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Startup and transport characteristics of oscillating heat pipe using ionic liquids.
- Source :
-
International Communications in Heat & Mass Transfer . May2018, Vol. 94, p1-13. 13p. - Publication Year :
- 2018
-
Abstract
- This paper attempted to investigate the effects of ionic liquids (ILs) addition on the startup, operation and thermal performance of a closed loop copper oscillating heat pipe (OHP, four turns). The liquid slug oscillation characteristics and flow pattern of the OHP with various heat input were also experimentally examined utilizing high-speed camera. The experimental results showed that for higher ILs mass fractions, the OHP behaved a lower startup power (decrease of 29 W) and startup temperature (decrease of 11 °C), which are favorable of not only facilitating a faster startup of the OHP but also effectively avoiding the “dry-out” problem. When the mass fraction of ILs was 0.67%, the ILs-water based OHP substantially had the same amplitude and the velocity as water-based OHP. When the ILs addition was respectively 19.1% and 44.4% (mass fraction), the oscillation liquid slug displayed a high frequency and small amplitude characteristics. In case of a low mass fraction of ILs, ILs-water based OHP nearly perform the same heat transfer performance as the water based OHP presented. However, the heat transfer performance of the ILs-water based OHP showed a slight decrease of 10% at higher heat input (>220 W), which in general did not affect the overall thermal performance and operational stability of the OHP. A modified correlation of Kutateladze number ( Ku ) was established and could basically predict the thermal performance within approximately ±10% deviation in the vertical closed loop OHP at a filling ratio around 65% considering the effects of ILs addition. [ABSTRACT FROM AUTHOR]
- Subjects :
- *HEAT pipes
*IONIC liquids
*OSCILLATIONS
*HEAT transfer
*THERMAL properties
Subjects
Details
- Language :
- English
- ISSN :
- 07351933
- Volume :
- 94
- Database :
- Academic Search Index
- Journal :
- International Communications in Heat & Mass Transfer
- Publication Type :
- Academic Journal
- Accession number :
- 129336289
- Full Text :
- https://doi.org/10.1016/j.icheatmasstransfer.2018.03.004