0378 to 0.427. Shear stresses were measured for shear rates up to 200 s−1 using a Weissenberg Rheogoniometer. All the suspensions behaved like non-Newtonian liquids and exhibited significant increases in apparent viscosity on storage. The flow behaviour of both freshly prepared and aged suspensions was able to be described by power-law models. A model similar to that given by Chong was used to establish relation between the relative apparent viscosity and coal volume fraction for freshly prepared as well as all aged suspensions. A correlation was also established between ageing time and maximum coal volume fraction.
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Abbreviations
- a :
-
constant in eq. (9)
- A, B :
-
constants
- K :
-
consistency index, Pa s−n
- n :
-
power-law index
- S :
-
structure
- t :
-
time, hrs
- µ a :
-
apparent viscosity, Pa s
- µ r :
-
relative viscosity
- Ф :
-
volume fraction
- Ф m :
-
maximum volume fraction
- τ :
-
shear stress, Pa
- sus:
-
suspension
- sol:
-
solvent
- σ :
-
standard deviation
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Ghosh, A.K., Bhattacharya, S.N. Rheological study of black coal-oil suspensions. Rheol Acta 23, 195–206 (1984). https://doi.org/10.1007/BF01332075
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DOI: https://doi.org/10.1007/BF01332075