先进材料疑固实验室 Momentum transfer Laboratory of Advanced Materials Solidification Turbulent and laminar flow(Reynolds Number) Laminar flow Turbulent flow Re=pvl 光滑管流：2100~2300 L Re临 边界层流：6×104~3.2×105 aterials So Recritical=2100~2300,tube flow 6x104~3.2x105,surface flow 上浒充通大学 SHANGHAI JIAO TONG UNIVERSITYMomentum transfer Turbulent and laminar flow (Reynolds Number) Laminar flow Turbulent flow µ ρvl Re =    × × = 4 5 6 10 3 2 10 2100 2300 ~ . ~ Re 边界层流： 光滑管流： 临 Recritical= 2100~2300, tube flow 6x104~3.2x105 , surface flow