Development of force balance model for prediction of bubble departure diameter and lift-off diameter in subcooled flow boiling. (November 2020)

• Record Type: Journal Article
• Authors: Ren, Tingting; Zhu, Zhiqiang; Zhang, Rui; Shi, Jiangwu; Yan, Changqi
• Is Part Of: International journal of heat and mass transfer. Volume 161(2020)
• Publication Date: 2020-11
• Subjects: Subcooled flow boiling -- Bubble departure diameter -- Bubble lift-off diameter -- Force balance model; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2020.120245
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: A force balance model is proposed for bubble departure and lift-off diameter. The variation of forces with the bubble size is analyzed. The modified model is tested against various experimental database. Abstract: Visualization experiments are carried out and bubble departure diameter is obtained for subcooled flow boiling in a vertical narrow rectangular channel. Force balance analysis of a growing bubble is performed to determine the criteria for bubble departure and lift-off. A new mechanistic force balance model for predicting bubble departure and lift-off diameter is developed by modifying the bubble growth rate, bubble contact diameter and bubble contact angles. A detailed variation of forces with bubble size is presented, which is used to explain the bubble behaviors intuitively. Compared with Klausner's and Yun's force balance models, the present model shows a good agreement with experimental data by Zhou, Guan, Okawa and Ren. The results also show that the new model can be used to predict bubble diameters in various geometric channels.