Download presentation

1
**Week # 2 MR Chapter 2 Tutorial #2**

To be discussed on Jan. 28, 2015. By either volunteer or class list. MARTIN RHODES (2008) Introduction to Particle Technology , 2nd Edition. Publisher John Wiley & Son, Chichester, West Sussex, England.

2
**Motion of solid particles in a fluid**

For a sphere Stoke’s law

3
**Standard drag curve for motion of a sphere in a fluid**

4
**Reynolds number ranges for single particle drag coefficient correlations**

At higher relative velocity, the inertia of fluid begins to dominate. Four regions are identified: Stoke’s law, intermediate, newton’s law, boundary layer separation. Table 2.1 (Schiller and Naumann (1933) : Accuracy around 7%.

5
**Single Particle Terminal Velocity**

6
Special Cases Newton’s law region: Intermediate region:

7
**To calculate UT and x (a) To calculate UT, for a given size x,**

(b) To calculate size x, for a given UT, Independent of UT Independent of size x

8
**Particles falling under gravity through a fluid**

Method for estimating terminal velocity for a given size of particle and vice versa

9
**Non-spherical particles**

Drag coefficient CD versus Reynolds number ReP for particles of sphericity ranging from to 1.0

10
**Effect of boundaries on terminal velocity**

When a particle is falling through a fluid in the presence of a solid boundary the terminal Velocity reached by the particle is less than that for an infinite fluid. Following Francis (1933), wall factor ( ) Sand particles falling from rest in air (particle density, 2600 kg/m3)

12
**Limiting particle size for Stoke’s law in water**

13
**Limiting particle size for Stoke’s law in air**

14
850

25
**Where the plotted line intersects the standard drag curve for a sphere (y = 1), Rep = 130.**

The diameter can be calculated from: Hence sphere diameter, xv = 619 mm. For a cube having the same terminal velocity under the same conditions, the same CD vesus Rep relationship applies, only the standard drag curve is that for a cube (y = 0.806)

Similar presentations

OK

Monroe L. Weber-Shirk S chool of Civil and Environmental Engineering External Flows CEE 331 June 25, 2015 CEE 331 June 25, 2015

Monroe L. Weber-Shirk S chool of Civil and Environmental Engineering External Flows CEE 331 June 25, 2015 CEE 331 June 25, 2015

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on aravind eye care system Ppt on parallel lines Teamwork for kids ppt on batteries Ppt on history of australia colony Ppt on foundation course Ppt on introduction to object-oriented programming for dummies Pptm to ppt online converter Ppt on lead poisoning Gi anatomy and physiology ppt on cells Training ppt on customer service