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界面现象 及传热
ESCI SJR: 0.146

ISSN 打印: 2169-2785
ISSN 在线: 2167-857X

Open Access

界面现象 及传热

DOI: 10.1615/InterfacPhenomHeatTransfer.2015012160
pages 301-324

NUMERICAL SIMULATION OF THE EFFECT OF CONTACT ANGLE ON THE THERMAL RESPONSE OF THE SOLID DURING NUCLEATE POOL BOILING

Eduardo Aktinol
Henry Samueli School of Engineering and Applied Science, Mechanical and Aerospace Engineering Department, University of California, Los Angeles, California 90095, USA
Vijay K. Dhir
Mechanical and Aerospace Engineering Department, Henry Samueli School of Engineering and Applied Science, University of California, Los Angeles, Los Angeles, California 90095, USA

ABSTRACT

Due to the complex nature of the subprocesses involved in nucleate boiling, it has not been possible to develop comprehensive models or correlations despite decades of accumulated data and analysis. More recently, numerical simulations of the boiling process have proven to be capable of reliably predicting bubble dynamics and associated heat transfer by showing excellent agreement with experimental data. However, most simulations decouple the solid substrate by assuming constant wall temperature. In the present study complete numerical simulations of the boiling process are performed-including conjugate transient conduction in the solid substrate. Finite difference scheme is used to discretize the governing equations in the liquid, vapor, and solid phases. The interface between liquid and vapor phases is tracked by a level set method. An iterative procedure is used at the interface between the solid and fluid phases. Near the three-phase contact line, temperatures in the solid are observed to fluctuate significantly over short periods. Predicted transient temperature and local heat flux results show good agreement with the experimental data available in the literature. The results also show that growth period, departure diameter, and waiting period depend on contact angle. The functional relationship between bubble release frequency and contact angle is found to agree well with empirical correlations reported in the literature.