Table 2. List of ageing tests performed... | Emerald Publishing

Table 2.

List of ageing tests performed

Test number	Mix water	Viscosity measurement procedure^a	Duration: d	Objective
1	Deionised water	Brookfield viscometer, 3 r/min	24	To characterise the ageing behaviour of polymer fluids prepared using pure water
2	Deionised water	Brookfield viscometer, 20 r/min	31
3	Oxford tap water	Brookfield viscometer, 3 r/min	23	To characterise the ageing behaviour of polymer fluids prepared using hard water
4	Oxford tap water	Brookfield viscometer, 20 r/min	33
5	Deionised water	Marsh funnel	80	To assess the effect of viscosity measurement technique and long-term storage

Test number	Mix water	Viscosity measurement procedure^a	Duration: d	Objective
1	Deionised water	Brookfield viscometer, 3 r/min	24	To characterise the ageing behaviour of polymer fluids prepared using pure water
2	Deionised water	Brookfield viscometer, 20 r/min	31
3	Oxford tap water	Brookfield viscometer, 3 r/min	23	To characterise the ageing behaviour of polymer fluids prepared using hard water
4	Oxford tap water	Brookfield viscometer, 20 r/min	33
5	Deionised water	Marsh funnel	80	To assess the effect of viscosity measurement technique and long-term storage

^a

In the Brookfield viscometer tests, the shear rates experienced by the fluid are 0·66 and 4·4 s⁻¹ for the rotational speeds 3 and 20 r/min, respectively (conversion factor equals 0·22 for spindle LV-1)