Abstract: Pipes with V shape riblets were tested at Reynolds numbers between 5×103 and 4×104 . All riblet pipes indicated some drag reduction. The model with h = 0.55 mm and h/S = 0.483 ...

Abstract: The discharge coefficients of critical Venturi nozzles were measured for CO2 and SF6 on the Reynolds number range from 3×103 to 2×105. The results showed that the measured discharge ...