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The thermal entrance length for a fluid with a Prandtl number greater than one will be longer than the hydrodynamic entrance length, and shorter if the Prandtl number is less than one. For example, molten sodium has a low Prandtl number of 0.004, [12] so the thermal entrance length will be significantly shorter than the hydraulic entrance length.
L is the length Re is the Reynolds number and Pr is the Prandtl number. This number is useful in determining the thermally developing flow entrance length in ducts. A Graetz number of approximately 1000 or less is the point at which flow would be considered thermally fully developed. [2]
Here, the bar on the left side of the figure is the mixing length. In fluid dynamics, the mixing length model is a method attempting to describe momentum transfer by turbulence Reynolds stresses within a Newtonian fluid boundary layer by means of an eddy viscosity. The model was developed by Ludwig Prandtl in the early 20th century. [1]
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The length of the clearway may be included in the length of the takeoff distance available. [27] For example, if a paved runway is 2,000 metres (6,600 ft) long and there are 400 metres (1,300 ft) of clearway beyond the end of the runway, the takeoff distance available is 2,400 metres (7,900 ft) long.
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Ireland rugby coach Andy Farrell will head into his secondment with the British and Irish Lions on the back of a narrow win over Australia, the team he intends to bring down on next year’s tour.
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