In a particular ancient Roman siphon at Aspendos (in Turkey)where 30cm holes are chipped through a long chain (> 1.5 km) of cemented together 1.0 m^3 stone blocks, some of the (now scattered) blocks show a curious transverse hole from the main water-conducting hole to the outside air. If the...
Looking for information/insights as to why piping that contains sinusoidal roughness patterns (6" diameter pipe, 1/8" wave amplitude, 1/2" wavelength) may have a lower resistance than smooth piping at very low Reynolds Numbers.
tiwanaku
