Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7044743 | Applied Thermal Engineering | 2018 | 39 Pages |
Abstract
In order to examine and predict the enhancement of heat transfer performance under ultrasonic vibration, experimental tests were carried out and empirical correlations have been developed in this study. A stainless-steel circular heater rod was first tested for heat transfer performance with and without ultrasonic vibration in a thermostat water tank. The loaded heat flux was about 7.6â¯Ãâ¯103-7.1â¯Ãâ¯104 W/m2, which covered the heat transfer regimes from natural convection to subcooled boiling. The size of water tank was 165â¯Ãâ¯310â¯Ãâ¯100 mm, and the liquid subcooling was controlled as 50-70â¯K during the tests. The ultrasonic vibration was generated by three transducers attached to the tank bottom with a total power of 150â¯W and an ultrasonic frequency of 40â¯kHz. Effects of height, heat flux and liquid subcooling were investigated and analyzed. In the present test ranges, the maximum heat transfer increment can be up to 1557â¯W/m2 K, and the maximum h-increment ratio can be about 3.01 (301%). Furthermore, the present data were used to develop empirical correlations for heat transfer enhancement, and the present correlations can predict the experimental database with an averaged error of 14.1%. The present study can provide the experimental evidences and a prediction method for heat transfer enhancement under ultrasonic vibration.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Shao-Wen Chen, Fang-Chin Liu, Hsiao-Jou Lin, Pei-Syuan Ruan, Yu-Ting Su, Yu-Chi Weng, Jong-Rong Wang, Jin-Der Lee, Wei-Keng Lin,