Sludge Formation Analysis in Hydraulic Oil of Load Haul Dumper 811MK V Machine Running at Elevated Temperatures for Bioenergy Applications

Table 7

Correlation and regression analyses between viscosity and shear rate.

Sample	Correlation coefficient of shear stress and shear rate			Regression coefficient of shear stress and shear rate
	40°C	60°C	80°C	R square			Standard error
				40°C	60°C	80°C	40°C	60°C	80°C
0	0.0888	−0.2938	0.4909	0.0078	0.0863	0.2409	0.0027	0.0024	0.0031
250	0.4385	−0.0870	0.2434	0.1923	0.0075	0.0592	0.0031	0.0021	0.0034
500	−0.3223	−0.3929	0.6089	0.1038	0.1543	0.3707	0.0020	0.0024	0.0038
750	0.1845	−0.2571	0.4150	0.0340	0.0660	0.1721	0.0029	0.0028	0.00326