I would like to compare the viscosity of "chilled" RP-1 as it is used for Falcon 9 launches to that of some everyday fluids. However, I am unable to find this information elsewhere. Would you please help me out? Thanks a lot!
The table here lists the viscosities of some maybe-not-so-everyday fluids; Falcon fuel is kept twice as viscous as ordinary kerosene at room temperature (1.64 cP), comparable to milk or blood. Water at room temperature is 0.89 cP.
I tried to find a more authoritative reference for the 3.3 cP figure, but had only partial success. Wikipedia gives the fuel temperature for Falcon as 266.5 K (-6.6º C). This NIST document contains extensive information on RP-1's properties, including its kinematic viscosity across a broad range of temperatures -- kinematic viscosity being the ratio of dynamic viscosity to density. Unfortunately, the density information in the document only goes down to 0º C. The temperature-density relationship is very close to linear over the measured range, however, and if I extrapolate the density down to the target temperature I get 0.819 g/cc. The kinematic viscosity for Falcon juice is about 3.7 mm^2/s, implying a dynamic viscosity of 3.7 * 0.819 = 3.0 cP, which is at least in the ballpark of the unreferenced 3.3 cP.