Qhov sib txawv tseem ceeb ntawm cov txheej txheem isentropic thiab polytropic yog cov txheej txheem isentropic ib txwm qhia tias muaj kev ua haujlwm qis dua, thaum cov txheej txheem polytropic ib txwm qhia tau tias muaj kev ua tau zoo dua.
txheej txheem Isentropic yog txheej txheem thermodynamic uas ob qho tib si adiabatic thiab thim rov qab tuaj yeem pom. Cov txheej txheem Polytropic, ntawm qhov tod tes, yog ib qho txheej txheem thim rov qab ntawm txhua qhov qhib lossis kaw kaw ntawm cov pa roj lossis vapor cuam tshuam nrog cov cua sov thiab ua haujlwm hloov mus rau hauv txoj hauv kev uas tau teev tseg ua ke ntawm cov khoom raug khaws cia thoob plaws hauv cov txheej txheem.
Isenttropic Process yog dab tsi?
Ib txheej txheem isentropic yog txheej txheem thermodynamic uas ob qho tib si adiabatic thiab thim rov qab tuaj yeem pom. Hauv cov txheej txheem no, kev ua haujlwm hloov pauv ntawm qhov system zoo li tsis muaj kev sib txhuam thiab tshwm sim yam tsis muaj kev hloov pauv ntawm tshav kub lossis teeb meem. Qhov no yog cov txheej txheem zoo tshaj plaws uas muaj txiaj ntsig zoo hauv engineering ua qauv rau kev sib piv nrog cov txheej txheem tiag tiag. Peb tuaj yeem ua qhov zoo rau nws raws li cov txheej txheem thim rov qab uas tsis tshwm sim hauv qhov tseeb. Qhov no yog vim hais tias cov txheej txheem uas yog ob qho tib si adiabatic thiab thim rov qab yuav tsum muaj qhov sib npaug ntawm thawj zaug thiab zaum kawg entropies, uas ua rau lub npe hu ua cov txheej txheem isentropic. Txawm li cas los xij, peb tuaj yeem txhais lo lus no rau lwm txoj hauv kev, piv txwv li, qhov system uas muaj nws qhov kev hloov pauv tsis hloov pauv.
Daim duab 01: Hauv T-s (entropy vs. temperature) daim duab ntawm cov txheej txheem isentropic. Ntawm no, qhov entropy tseem nyob tas li
Cov txheej txheem ua kom muaj zog nce lub entropy ntawm ntug. Thaum qhov no tshwm sim, txawm tias qhov system entropy lossis ib puag ncig entropy tuaj yeem nce ntxiv. Cov txheej txheem isentropic tshwm sim thaum qhov system entropy tseem nyob tas li.
Ib txheej txheem adiabatic thim rov qab yog ib qho piv txwv ntawm cov txheej txheem isentropic. Ntxiv mus, qhov tsis tu ncua ntawm cov txheej txheem isentropic yog entropy, equilibrium, thiab tshav kub zog.
Cov txheej txheem Polytropic yog dab tsi?
Ib txheej txheem polytropic tuaj yeem piav qhia raws li cov txheej txheem thim rov qab ntawm txhua qhov qhib lossis kaw cov pa roj lossis vapor cuam tshuam nrog cov cua sov thiab ua haujlwm hloov pauv hauv txoj hauv kev uas tau teev tseg ua ke ntawm cov khoom raug khaws cia thoob plaws hauv cov txheej txheem. Nws tshwm sim nrog kev hloov pauv cua sov. Txawm li cas los xij, qhov hloov pauv cua sov tshwm sim reversibly hauv cov txheej txheem no. Thaum cov roj nkag mus rau hom kev hloov hluav taws xob no, qhov sib npaug hauv qab no muaj tseeb rau cov txheej txheem polytropic.
PVn=tas li
Ntawm no, P yog lub siab, V yog ntim, thiab n yog qhov tas li. Yog li ntawd, txhawm rau tuav PV tas li nyob rau hauv cov txheej txheem polytropic gas expansion / compression, ob qho tib si tshav kub thiab kev ua hauj lwm interchange yuav siv sij hawm qhov chaw ntawm lub system thiab nws nyob ib ncig ntawm. Yog li ntawd, polytropic yog cov txheej txheem tsis yog adiabatic.
Qhov txawv ntawm Isentropic thiab Polytropic txheej txheem yog dab tsi?
Ib txheej txheem isentropic yog txheej txheem thermodynamic uas ob qho tib si adiabatic thiab thim rov qab tuaj yeem pom. Cov txheej txheem polytropic yog cov txheej txheem thim rov qab ntawm txhua qhov qhib lossis kaw kaw ntawm cov pa roj lossis vapor cuam tshuam nrog kev hloov pauv ntawm cov cua sov thiab ua haujlwm. Qhov sib txawv tseem ceeb ntawm cov txheej txheem isentropic thiab polytropic yog tias cov txheej txheem isentropic ib txwm qhia qhov ua haujlwm qis dua, thaum cov txheej txheem polytropic ib txwm qhia tau tias muaj kev ua tau zoo dua.
Cov hauv qab no infographic nthuav tawm qhov sib txawv ntawm isentropic thiab polytropic txheej txheem hauv daim ntawv teev npe rau ib sab ntawm kev sib piv.
Summary – Isentropic vs Polytropic Process
cov txheej txheem Isentropic thiab cov txheej txheem polytropic yog qhov tseem ceeb hauv kev siv lub cev. Cov txheej txheem isentropic yog cov txheej txheem thermodynamic uas ob qho tib si adiabatic thiab thim rov qab tuaj yeem pom. Cov txheej txheem polytropic yog cov txheej txheem thim rov qab ntawm txhua qhov qhib lossis kaw kaw ntawm cov pa roj lossis vapor cuam tshuam nrog kev hloov pauv ntawm cov cua sov thiab ua haujlwm. Qhov sib txawv tseem ceeb ntawm cov txheej txheem isentropic thiab polytropic yog tias cov txheej txheem isentropic ib txwm qhia qhov ua haujlwm qis dua li txheej txheem polytropic.
