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A Simple Viscometer for High School and First Years Undergraduate Program Students: Theory and Experiment

Sparisoma Viridi1,*, Sidik Permana1, Wahyu Srigotomo1, Anggie Susilawati2, Acep Purqon1

1Physics Department, Institut Teknologi Bandung, Bandung 40132, Indonesia2Physics Department, Universitas Padjajaran, Sumedang 45363, Indonesia*dudung@fi.itb.ac.id

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Outline

• Background• Theory• System• Results and discussion• Conclusion• References• Implementation

Background

• Measurement apparatus is usually identical with high price.

• No money no knowledge?• Knowledge can overcome lack of facility.• Innovation (based on knowledge) is an asset

for our country in advancing science and education Remember Prof. Fauzi’s talk this morning?

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Background (cont.)

• Experiment about fluid physical properties, usually only density, and some special temperatures.

• How about its viscosity?• What knowledge are needed?

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Theory

• Continuity equation

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ooii AvAv

Theory (cont.)

• Bernoulli principle

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oooiii gyvpgyvp 22

2

1

2

1

Theory (cont.)

• Poiseulli’s law

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QR

Lp

4

8

System

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System (cont.)

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Results and discussion

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0

0.05

0.1

0.15

0.2

0.25

0 40 80 120 160 200 240 280 320

h(m

)

t (s)

Results and discussion (cont.)

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ln h = -0.009t - 1.492R² = 0.993

ln h = -0.017t - 0.326R² = 0.993

-4.8

-4

-3.2

-2.4

-1.6

-0.8

0

0 40 80 120 160 200 240 280 320

lnh

t (s)

Results and discussion (cont.)

• From theory and system:

• Experiment parameters:

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io

oo AL

gRhth

8exp

4

Results and discussion (cont.)

• Then

= 0.374 – 0.707 cP

• Comparison: ηwater ≈ 1 × 10–2 N·s/m2 or 1 cP at about 20 °C [1], 0.894 cP at 25 °C [2], dan 0.868 cP, 0.707 cP, and 0.782 cP [3]

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mAL

gR

m io

o

54 10361.6

8

1

Conclusion

• A simple and price-affordable device as a vis-cometer has been designed.

• Considering its robustness, the result for wa-ter in room temperature is quite good:0.374 – 0.707 cP cP.

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References

• W. E. Gettys, F. J. Keller, and M. J. Skove, “Physics Classical and Modern”, McGraw-Hill Book, New York, International Edition, 1989, p. 343-344.

• V. L. Streeter dan E. B. Wylie, “Mekanika Fluida”, Erlangga, Jakarta, 1986, p. 175.

• M. N. Tajuddin, “Eksperimen Bola Bergerak Mengapung di dalam Pipa untuk Menentukan Viskositas Fluida menggunakan Alat Bantu Kamera Digital”, Tesis Magister, Institut Teknologi Bandung, Indonesia, 2009.

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References (cont.)

• S. Viridi, S. Permana, W. Srigutomo, A. Susilawati, A. Purqon, “A Simple Viscometer for High School and First Years Undergraduate Program Students: Theory and Experiment”, arXiv:1310.7196v2 [physics.pop-ph] 3 Dec 2013

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Implementation: KSM 2013

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Implementation: KSM 2013 (cont.)

• Results?• .. still

analyzing ..

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Thank you