Abstract: The phenomenon of producing foams from bitumen under a certain condition is called bitumen foaming process, which is the coupling effect of the multi-physical field and the flow field in a certain volume chamber. The foaming performance is affected by the control parameters (pressure, temperature and flow), bitumen physical properties (needle penetration and viscosity) and the structure parameters of the key device parts (the foaming chamber structure type and the nozzle size and position). In order to make high quality foamed bitumen, the essential characteristics of bitumen foaming behavior should be followed. Thus the process control of the multiphase flow coupling field should be accurately executed. Then the bitumen foaming chamber, a key part of bitumen foaming device is deeply studied by analyzing the typical structure forms of foaming chamber world-widely. A novel structure form of foaming chamber is put forward. By utilizing the theoretical and experimental research and analyzing the essential characteristics of bitumen foaming, at the same time, the evaluation indexes of bitumen foaming in the strong fuzzy coupling field are conclude. The mapping discipline between the bitumen foaming characteristics and the foaming chamber structure is constructed.

Key words: Bitumen foaming chamber, Foaming essential characteristics, Foaming evaluation, Foaming mechanism, Mapping principle, Ion source cleaning, Key words：AlCrN, Mechanical property, Microstructure