Characterization of variable thermal contact resistance in rapid contact solidification utilizing novel ultrasound technique英文电子书.pdf

Characterization of Variable Thermal Contact Resistance in Rapid Contact Solidification F. J. Hong School of Mechanical and Power Engineering, Utilizing Novel Ultrasound Shanghai Jiao Tong University, Shanghai, China Technique H.-H. Qiu1 Department of Mechanical Engineering, A method based on a novel ultrasound technique and inverse heat transfer analysis was Hong Kong University of Science and developed to study the transient thermal contact resistance (TCR) at the early stage of a Technology, rapid contact solidification process. This promising technique is nonintrusive and, there- Kowloon, Hong Kong, SAR China fore, provides no distortion to the contact surface as well as the heat transfer process. e-mail: meqiu@ust.hk The effects of impact velocity and initial molten metal temperature on TCR were inves- tigated in detail. An empirical equation that correlates the variable TCR with the initial and interfacial conditions was introduced utilizing the experimental data. DOI: 10.1115/1.2724848 Keywords: ultrasound, heat transfer, rapid contact solidification, thermal contact resistance Introdu