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A study of bubble trajectory and drag co-efficient in water and non-Newtonian fluids

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journal contribution
posted on 06.12.2017, 00:00 by Nur Hassan, Mohammad Khan, Mohammad Rasul
A new experimental set-up was used to analyze the characteristics of the bubbles rising in water and three different concentrations of xanthan gum solutions for higher Reynolds number. The bubble size, bubble rise velocity, and bubble trajectory were measured using a combination of non-intrusive-high speed photographic method and digital image processing. The results of bubble trajectory for various bubbles in water and different xanthan gum solutions are presented and discussed. In trajectory analysis, it is seen that the smaller bubbles show helical or zigzag motion and larger bubbles follow spiral motion for water. In xanthan gum solutions, small bubbles experience less horizontal motion than that in water. Larger bubbles produce more spiral motion with the increase in xanthan gum concentration. Drag coefficients for air bubbles at higher Reynolds number are reported . It is seen that the experimental drag coefficient increases with the increase in xanthan gum concentration corresponding to the same bubble volume.

Funding

Category 1 - Australian Competitive Grants (this includes ARC, NHMRC)

History

Volume

3

Issue

3

Start Page

261

End Page

270

Number of Pages

10

ISSN

1790-5087

Location

Greece

Publisher

World Scientific and Engineering Academy and Society

Language

en-aus

Peer Reviewed

Yes

Open Access

No

Era Eligible

Yes

Journal

WSEAS transactions on fluid mechanics.

Exports