The basic characteristic of static flow instability is that after the system undergoes a slight disturbance, it will spontaneously transfer from the original stable flow operating point to another stable flow operating point or a small fluctuation operating point.
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In the process of two-phase flow, dynamic flow instability is prone to occur at the transition point of the flow pattern—bubbly flow and annular flow.
The first type of density wave pulsation in natural circulation flow instability mainly occurs in areas where the fluid is of low dryness.
The requirements for structural materials in nuclear reaction engineering are ()
A. Good physical and mechanical properties
B. Withstand the reactor and its harsh environment
C. High temperature, large temperature difference and strong radiation field
D. Has a small neutron capture cross section
Radiation in the reactor mainly contains ()
A. alpha and beta particles
B. gamma rays
C. Neutrons and fission products
D. X-ray