1. The given liquid (about 2 liters of castor oil) is poured into the acrylic tube which is
placed on the stand on which the sensor is fixed with two clamps, as shown in Figure-
3.
The density of the liquid at by Apps Hat Mini" style="background-color: transparent !important; border: none !important; display: inline-block !important; float: none !important; font-style: normal !important; font-variant: normal !important; font-weight: normal !important; font-size: 14px !important; line-height: normal !important; font-family: Verdana, Geneva, sans-serif !important; height: auto !important; margin: 0px !important; min-height: 0px !important; min-width: 0px !important; padding: 0px !important; vertical-align: baseline !important; width: auto !important; text-decoration: underline !important; background-position: initial initial !important; background-repeat: initial initial !important;">room temperature, as given in the Clark’s table, is
ρcastor oil = 961 kg/m3
2. The top clamp of the set-up is fixed at the 0 mark on the graduation tube and the
bottom sensor is clamped at the 40 cm mark. Hence the distance travelled by the ball
S = 40cm = 0.4m
3. The funnel is now placed above the acrylic tube and the aluminium ball is dropped
through the funnel and time taken by it to travel a distance of 40cm is noted and its
velocity is determined. The spheres of marble and acrylic are also dropped into the
tube one by one and time of their travel is also noted.
4. The above trial is repeated 5-6 times and the average time for each sphere is
calculated and the velocity is determined and tabulated in Table-1.
Valuminum = ()
= *.*
*.,% = 0.769 m/s
Vmarble= ()
= *.
-." = 0.2685 m/s
Vacrylic = ()
= *.
-.,* = 0.2667 m/s
5. Viscosity is calculated using Equation-8.
η =
.
!
"/ 2gr% =
0*,1"2-3%4".546--.52,789
"4*.:2" = ,.:,*
2."%- = 0.831
η =
.
!
"/ 2gr% =
0%-2"1"2-3%4".546-*.**,789
"4*.%25, = %.:**
%.,-2, = 0.98
η =
.
!
"/ 2gr% =
0%:,1"2-3%4".5465.%,789
"4*.%22: = %.*-%
%.** = 0.838
The average value of η = 0.883 Ns/m2 or
η = 0.883 Poiseuille (denoted as symbol Pl).
10 Poise = 1 Poiseulle,
or
η = 8.83 Poise
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