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Assuming ATF is a Newtonian fluid,
I probably have some of my technical vocabulary wrong and silicone oil may not be the best, but let me try to illustrate my concept a little better.Transmission fluid in the sachs transmission increases in viscosity as the shear rate (rpms) increases as in the blue linear (straight) curve below. The bottom curve in red is a non-newtonian fluid that is less linear, but is a lower viscosity than the standard Newtonian curve in blue at lower revs, yet gains viscosity quicker with shear rate (shear thickening). Assuming ATF is a Newtonian fluid, then a non-Newtonian fluid that resembles the red line on the graph, could theoretically develop more torque with more slippage at low rpms and achieve near zero slippage at high rpms.The trick is to find the right fluid, maybe viscous couplng oil? I realize this would probably decrease the 6000 rpm hole shot effectiveness, but it could improve mpg at highway speeds and increase top speed on the salt flats.
This is really a theoretical question at this point I am no expert, of course, but it seems like shear flow rates of the fluid in a torque converter would make a big difference and perhaps the primary variable at play. Don't heavier or lighter hydraulic oils make a difference in torque converter behavior? Wouldn't a Shear Thickening Fluid, such as viscous coupling (silicone) oil, which in effect gets thicker with force applied quicker than other oils make some difference in torque converter function? If shear rates have nothing to do with a torque converter function, what is the action for transmitting the rotational energy from one impeller to the other in the donut? Isn't shear rate of a fluid a critical component of overall dynamic viscosity and isn't viscosity important in the torque converter fluid? 'not trying spread heresy over the sacred design of the Sachs Torque converter within the I-Convert.It makes no difference up to the point it impairs performance. The driving force is specific gravity. Torque transmission comes from the energy of the working being flung at the vanes. Shear rate is irrelevant.If the fluid is thick enough and the fluid level is high enough, it won't work as a torque converter at all.just trying to understand if a non newtonian shear thickening fluid, such as silicone oil, could be used to reduce high speed slippage in a torque converter under load.
This is really a theoretical question at this point I am no expert, of course, but it seems like shear flow rates of the fluid in a torque converter would make a big difference and perhaps the primary variable at play. Don't heavier or lighter hydraulic oils make a difference in torque converter behavior? Wouldn't a Shear Thickening Fluid, such as viscous coupling (silicone) oil, which in effect gets thicker with force applied quicker than other oils make some difference in torque converter function? If shear rates have nothing to do with a torque converter function, what is the action for transmitting the rotational energy from one impeller to the other in the donut? Isn't shear rate of a fluid a critical component of overall dynamic viscosity and isn't viscosity important in the torque converter fluid? 'not trying spread heresy over the sacred design of the Sachs Torque converter within the I-Convert.just trying to understand if a non newtonian shear thickening fluid, such as silicone oil, could be used to reduce high speed slippage in a torque converter under load.