Fluid FlowLAMINAR AND TURBULENT FLOWLAMINAR AND TURBULENT FLOWThe characteristics of laminar and turbulent flow are very different.To understand why turbulent or laminar flow is desirable in theoperation of a particular system, it is necessary to understand thecharacteristics of laminar and turbulent flow.EO 1.9 DESCRIBE the characteristics and flow velocity profilesof laminar flow and turbulent flow.EO 1.10 DEFINE the property of viscosity.EO 1.11 DESCRIBE how the viscosity of a fluid varies withtemperature.EO 1.12 DESCRIBE the characteristics of an ideal fluid.EO 1.13 DESCRIBE the relationship between the Reynoldsnumber and the degree of turbulence of the flow.FlowRegimesAll fluid flow is classified into one of two broad categories or regimes. These two flow regimesare laminar flow and turbulent flow. The flow regime, whether laminar or turbulent, is importantin the design and operation of any fluid system. The amount of fluid friction, which determinesthe amount of energy required to maintain the desired flow, depends upon the mode of flow.This is also an important consideration in certain applications that involve heat transfer to thefluid.LaminarFlowLaminar flow is also referred to as streamline or viscous flow. These terms are descriptive ofthe flow because, in laminar flow, (1) layers of water flowing over one another at differentspeeds with virtually no mixing between layers, (2) fluid particles move in definite andobservable paths or streamlines, and (3) the flow is characteristic of viscous (thick) fluid or isone in which viscosity of the fluid plays a significant part.TurbulentFlowTurbulent flow is characterized by the irregular movement of particles of the fluid. There is nodefinite frequency as there is in wave motion. The particles travel in irregular paths with noobservable pattern and no definite layers.Rev. 0 Page 17 HT-03
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