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EFFECT OF SURFACE TEXTURES ON PARALLEL
SLIDING SURFACES
Presented by
Syed Ismail
Department o !e"#ani"al En$ineerin$
Indian Instit%te o Te"#nolo$y ara$p%r
Pro !i#ir Saran$i
Under t#e $%idan"e o
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O'ER'IE( OF PRESENTATION
2
INTRODUCTION
STATE OF T)E ART
O*+ECTI'ES
T)EOR,
!ES) CON'ERGENCE AND 'ALIDATION OF NU!ERICAL SOLUTION
EFFECT OF S-UARE.S)APED TEXTURE INCLUDING FLUID INERTIA
EFFECT OF !ULTI.TEXTURES ON PARALLEL SLIDING SURFACES
CONCLUSION
FUTURE PLAN OF T)E (OR&
REFERENCES
CO!PARISON OF T)E DIFFERENT.S)APES OF TEXTURES
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(#at is meant by !i"ro.Te/t%re0
Deterministi" mi"ro te/t%res are t#e s%ra"e eat%res t#at #a1e spe"ii"
pattern in terms o s#ape2 si3e2 orientation and distrib%tion4
(#at is t#e importan"e o !i"ro.Te/t%re0
Dierent appli"ations o !i"ro.Te/t%re0
Cylinder liner #onin$ to pre1ent sei3ers2 s%ra"es o modern ma$neti"
stora$e de1i"es2 !E!S5!i"ro.Ele"tro.!e"#ani"al Systems6 de1i"es2
!e"#ani"al seals
Dierent met#ods to impro1e Tribolo$i"al perorman"e "#ara"teristi"s
L%bri"ant density "#an$e2 a"e 7a1iness2 radial taper2 #ydro.
pads2 lobes and s%ra"e ro%$#ness
To impro1e t#e Tribolo$i"al perorman"e "#ara"teristi"s4
INTRODUCTION
3
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INTRODUCTION
Ne$ati1e Asperities
Rapid "#an$e in t#e "ross.se"tion2 Synt#eti" Oil2 S%per.laminar
5T%rb%lent6 lo74
Positi1e Asperities
Importan"e o l%id inertia ee"t0
Dierent types o s%ra"e te/t%res0
4
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STATE OF T)E
ART
)amilton et4al 589:;6 Ee"t o s%ra"e irre$%larities on a"e seals
, &li$erman and I Etsion 5
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STATE OF T)E
ART
6
I Etsion et al42 56 E/perimentally in1esti$ate t#e ee"t o partial
te/t%red s%ra"e o1er %n.te/t%red s%ra"e oparallel t#r%st bearin$
)ai7% ,% et al42 5
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STATE OF T)E
ART
7
S C%pillard et al42 5
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O*+ECTI'ES
8
Ee"t o dierent s#apes2 si3e and orientation o positi1e and ne$ati1e
te/t%res 7#i"# "an 1ary t#e perorman"e "#ara"teristi"s o slidin$ "onta"ts4
S@%areRe"tan$%lar Cir"%lar )e/a$onal
Trian$%lar EllipsoidalDome
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O*+ECTI'ES
Ee"t o l%id inertia on te/t%red slidin$ "onta"ts by t7o met#ods
84 Pert%rbation met#od
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T)EOR,T)EOR, OF SURFACE TEXTURE
10
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T#e non.dimensional @%antities are
abo1e t#eprotr%sion
else7#ere
gC hh
C
=
T#e ilm t#i"Bness bet7een t#e parallel s%ra"es or t#e positi1e
te/t%res is
2h
hC
= gg
hh
C=
abo1et#eRe"ess
else7#ere
gC hh
C
+=
T#e ilm t#i"Bness bet7een t#e parallel s%ra"es or t#e ne$ati1ete/t%res is
T)EOR,
11
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T)EOR,
8 abo1e t#e Re"ess
8 else7#ere
gh
h
+=
8 abo1e t#e protr%sion
8 else7#ere
ghh
=
In Non.dimensional orm
12
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T)EOR,
!odiied Na1ier.StoBes e@%ation in"l%din$ t#e l%id inertia ee"t is
u u u u p uu v w
t x y z x y y
+ + + = +
=
p
y
=
w w w w p wu v w
t x y z z y y
+ + + = +
and t#e Contin%ity e@%ation is
( ) ( ) ( )=
u v w
t x y z
+ + + =
T)EOR, OF FLUID INERTIA EFFECT
13
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T#e Non.dimensional @%antities %sed to Non.dimensionali3e t#e Na1ier.
stoBes e@%ation are
T#e non.dimensional orm o t#e steady.state Na1ier.StoBes e@%ation
in"l%din$ t#e l%id inertia ee"t is< =4H=8
=4H 84??9 84?9= 84??9
=4; ?48H?> ?4>H9? ?48>:
=49 8?4=8
=4H 84?9?< 84?9H 84?;H
=4; ?4; ?4= ?48H8
=49 8?4=;>? 8?48>? 8:499
Re LD ( 5Present6 ( 5&aBoty6 ( 5C#en6
=4H: 8
=4< =4H8>? =4H=H: =4H=H8
=4H 84;8H< 84;==9 84?9=
=4; ?4
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25
EFFECT OF S-UARE.S)APED TEXTURE INCLUDING FLUID INERTIA
T#e n%meri"al analysis 7as perormed to determine t#e ee"t o 1ario%s
non.dimensional parameters liBe aspe"t ratio2 te/t%re #ei$#t ratio and
Reynolds n%mber4 T#e limits o t#ese parameters are
Aspe"t ratio 5 6 =48 =49A A
Te/t%re #ei$#t ratio5 6$ =48 =4:$
= Re 84> Red%"ed Reynolds n%mber 5 6Re
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=48 =4< =4F =4> =4H =4:=
=4H
8
84H
=4H =4:=
=4=H
=48
=48H
=4 =4H =4: =4? =4; =49=
=4=H
=48
=48H
=4 =4H =4: =4? =4; =49=
=
:=
;=
8==
8=
8:=
Fri"tionparameter
Aspe"t ratio
EFFECT OF S-UARE.S)APED TEXTURE INCLUDING FLUID INERTIA
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29
CO!PARISON OF DIFFERENT.S)APES OF TEXTURES (IT) FLUID INERTIA
Sl4 No Unit Cell Des"ription !a/im%m Aspe"t ratio
8 S@%are =49
< Cir"%lar =4?;
)e/a$onal =4:H
> Dome =4?;
H Ellipsoidal =4;
: Trian$%lar =4