Abstract
AbstractA steady, laminar, isothermal flow of non‐Newtonian fluids in the entrance region of an annulus has been studied experimentally. The axial pressure distributions, as well as the excess pressure energy, in the developing flow region are presented. The loss coefficients are found to increase with increasing flow behavior index for inelastic power law fluids. The experimental values of the loss coefficients are about 20% lower than those predicted from the boundary‐layer approximation method presented earlier. A preliminary result indicates that the entrance loss for a viscoelastic fluid is much smaller than that for the inelastic fluid of the same flow behavior index.
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