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Introduction to stress and surface tension
CHEE 3363 Spring 2014 Handout 03
�1
Learning objectives for lecture
1. "
2. "
3. "
4. "
5.
�2
δA
δFn
δFt
δF
Normal stress:
Tangential or shear stress
stress tensor T
�3
Stress is a tensor"
"
z
δFx
δFy
δFz
�4
z
τxy
τxz
σxx
δAx δAx
Calculation of force on a surface
�5
�6
δl
δα
δx
δy
δFx
δv
Force
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"
- "
"
"
"
- Units:!
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�9
t w
μF = 25 lbf."
= 3 ft/s.
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W V h =
L = w ×
10-5 lbf-s/ft2."
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W Lθ
μ V h "
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SGL D =
μ m
"V m.
h
p0
Force Fx
Force F
F
�13
Surface tension!
"
!
"
"
"
θ < 90°θ > 90°
θ
z∆h
�14