Vim tias nws yuav siv sijhawm tsis kawg rau cov txheej txheem thim rov qab kom tiav, cov txheej txheem thim rov qab zoo kawg yog ua tsis tau. Txawm li cas los xij, yog tias qhov kev hloov pauv tau teb sai dua li qhov hloov pauv, qhov kev sib txawv ntawm kev thim rov qab tuaj yeem ua tsis tiav.
Puas yog cov txheej txheem thim rov qab tuaj yeem ua tau?
Cov txheej txheem thim rov qab yog cov txheej txheem zoo tshaj plaws uas tsis muaj tshwm sim, thaum cov txheej txheem rov qab tsis tau yog cov txheej txheem ntuj tsim uas feem ntau pom nyob rau hauv qhov. Thaum peb rhuav ib nplooj ntawv los ntawm peb phau ntawv, peb tsis tuaj yeem hloov qhov no thiab 'tsis tsim kua muag'. Qhov no yog ib txoj kev irreversible.
Puas yog txheej txheem irreversible ua tau?
Nyob rau hauv cov txheej txheem irreversible, loj pauv tshwm sim los ntawm ib tug finite tshuaj muaj peev xwm sib txawv . Ib qho piv txwv ntawm cov txheej txheem irreversible yog ib qho tshuaj tiv thaiv spontaneous, los yog electrochemical tshuaj tiv thaiv. ΔStag nrho > 0 txhais tau hais tias tsis muaj ib txheej txheem ua tau uas tag nrho cov entropy txo.
txheej txheem twg tuaj yeem thim rov qab?
Qee yam piv txwv ntawm cov txheej txheem thim rov qab yog uniform thiab qeeb qeeb lossis compression ntawm cov kua, xws li cov dej ntws hauv cov turbine, compressor, nozzle, lossis diffuser. Cov txheej txheem thim rov qab yog qhov sib txawv ntawm qhov sib npaug uas tsis muaj (tseem ceeb) sab hauv kub, siab, thiab nrawm hloov.
Dab tsi yog qhov tseeb ntawm cov txheej txheem thim rov qab?
A. Cov txheej txheem thim rov qabmuab qhov chaw ntawm tus nqi qeeb uas nws ib txwm nyob ntawm qhov sib npaug. … Cov kev taw qhia ntawm tus txheej txheem thim rov qab tuaj yeem thim rov qab los ntawm qhov hloov pauv me me tsis kawg hauv qee qhov xwm txheej.
