Reynold's number Reynold's number represents the ratio of driving force to viscous force. In turbulent flow, the driving force will dominate and in laminar flow the viscous force will dominate. Thus Reynold's number gives an indication as to whether a fluid flow is laminar or turbulent. Laminar flow occurs when a fluid can be pictured as split into thin layers which slide smoothly over each other. The bonds between atoms weaken with increasing temperature.
Time provides opportunities for bond breaking.