The following options for heat transfer coefficients are available in the fiber model to compute the exchange of heat between fibers and surrounding flow:
const-htc
A constant value for the heat transfer coefficient in SI units can be specified.
kase-matsuo-1
A heat transfer coefficient based on a model from Kase and Matsuo [
3] that considers pure parallel flow, see Equation
2.8-3.
(2.8-3)
kase-matsuo-2
A heat transfer coefficient based on a model from Kase and Matsuo [
3] that also considers cross flow, see Equation
2.8-4. Refer to Section
2.6.1 for definitions of the variables below.
(2.8-4)
gampert
A heat transfer coefficient based on a model from Gampert [
2].
Gampert provided analytical and numerical solutions for laminar axisymmetric flow of a moving cylinder in stationary air including strong curvature effects in the boundary layer, [
2]. The drag coefficient and the Nusselt number are shown as dimensionless groups in Figure
2.8.1. This correlation is recommended for laminar flows.
user-defined
A heat transfer coefficient that you specify in a user-defined function (UDF). See Section
3.7 for more information on using UDFs in the fiber model.
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![Nu_d = \frac{\alpha d_f}{\lambda} = 0.42 Re_d^{0.334} \left[ 1+ \left({\frac{8 u_{lat}}{u_f-u_{par}}}\right)^2 \right]^{1/6}](img160.gif)