![]() ![]() Ultratap Twist makes flow control pouring easier than any other flow control tap on the market. When it comes to pouring small glasses for paddles, flights, samples and small serves, you need flow control to get things to pour without making a mess. Ultratap Twist takes the world’s best laminar flow forward sealing design tap and provides a flow control feature that you can operate with one hand directly from the tap handle. ONE HANDED FLOW CONTROL OPERTATION FROM THE TAP HANDLEĮxperience the ultimate in flow control convenience with a new twist in the design. We couldn't agree more and it's just one more reason why you should add a few to any tap system. I’m thoroughly impressed with the simplicity of the design." Image credit: JoKalliauerįor an entertaining explanation and demonstration of laminar and turbulent flow, check out this video.From the legendary homebrewing equipment pioneer and trailblazer John Blichmann regarding the Ultratap Twist: "I got the twist today! That design is absolutely brilliant. The relative roughness of the pipe is a local parameter which varies depending on how close the flow is to the rough curved edge of the pipe. Outside parameters may also affect the turbulence of the flow.įor example, flow in a closed pipe (famously analysed in Moody’s chart – see below) is dependent on both the Reynolds number and the roughness of the pipe’s inner surface. It occurs between a specific range of Re values within the same flow. The transition regime describes the transition period or phase between laminar and turbulent flow. When the Re value exceeds a level known as the “critical Reynolds number,” the flow becomes fully turbulent. At a certain range of Re values, the flow enters a transition period between the laminar and turbulent flow. d is the characteristic dimension (such as pipe diameter) chosen for the measurementĪt low Re values the fluid flow is laminar.The Reynolds number is defined mathematically as: Although the concept was originally introduced by George Gabriel Stokes in 1851, it was Osborne Reynolds who applied it to the transition phase between the laminar and turbulent flow. The Reynolds number (Re) is a dimensionless value for the ratio between viscous and inertial forces. In this experiment, Reynolds demonstrated that there are two types of flow – turbulent and laminar – and that there is a transition period between them. As the velocity increased, the line of dyed water quickly broke up and diffused into the volume of the tube. Reynolds added a small amount of dyed water to the flow and observed the action of the water at various flow rates.Īt low flow speeds, the dyed layer could be seen as a straight, uninterrupted line through the glass pipe. The experiment involved measuring and observing water flow in a large glass pipe. In 1883, his first publication on the properties of water motion through parallel channels appeared in the proceedings of the Royal Society of London. He first noticed the distinction between turbulent and laminar flows in the latter half of the 1800s. History of Laminar Flowġ9th-century scientist Osborne Reynolds specialised in the study of fluid dynamics. As the water flow accelerates due to gravity the contrast shows up as rough, foamy, choppy flow (turbulent flow). The smooth, clear flow of some of the slower-moving water (laminar flow) can be seen as large sheets of clear water flowing over the top of the waterfall. As the velocity increases, it reaches a threshold at which the flow begins to act turbulently.īoth types of flow can be seen in some waterfalls. Laminar flow can only be maintained at lower velocities. The laminar state of the flow leads to relatively high momentum diffusion with reduced momentum convection. The absence of any eddy currents, cross-currents, or swirls means that the flow is perfectly laminar. ![]()
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