Abstract
There is still not enough knowledge of thermal-fluid characteristics in helically coiled tube under flow instability condition. In this investigation, experiment was conducted by using a natural circulation loop with liquid nitrogen as working fluid. The test section was helically coiled tube and had 4 mm in inner tube diameter, 100 mm in coil diameter and 3150 mm in heated length. The experimental condition was inlet throttle valve K_<in> = 540, 1076, 2065, and system pressure p_<ex> = 0.3, 0.5 MPa. As an experimental result, a inlet flow rate, boiling heat transfer and critical heat flux had been evaluated including post-dryout condition.
