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Ćwiczenie Nr 20 |
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Wyznaczanie lepkości metodą Stokesa |
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0,000070 |
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1 |
Średnica cylindra zawierającego olej cm |
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Pomiary |
rezultaty |
Srednia |
Rśr |
Ri |
Rśr - Ri |
(Rśr - Ri)2 |
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1 |
7,6 |
7,72 |
3,86 |
0,38 |
3,48000 |
60,343450 |
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2 |
7,7 |
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3,86 |
0,385 |
3,47500 |
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3 |
7,8 |
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3,86 |
0,39 |
3,47000 |
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4 |
7,7 |
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3,86 |
0,385 |
3,47500 |
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5 |
7,8 |
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3,86 |
0,39 |
3,47000 |
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2 |
W 2 cm3 wody jest 47 kropel |
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3 |
Droga przebyta przez krople to od 1600mm - 1000mm |
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l = 0,6m |
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Pomiary |
czas |
Pomiary |
czas |
Średnia |
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1 |
15,81 |
11 |
13,03 |
15,5545 |
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2 |
12,57 |
12 |
16,09 |
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dtśr |
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3 |
16,75 |
13 |
15,38 |
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0,728 |
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4 |
20,16 |
14 |
15,37 |
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5 |
16,22 |
15 |
13 |
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6 |
16,25 |
16 |
15,16 |
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7 |
16,78 |
17 |
12,9 |
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8 |
15,71 |
18 |
14,28 |
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9 |
16,22 |
19 |
14,69 |
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10 |
19,47 |
20 |
15,25 |
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4 |
Obliczyć średni promień kropli r |
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4,18879020478639 |
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Obiętość |
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4/3Pi/v |
Promień kropli r |
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0,0435 |
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0,9634 |
0,2182 |
4,1888 |
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0,0435 |
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5 |
Obliczyć średnią prędkość kropli |
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V=l/t |
V=0,6/15,554 |
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0,385740460959851 |
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V=0,386 |
cm/s |
prędkość graniczna |
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6 |
Z prawa Stokesa obliczyć współczynnik lepkości |
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Gęstość oleju 0,871 g/cm3 |
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F=CxV |
335,97994149603 |
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Lepkość |
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0,020845747699039 |
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0,135047086081339 |
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Prędkość graniczna cm/s |
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0,412 |
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