K_e_CircularTubeHeader

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K_e_CircularTubeHeader

The K_e_CircularTubeHeader(Re, LoverD, sigma) function returns the expansion coefficient for flow leaving a set of circular tubes.

The inputs are:
Re = Reynolds number in the tube
LoverD = Length of tube to diameter
sigma = ratio of area for flow in all of the channels to area for flow in the header

Note that the expansion coefficient is defined in terms of the velocity in the tubes.

Example:
Re=4000
LoverD=10
sigma=0.4
K_e=K_e_CircularTubeHeader(Re,LoverD,sigma)

{Solution:
K_e = 0.3468
}

Notes:
For Re>3000 the solution from Kays and London (1984) is used for turbulent flow. For Re<2000 the information presented in Webb (2006) is used. From 2000<Re<3000 the result is interpolated between laminar and turbulent.

Minor Losses Index