class 20 - Internal Flow Click to edit Master subtitle...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Click to edit Master subtitle style 8/13/11 Internal Flow Chapter 8 8.3,4
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
8/13/11 What statement is not true about flow inside cylinders? a) The free stream velocity is best used to determine the Reynold’s number. a) When the flow is fully developed, the velocity profile does not change with distance along the tube. a) Transition to turbulent flow has a lower Re than for external flow. a) The hydrodynamic boundary layer becomes fully developed faster than the thermal boundary layer (i.e., closer to the entrance region) for fluids with a high Prandtl numbers.
Background image of page 2
8/13/11 Fully Developed Conditions Assuming steady flow and constant properties, hydrodynamic conditions, including the velocity profile, are invariant in the fully developed region. The pressure drop may be determined from knowledge of the friction factor f, where, ( 29 2 / / 2 m dp dx D f u ρ ≡ - Laminar flow in a circular tube: 64 Re D f = Turbulent flow in a smooth circular tube: ( 29 2 0.790 1n Re 1.64 D f - = - f ( 29 2 / / 2 m u D dx dp f
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 08/13/2011 for the course CHEM 3210 taught by Professor Degrazia during the Fall '10 term at Colorado.

Page1 / 14

class 20 - Internal Flow Click to edit Master subtitle...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online