Lub twj tso kua mis dej me me yog ib qho cuab yeej nrog ib lub qhov hluav taws xob thiab ib lub qhov hluav taws xob, muaj peev xwm txuas ntxiv tsim lub tshuab nqus tsev lossis lub siab tsis zoo ntawm lub qhov nkag thiab qhov tso zis loj heev ntawm qhov hluav taws xob; nws qhov nruab nrab ua haujlwm yog dej lossis lwm yam kua; thiab nws yog qhov me me. Nws tseem hu ua "cov twj tso kua mis me me," "cov twj tso dej me me," lossis "cov twj tso dej me me."
Cov twj tso kua dej me me no tsuas yog siv hauv kev kho dej, kev tiv thaiv ib puag ncig, kev siv kho mob, kev tswj hwm kev lag luam, thiab cov chaw tshawb fawb tshawb fawb. Lawv yuav tsum tau ua kom tau raws li qhov yuav tsum tau muaj xws li qhov me me, tsis tshua muaj suab nrov, thiab kev siv hluav taws xob tsawg, thiab tuaj yeem siv dav hauv kev nqa, hloov pauv, nias, tshuaj tsuag, txau, dej ncig, thiab xa tawm.
Qhov tseem ceeb ntawm lub twj tso kua mis me me yog qhib qhov dej ntws, lub taub hau nqus, thiab lub taub hau tawm. Cov no tau piav qhia raws li hauv qab no:
Open flow rate: Kuj hu ua "open outlet flow rate." Nws feem ntau yog hais txog tus nqi siab tshaj plaws uas lub twj tso kua dej, tshwj xeeb tshaj yog cov twj tso kua dej me me lossis lub twj tso kua mis me me, tuaj yeem muab tau thaum tsis muaj lub siab ntawm qhov hluav taws xob (piv txwv li, tsis muaj kev tiv thaiv los ntawm li qub, nozzles, nqaim kav, thiab lwm yam, thiab lub twj tso kua mis tsis tas yuav tso tawm lub siab kom kov yeej qhov kev tawm tsam), uas yog, thaum nws "qhib" lossis "qhib."
Nyob rau hauv xws li loads, lub twj tso kua mis ntws tus nqi yuav txo, tsis mus txog nws qhov siab tshaj plaws. Txawm li cas los xij, lub twj tso kua mis tso zis siab yuav nce ntxiv, yog li kev sib ntsib cov ntawv thov xws li tshuaj tsuag, nias, ntxuav tsheb, dej ncig, hloov dej, nqa, thiab yaug. Cov twj no tau siv dav hauv cov chaw kuaj mob, kev tiv thaiv ib puag ncig, thiab kev kho mob. Cov twj tso kua dej feem ntau muaj qhov ntws - qhov nkhaus siab (tseem hu ua ntws- taub hau nkhaus lossis Q-H nkhaus). Ob leeg muaj kev sib raug zoo inverse proportional.