Liquid metals properties

A sodium-potassium alloy (78 percent K) is to be circulated through in.-ID tubes in a reactor core for cooling. The liquid-metal inlet temperature and velocity are to be SSO F and 32 ft/s. If the tubes are 3 ft long and have an inside surface temperature of 720° F, find the coolant temperature rise and the energy gain per pound of liquid metal. Properties of NaK (78 percent K) are as follows ... 

Physical Properties of the Rare Earth Metals TABLE 12. Liquid Metal Properties near the Melting Point... 

Liquid Metal Properties Near the Melting Point... 

Table 2.1 Required liquid metal properties for fast neutron reactors [2]...

The majority of testing for project Prometheus was conducted in MSFC s Early Flight Fission Test Facility (EFF-TF) located in Building 4655. Limited work was also performed in glovebox setups outside of EFF-TF for liquid metal property Studies, heat pipe filling, and manufacturing. 

Chemical Properties. Molybdenum has good resistance to chemical attack by mineral acids, provided that oxidizing agents ate not present. The metal also offers excellent resistance to attack by several liquid metals. The approximate temperature limits for molybdenum to be considered for long-time service while in contact with various metals in the hquid state ate as follows ... 

For turbulent flow of a fluid past a solid, it has long been known that, in the immediate neighborhood of the surface, there exists a relatively quiet zone of fluid, commonly called the Him. As one approaches the wall from the body of the flowing fluid, the flow tends to become less turbulent and develops into laminar flow immediately adjacent to the wall. The film consists of that portion of the flow which is essentially in laminar motion (the laminar sublayer) and through which heat is transferred by molecular conduction. The resistance of the laminar layer to heat flow will vaiy according to its thickness and can range from 95 percent of the total resistance for some fluids to about I percent for other fluids (liquid metals). The turbulent core and the buffer layer between the laminar sublayer and turbulent core each offer a resistance to beat transfer which is a function of the turbulence and the thermal properties of the flowing fluid. The relative temperature difference across each of the layers is dependent upon their resistance to heat flow. 

It follows that since the addition of metal oxides has such a profound effect on the properties of liquid silicates such as the viscosity, that the Reynolds number of liquid silicates in metal-silicate liquid two-phase systems will influence the boundary layer thickness to a greater extent than in the liquid metals and alloys, mainly because of the higher viscosity of the silicate. 

Catalysis and Surface Properties of Liquid Metals and Alloys, Yoshisada Ogino... 

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