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FLOWS IN STREAM TUBES CONSERVATION LAWS IN INTEGRAL
FLOWS IN STREAM TUBES CONSERVATION LAWS IN INTEGRAL

... surrounding nodes to be fixed. Next for each pipe connected to the node one balances head loss with pressure/gravity head: here pumps are treated as negative head losses while turbines are treated as positive head losses. This allows us to calculate the flow in each pipe and its direction. One then ...
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... because of which of the following principles this flow rate is the same as through the connected arterioles, capillaries and veins. (a) Poiueselle flow (b) continuity principle (c) Womersley flow (d) conservation of energy (e) none of the above ------------------------------------------------------- ...
< 1 ... 43 44 45 46 47 48 49 50 51 ... 59 >

Turbulence



In fluid dynamics, turbulence or turbulent flow is a flow regime characterized by chaotic property changes. This includes low momentum diffusion, high momentum convection, and rapid variation of pressure and flow velocity in space and time.Flow in which the kinetic energy dies out due to the action of fluid molecular viscosity is called laminar flow. While there is no theorem relating the non-dimensional Reynolds number (Re) to turbulence, flows at Reynolds numbers larger than 5000 are typically (but not necessarily) turbulent, while those at low Reynolds numbers usually remain laminar. In Poiseuille flow, for example, turbulence can first be sustained if the Reynolds number is larger than a critical value of about 2040; moreover, the turbulence is generally interspersed with laminar flow until a larger Reynolds number of about 4000.In turbulent flow, unsteady vortices appear on many scales and interact with each other. Drag due to boundary layer skin friction increases. The structure and location of boundary layer separation often changes, sometimes resulting in a reduction of overall drag. Although laminar-turbulent transition is not governed by Reynolds number, the same transition occurs if the size of the object is gradually increased, or the viscosity of the fluid is decreased, or if the density of the fluid is increased. Nobel Laureate Richard Feynman described turbulence as ""the most important unsolved problem of classical physics.""
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