Ib tug qauv twisted daim kab xev nyob rau hauv ib tug PTFE raj tsim ib zaug xwb, nruam swirl. Ib qho kev tsim tshiab yuav siv lub tswv yim no ntxiv: nws ib ntus thim rov qab cov kev taw qhia ntawm kev sib tw, yuam cov dej swirling mus rau ntawm phab ntsa, ntuav, thiab tom qab ntawd pib swirling nyob rau hauv qhov sib txawv. Qhov kev cuam tshuam rov qab no ua rau muaj kev txhoj puab heev re-kev sib xyaw thiab ua kom muaj txiaj ntsig zoo rau kev hloov pauv cua sov piv nrog cov khoom siv sib xyaw ua ke.
Qhov tshwm simbidirectional twisted daim kab xev ntxig PTFE rajlub tswv yim sawv cev rau cov kauj ruam tom ntej hauv kev txhim kho thermal, tshwj xeeb tshaj yog nyob rau hauv cov ntawv thov uas muaj tshuaj lom neeg sib raug zoo thiab kev rov ua dua tshiab yog qhov tseem ceeb.
Los ntawm Nruam Swirl mus rau Alternating Vortex Reversal
Ib txwm twisted daim kab xev inserts tsim ib tug khov kho helical txaus nyob rau hauv ib lub raj. Qhov swirl no txo cov txheej txheem thermal ciam teb thiab txhim kho cov cua sov hloov los ntawm kev ua kom cov dej sov nyob deb ntawm phab ntsa thiab hloov nws nrog cov kua dej txias.
Txawm li cas los xij, qhov txiaj ntsig no yog qhov ruaj khov thiab kwv yees tau. Thaum tag nrho tsim, lub swirl mus txog quasi - tus qauv khov kho uas txwv kev sib xyaw ntxiv.
Bi-cov ntaub ntawv qhia kev sib tw hloov pauv tus cwj pwm no los ntawm kev qhia cov ntu sib hloov ntawm lub moos thiab rov qab-clockwise twist. Ntawm txhua qhov kev hloov pauv, cov dej ntws tau raug yuam kom hloov angular momentum kev taw qhia sai.
Flow Physics ntawm Swirl Reversal
Sudden Angular Momentum Disruption
Ntawm txhua qhov kev hloov pauv ntawm clockwise mus rau counter-clockwise twist, lub swirling flow yog sai sai decelerated thiab yuam kom reorganize. Cov kua dej tsis tuaj yeem hloov mus tau yooj yim ntawm kev tawm tsam kev sib hloov, ua rau muaj kev kub ntxhov hauv cheeb tsam.
Cov kua dej yog yuam kom ua lub gymnastic niaj hnub nyob rau hauv lub raj, tsis tu ncua accelerating, decelerating, thiab reorienting nws internal motion qauv.
Qhov no mechanism tsim:
Muaj zog vortex tawg tsam
Local shear txheej instabilities
Kev cuam tshuam ntawm ciam teb ceev ceev
Rov ua dua qhov sib xyaw ntawm cov tub ntxhais thiab ze rau - cov kua phab ntsa
Ciam Txheej Txheej Reformation Cycle
Txoj kev txhim kho tseem ceeb yog kev puas tsuaj rau lub sijhawm thiab kev hloov kho ntawm cov txheej txheem thermal ciam teb. Tsis txhob cia cov txheej txheej insulating ruaj khov los txhim kho ntawm phab ntsa ntawm lub raj, txhua qhov twist thim rov qab scrubs thiab rov pib dua cov dej ntws.
Qhov kev rov tsim dua tshiab ntawm cov ciam teb txheej no ua rau muaj qhov sib txawv nruab nrab ntawm cov cua sov hloov pauv ntau dua piv nrog ib qho -kev taw qhia twisted daim kab xev tsim.
Thermal -Hydraulic Performance Advantages
Txhim kho Thaum tshav kub kub hloov pauv ntawm Kev Nyuaj Siab Tshaj
Covbidirectional twisted daim kab xev ntxig PTFE rajconfiguration feem ntau ua rau siab poob siab dua ib tug du tube vim tsis tu ncua khiav obstructive thiab kev taw qhia kev hloov. Txawm li cas los xij, qhov nce hauv kev hloov hluav taws xob yog qhov tsis sib xws loj dua li qhov nce hauv cov twj tso kua mis.
Qhov no ua rau kev txhim kho tag nrho cov thermal-hydraulic kev ua tau zoo, feem ntau qhia raws li kev hloov hluav taws xob rau ib chav tsev ntawm kev poob siab lossis lub zog nqus dej.
Hauv ntau daim ntawv thov, qhov kev pauv pauv no - tawm yog qhov zoo vim tias:
Thaum tshav kub kub hloov cov kev txwv dominate system kev ua tau zoo
Pumping peev twb muaj nyob rau hauv uas twb muaj lawm systems
Thermal bottlenecks txwv cov txheej txheem dhau los
Kev ua tau zoo nyob rau hauv Transitional Flow Regimes
Bi-cov ntaub ntawv qhia kev sib tw yog tshwj xeeb tshaj yog muaj txiaj ntsig zoo hauv kev hloov pauv Reynolds tus lej, qhov twg ntws tsis yog laminar tag nrho lossis tsis muaj zog.
Nyob rau hauv no regime:
Kev sib xyaw ntuj tsis muaj zog
Cov khaubncaws sab nraud povtseg nyob ib puag ncig ruaj khov
Standard twisted tapes yuav tsis tag nrho destabilize qhov ntws
Cov qauv swirl hloov pauv qhia txog kev cuam tshuam txaus los yuam kom rov hloov pauv mus rau hauv qhov chaw muaj kev kub ntxhov, txhim kho kev ua tau zoo uas cov qauv tsim tsis zoo.
Design Parameters thiab Optimization
Twist Pitch thiab Segment Length
Ob qhov tseem ceeb geometric parameter tswj kev ua haujlwm:
Twist pitch (degree ntawm kev sib hloov ntawm ib chav tsev ntev)
Ntev ntawm txhua qhov taw qhia ntu
Cov ntu luv ua rau cov zaus ntawm swirl thim rov qab, ua kom sib xyaw ua ke tab sis kuj nce siab poob. Cov ntu ntev dua txo qhov poob siab tab sis ua rau tsis muaj zog rau re-cov nyhuv sib xyaw.
Yog li ntawd, optimization yuav tsum sib npaug:
Qhov yuav tsum tau ua kom sov
Pumping zog txwv
Tube khoom txwv
Fouling rhiab heev
Khoom Compatibility nrog PTFE Tubes
PTFE twisted daim kab xev yog feem ntau siv nyob rau hauv chemically aggressive ib puag ncig vim lawv inert xwm. Compatibility nrog acids, chlorides, thiab oxidizing media ua rau lawv haum rau retrofit daim ntaub ntawv nyob rau hauv:
Chemical processing heat exchangers
Electroplating kub tswj systems
Tshwj xeeb ua kua cua sov loops
Vim tias ob lub raj thiab ntxig tuaj yeem yog fluoropolymer-raws li, kev pheej hmoo tshuaj lom neeg raug txo qis.
Retrofit muaj peev xwm nyob rau hauv uas twb muaj lawm kub Exchangers
Ib qho txiaj ntsig tseem ceeb tshaj plaws ntawm bi-kev taw qhia twisted daim kab xev thev naus laus zis yog nws qhov tsim nyog rau cov ntawv thov rov qab siv dua. PTFE raj kub exchangers uas twb muaj lawm feem ntau yuav hloov kho yam tsis muaj kev hloov kho loj.
Cov txiaj ntsig muaj peev xwm muaj xws li:
Ua kom muaj peev xwm thermal tsis nce hneev taw
Txhim kho qhov hluav taws xob kub tswj
Txhim khu kev ruaj ntseg
Txo qhov xav tau ntxiv rau qhov chaw tshav kub hloov pauv
Hauv cov txheej txheem thermally constrained, qhov no tuaj yeem muab tus nqi - txhim kho kev ua tau zoo yam tsis tau hloov pauv tag nrho.
Kev Lag Luam Kev Lag Luam -Off Summary
Thaum lub siab poob nce ntxiv piv nrog cov raj du, tag nrho cov kev ua haujlwm ntawm lub cev feem ntau txhim kho vim:
Muaj zog thiab ntau zaus sib xyaw
Txo thermal tsis kam
Txhim kho phab ntsa kub hloov coefficient
Kev siv zoo dua ntawm thaj chaw uas twb muaj lawm
Qhov no ua rau cov thev naus laus zis tshwj xeeb tshwj xeeb hauv lub zog - txwv lossis chaw - txwv kev lag luam.
Xaus
Bi-cov ntaub ntawv qhia kev sib tw yog ib qho yooj yim tab sis muaj txiaj ntsig zoo nyob rau hauv kev hloov pauv hluav taws xob tsis zoo. Los ntawm kev qhia alternating swirl kev taw qhia nyob rau hauv PTFE hlab, qhov ntws yog rov cuam tshuam, ciam teb cov khaubncaws sab nraud povtseg yog tsis tu ncua rebuilt, thiab thermal mixing yog ho intensified.
Covbidirectional twisted daim kab xev ntxig PTFE rajtxoj hauv kev qhia tau hais tias qhov kev hloov pauv geometry yooj yim npaum li cas tuaj yeem ua rau muaj txiaj ntsig zoo hauv kev ua haujlwm thermal, txawm tias qhov nruab nrab nce hauv siab poob. Hauv ntau lub tshuab, qhov sib npaug no ua rau muaj kev ua tau zoo tag nrho piv nrog cov qauv kev txhim kho.
Raws li cov tshuab hluav taws xob txuas ntxiv xav tau kev ua haujlwm siab dua los ntawm cov khoom siv compact, yav tom ntej cov khoom siv hluav taws xob hloov pauv yuav ua rau muaj kev vam khom rau cov tswv yim uas txhob txwm ua rau cov qauv ntws. Qee lub sij hawm, txoj hauv kev zoo tshaj plaws los txhim kho qhov sib pauv yog khi cov kua hauv cov pob caus thiab cia kev tswj hwm chaos ua haujlwm.
