DISCUSSION อภิปรายผล
• Laminar flow- highly ordered fluid motion with smooth streamlines.
• Transition flow - a flow that contains both laminar and turbulent regions.
• Turbulent flow-a highly disordered fluid motion characterized by velocity and fluctuations and eddies.
According to the Reynolds`s experiment, laminar flow will occur when a thin filament of dye injected into laminar flow appears as a single line. There is no dispersion of dye throughout the flow, except the slow dispersion due to molecular motion. While for turbulent flow, if a dye filament injected into a turbulent flow, it disperse quickly throughout the flow field, the lines of dye breaks into myriad entangled threads of dye.
In this experiment we have to firstly is to observe the characteristic of the flow of the fluid in the pipe, which may be laminar or turbulent flow by measuring the Reynolds number and the behaviour of the flow, secondly to calculate the range for the laminar and turbulent flow and lastly to prove the Reynolds number is dimensionless by using the Reynolds number formula.
After complete preparing and setup the equipment we run this experiment. But firstly we have to calculate the area of bell mounted glass tube, the viscosity of water and the density of water. The density of water is 1000 kg/m³, the area of glass tube is ,while the viscosity of water is , this is done for easy step by step calculation.