Qhov sib txawv tseem ceeb ntawm compressible thiab incompressible fluids yog tias cov compressible fluids tshwm sim nyob rau hauv kev muaj tiag whereas cov incompressible fluids yog ib lub tswv yim tsim kom yooj yim ntawm kev xam.
Cov kua dej yog cov pa roj lossis cov kua dej uas ua rau lub thawv ntim. Hauv cov dej dynamics, qhov compressibility ntawm cov kua yog qhov tseem ceeb heev. Nyob rau hauv qhov xwm txheej, tag nrho cov kua yog compressible, tab sis peb txhais cov kua incompressible rau peb txoj kev yooj yim ntawm kev kawm. Cov ntsiab lus ntawm compressible thiab incompressible fluids ua lub luag haujlwm tseem ceeb hauv kev lag luam xws li dej dynamics, kua dej statics, aviation thiab ntau lwm yam. Yog li ntawd, nws yog ib qho tseem ceeb kom muaj kev nkag siab zoo ntawm cov ntsiab lus ntawm compressibility ntawm cov kua kom nkag siab txog cov teb no.
Cov kua Compressible yog dab tsi?
Txhua cov dej uas peb ntsib hauv peb lub neej txhua hnub yog compressible. Txhawm rau nkag siab tias cov kua compressible yog dab tsi, ib tus yuav tsum xub nkag siab tias compressibility yog dab tsi. Lub compressibility ntawm cov kua yog txo qhov ntim ntawm cov kua vim yog sab nraud pressures ua rau nws. Conversely, ib tug compressible kua yuav txo nws ntim nyob rau hauv lub xub ntiag ntawm sab nraud siab. Yog li ntawd, peb tuaj yeem siv qhov ntsuas qhov ntsuas ntawm qhov compressibility raws li qhov sib txawv ntawm qhov hloov pauv ntawm cov kua hauv cov lus teb rau kev hloov siab.
Lub cim rau compressibility yog β lossis κ. Li no, peb tuaj yeem txhais qhov compressibility lej raws li
κ=(-1/v) ∂V/∂p, qhov twg V yog ntim thiab p yog lub siab.
Hauv kev muaj tiag, txhua qhov roj yog compressible heev, tab sis cov kua tsis yog compressible heev. Yog li ntawd, peb tuaj yeem txhais cov compressibility hauv ob hom; adiabatic thiab isothermal compressibility.
Daim duab 01: LPG Lub tog raj kheej muaj cov roj compressed
Lub adiabatic compressibility piav qhia txog qhov compressibility ntawm lub kaw lus thaum qhov kub ntawm qhov system tas li. Peb tuaj yeem pom nws los ntawm βV Whereas, lub isothermal compressibility yog hais txog compressibility ntsuas nyob rau hauv tsis muaj zog hloov ntawm lub cev thiab ib puag ncig. Peb tuaj yeem pom nws los ntawm βS Txij li cov txheej txheem adiabatic kuj yog isentropic, cov txheej txheem no yog txheej txheem entropy tas li.
Dab tsi yog Incompressible Fluids?
Cov kua dej tsis sib haum yog cov kua dej uas muaj tseeb, uas cov kws tshawb fawb tau qhia kom yooj yim ntawm kev suav. Cov kua dej tsis sib haum yog cov kua dej uas tsis hloov lub ntim ntawm cov kua dej vim yog lub siab sab nraud. Feem ntau ntawm cov kev suav yooj yim uas peb ua hauv cov dej dynamics nyob ntawm qhov kev xav tias cov kua dej tsis txaus.
Qhov kwv yees ntawm incompressibility tau txais rau feem ntau ntawm cov kua dej vim lawv compressibility tsawg heev. Txawm li cas los xij, qhov compressibility ntawm gases yog siab, yog li peb tsis tuaj yeem kwv yees cov pa roj raws li cov kua dej tsis txaus. Lub compressibility ntawm cov kua incompressible yog ib txwm xoom.
Qhov txawv ntawm Compressible thiab Incompressible Fluids yog dab tsi?
Cov kua compressible tshwm sim hauv kev muaj tiag. Qhov tseeb, tag nrho cov kua uas muaj nyob rau hauv qhov yog compressible. Incompressible fluids yog ib lub tswv yim uas cov kws tshawb fawb tau tsim kom yooj yim rau kev xam. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm compressible thiab incompressible kua. Raws li, qhov sib txawv tseem ceeb ntawm compressible thiab incompressible fluids yog qhov ntim ntawm compressible fluids txo thaum peb siv sab nraud siab, tab sis lub ntim ntawm incompressible kua nyob twj ywm. Tsis tas li ntawd, cov kua dej dynamic xam rau cov kua incompressible yog ib qho yooj yim heev thaum piv rau cov kev suav nrog compressible fluids.
Summary – Compressible vs Incompressible Fluids
Ib lub kua yog roj los yog kua. Peb tuaj yeem categorize cov kua rau hauv ob pawg dav li compressible thiab incompressible kua nyob ntawm seb lawv muaj peev xwm mus undergo compression. Txawm li cas los xij, tsis muaj cov kua dej zoo li no uas tsis ua rau compression. Yog li, lub tswv yim ntawm incompressible kua yog hypothetical. Qhov sib txawv tseem ceeb ntawm compressible thiab incompressible fluids yog hais tias cov compressible fluids tshwm sim nyob rau hauv kev muaj tiag whereas cov incompressible fluids yog ib lub tswv yim tsim kom yooj yim ntawm kev xam.
