Abstract
The objective of the present study is to reduce the liquid pumping power by controlling the contact angle of the riser surface with the nanoscale surface treatment. The efficiency of a bubble pump is examined depending on the size of the riser, submersion ratio, gas inlet flow rate, and contact angle variations by nanoscale surface coating between 23.7° and 153.8°. By the nanoscale surface coating, the efficiency is improved by 22.5%, 25%, and 18%, respectively, for the 11 mm, 8 mm, and 5 mm risers compared to the uncoated surface. However, the superhydrophobic surface with a contact angle of 153.8° shows a lower efficiency compared to other surfaces due to the reversed liquid vibration flow. The highest efficiency of the liquid pumping power is obtained at the contact angle of 90.3°. An experimental correlation for the dimensionless volumetric liquid flow rate is developed with an error band of ±20%.
| Translated title of the contribution | Reduction of liquid pumping power by nanoscale surface coating |
|---|---|
| Original language | French |
| Pages (from-to) | 8-17 |
| Number of pages | 10 |
| Journal | International Journal of Refrigeration |
| Volume | 71 |
| DOIs | |
| Publication status | Published - 2016 Nov 1 |
Bibliographical note
Funding Information:This work was supported by the Technology Innovation Program (Grant No. 10052926 ) and the Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the (No. 20144010200770 ), Korea Government Ministry of Trade, Industry & Energy.
Publisher Copyright:
© 2016 Elsevier Ltd and IIR
Keywords
- Bubble pump
- Contact angle
- Liquid pumping power
- Nanoscale surface coating
- Reversed liquid vibration flow
- Wettability
ASJC Scopus subject areas
- Building and Construction
- Mechanical Engineering