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Measurement of thermophoretic velocity in surrounding gas of nitrogen or carbon dioxide

Razali, Mohd Azahari and Sapit, Azwan and Mohd Ali, Mas Fawzi and Khalid , Amir and Mohammed, Akmal Nizam (2014) Measurement of thermophoretic velocity in surrounding gas of nitrogen or carbon dioxide. Applied Mechanics and Materials, 554. pp. 686-690. ISSN 1662-7482

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Abstract

Several experiments are conducted under the microgravity condition, which is achieved by a free-fall, for measuring the thermophoretic velocity in surrounding gas of nitrogen and carbon dioxide. PMMA spheres are used as measured particles, which are 2.91μm in mean diameter. The temperature gradient is 10 K/mm and the pressure is the range between 20 kPa and 100 kPa. Velocities of particles are individually measured during 0.25 s of the microgravity condition and the measurements are repeated in order to attain the accuracy by accumulating data. Comparison between obtained experimental results and theoretical predictions are done; the result for nitrogen is consistent with prediction, while a notable discrepancy is found for carbon dioxide. The disagreement is fixed by modifying the tangential momentum accommodation coefficient.

Item Type: Article
Uncontrolled Keywords: microgravity experiment; tangential momentum accommodation coefficient; thermophoretic velocity
Subjects: T Technology > T Technology (General)
Divisions: Faculty of Mechanical and Manufacturing Engineering > Department of Energy and Thermofluid Engineering
Depositing User: Normajihan Abd. Rahman
Date Deposited: 25 Apr 2017 07:53
Last Modified: 25 Apr 2017 07:53
URI: http://eprints.uthm.edu.my/id/eprint/8210
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