Taller Mecanica de Fluidos

 

8. Rhrh Rhrh gi lhkjlg lhkjlgtrj trj `ncgr `ncgrgkm gkmnhi nhi mjlpu mjlpugst gstj j `g ih Cneurh 8, mhimuig pH - pO

RH]J] 





Gigenr puktjs `g rgcgrgkmnh Gigenr rgmjrrn`j (nzqungr`h-@grgmfh) _gsjivgr gmuhmnýk

]WRJ]NMNJKG]   

R8 < R? , R= < R0 , R7 < R3 ]EF?J.68 aK/l=  8nk < 2.2?70 l 

 RO ∟ƽ   F ?2 ( 2.87?0 l)+ ƽ   Fe ( 2.87?0 l)∟ ƽ  F   ?2 ?2 ( 2.?70 l )+ ƽ  Fe ( 2.?2=? l )∟ƽ  JNI ( 2.87?0 l )∟ R  H< 2  R H ∟ RO 2 ) ( 2.87?0 l ) \

0.753230 l

=

 aK  l

8=.70

 < 00.6> aRh

?

\

 

?. Heuh ciuyg ciuyg fhmnh fhmnh hohdj pjr pjr ukh tuogrì tuogrìhh qug gstè Nkminkh`h Nkminkh`h =2´ pjr pjr `gohdj `gohdj `g ih fjrnzjkthi (Cneurh ?). Ih `ncgrgkmnh `g prgsnýk R  prgsnýk R  H ”R  O sg `gog phrmnhilgktg h ih erhvg`h` y phrmnhilgktg h ih crnmmnýk. @grnvg ukh gxprgsnýk hiegorhnmh phrh ih `ncgrgkmnh `g prgsnýk. Gvhiôg ih ih `ncgrgkmnh `g prgsn prgsnýk ýk phrh I phrh I 27 aRh 8222 Rh

H. ]n gi thkqug mjktngkg 87 ae `g hnrg h 62´M, `gtgrlnkg ih prgsnýk gk ih tuogrìh `g hmgntg. RH]J] gigenljs puktjs `g rgcgrgkmnh gigenljs rgmjrrn`j  



Nzqungr`h h `grgmfh rgsjivgljs gmuhmnýk

 RJNI + ƽ  JNI ( 2.57 l ) + ƽ  Fe ( 2.?2 l ) ∟ R HN_27 aRh ∟

>.68

 RJNI.?>27 aRh ∟

>.68 aK 

(

l

l

=

=

 RJNI .?>27 aRh ∟03.028=

) Q ( )

)(

?.36 2.57 l

)∟( 8=.3 ) ( 2.?2 l ) \

Q 0.5= l \

 aK  l

 ? aRh

?

tglpgrhturh gk gi thkqug `gsmngk`g fhsth ?2´M. O. Gi mhlonj gk ∃f muhk`j ih tglpgrhturh RH]J 8  

 

Rihktghljs uk ohihkmg `g Lhsh phrh gi lgrmurnj (Fe)  L nzqungr`h2= l

 

7. Mjksn`grg Mjksn`grg uk ehtj fn`rèui fn`rèuinmj nmj qug sg ush ush gk uk thiigr thiigr `g hutjlýv hutjlývnigs, nigs, mjlj gk gk ih ? ? Cneurh 7. Ijs îlojijs tngkgk èrghs H 8 < 8 ml y H? < 2.0= ct . ]g ojlogh hmgntg fn`rèuinmj mjk se < 2.65 hi nktgrnjr hi glpudhr fhmnh hrrnoh y fhmnh hohdj gi pgqugøj îlojij `gi ih`j nzqungr`j, gigvhk`j igkthlgktg gi îlojij erhk`g `gi ih`j `grgmfj. Wk hutjlývni qug tngkg ukh lhsh `g 8=>.5 siues sg `gog gigvhr mjk gi ehtj.

h) Hi prnkmnpnj, muhk`j hlojs îlojijs gstèk h ih lnslh hiturh (f < 2), mhimuig ih cugrzh C 8 gk kgwtjk (K) qug sg kgmgsnth k gmgsnth phrh sjstgkgr gi pgsj `gi hutjlývni.

]hogljs qug  R<

 C   , kgmgsnthljs fhiihr ih cugrzh (C 8) pjr thktj  C >=.630 K ) ?

<

?

2.20 l

 

< 0>.>6033 K 

o) _gpnth gi mèimuij `gspuîs `g qug gi hutjlývni fh sn`j gigvh`j 56.50 puieh`hs (f < 56.50 nk). Gxprgsg ih ih cugrzh gk kgwtjk (K) ]WRJ]NMNJKG] 

  f