So far as air flow in the channel is turbulent and channel section is a ring, to calculate fanning friction factor
one can use Blasius equation :
Finally, the criterial relations between Fanning friction factor f and Metzner-Reed Reynolds number [Re.
The pressure drop of per unit length was transformed into Fanning friction factor f, which is based on the definition as
Nomenclature D = inside diameter of tube f = Fanning friction factor L = length of tube [Re.
out] (t)dt f Fanning friction factor
with static mixing inserts [f.
They related fanning friction factor
with generalized Reynolds number.
The average pressure loss due to friction or wall shear stress is represented by the Fanning friction factor over the one-period module of the duct, and it is determined from
This is due to the fact that even though Fanning friction factor f decreases with the increase in Re this drop is nonlinear, and the corresponding increase in Nu or is not sufficient to make the value of (j/f) large (Huzaayin et al 2009) In other words, the relative frictional penalty increases with Re to limit or reduce enhancement that would yield high area goodness factor Furthermore, as can be seen from Figure 4, (j/f) increases with the increase of period length as Case 1 outperform Cases 2 and 3: likewise.
where f is the Fanning friction factor, R = 30[degrees]/[beta], and
The Fanning friction factor for single-phase flow was correlated as follows:
Current Study Fanning Friction Factor Correlations Cf = C'*[Re.
The collected data were analyzed to obtain single-phase heat transfer coefficients, using modified Wilson plot method, as well as the Fanning friction factor for each plate configuration.