Those fluids that increase their viscosity with the increase in agitation or pressure under constant temperature are called Shear Thickening Fluids or Dilatant Fluids. ![]() They appear to be thick or viscous but they can be pumped quite easily. Those fluids which reduce their viscosity, when agitation or pressure is increased, keeping temperature constant, are known as Shear Thinning Fluids or Thixotropic Fluids. Most common liquids and gases are Newtonian fluids, such as water, oil and air. Types Of Fluid Newtonian Fluidsįluids in which shearing stress is linearly related to rate of shearing strain are called Newtonian fluids or true liquids, since agitation or pumping at constant temperature does not affect their viscosity or consistency. The kinematic viscosity of a liquid usually decreases with increase in temperature whereas the kinematic viscosity of a gas increases. The kinematic viscosity is highly dependent on temperature. Usually a thin liquid like water has less viscosity as compared to a thick fluid like honey having high viscosity. It can be thought of as fluid friction or internal resistance of a fluid to flow, and specifically the kinematic viscosity measures the resistance to flow of a fluid under the influence of gravity (or some other body force acting on the mass of the fluid). In general it is the "thickness" of a fluid. Pardon my laziness for asking instead of digging through the documentation, but it is possible to tweak the mixture model (change of reference, for instance)? Pointers to applicable starting points would be appreciated.The resistance of a fluid that is being deformed from shear stress or extensional stress is called viscosity. (Why don't I just use this model, you may ask? TREND have problems with viscosities under other pressure/temperature states this is one where TREND worked, but CoolProp didn't) I don't even know how you would setup the apparatus to get some measures under these conditions. Red and green are pure viscosities as reported by CoolProp. mixture model of corresponding states (originally by al-Siyabi for CO2 (2013), from Heriott-Watts), but with Octane as reference component (!), because it has the most mass in this mixture, coded up with a version of TREND before 3.0 (!), I am able to produce this: I think we are narrowing it down to the selection of mixture model and/or calibration of it, and not some artifact numerical error (non-convergence, for instance). ![]() I would try to do some better attempt at debugging, but the numbers after CoolProp.cpp in the error message certainly doesn't seem to be valid line numbers in the source code (maybe after being run through the preprocessor, though). ![]() If I am to speculate wildly, viscosity is probably calculated using some kind of corresponding state model, and if CO2 (or some other light component) is used as a reference, maybe the mass of the Octane component is relatively large, such that the corresponding state is in the solid phase(!). ![]() # CoolProp/CoolProp.pyx in CoolProp.CoolProp._Props_err2 (CoolProp/CoolProp.cpp:39762)() # CoolProp/CoolProp.pyx in (CoolProp/CoolProp.cpp:41504)() # CoolProp/CoolProp.pyx in (CoolProp/CoolProp.cpp:41716)()
0 Comments
Leave a Reply. |
Details
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |