IyoNhamba yaReynolds (Re)ndeimwe yematanho akakosha asina chiyero mu fluid mechanics. Inobatsira kutsanangura hukama huripo pakatimasimba asina simba uye masimba ane simbamumvura inoyerera uye inowanzoshandiswa kuona kana kuyerera kwayo kurilaminar, transitional, kana mhirizhonga.

Pakuyera kuyerera kwemvura ne ultrasound, nhamba yaReynolds inokosha nekuti nzira yekuyerera kwemvura inokanganisa zvakanangachimiro chekukurumidza mukati mepombiSezvo chiyereso chekuyerera kwemvura (ultrasonic flow meter) chichiyera kumhanya kwemvura munzira yeacoustic uye chichishandisa ruzivo irworwo kuona avhareji yekumhanya kwemvura, shanduko muprofile yekumhanya kwemhepo inogona kukanganisa kururama kwekuyera.

1. Nhamba yaReynolds chii?

Kana mvura iri mupombi, nhamba yaReynolds inogona kuratidzwa seizvi:

Re = ρVD / μ

kana:

Re = VD / ν

kupi:

• Re= Nhamba yaReynolds
• ρ= kuwanda kwemvura
• V= avhareji yekumhanya kwekuyerera
• D= dhayamita yepombi mukati
• μ= kusimba kunoshanduka
• ν= kusimba kwekinematic

Nhamba yaReynolds haina chiyero.

Kazhinji, pakuyerera kwemvura mupombi yakatenderera:

• Re < anenge 2,300→ Kuyerera kweLaminar
• Re ≈ 2,300–4,000→ Kuyerera kwekuchinja
• Re > vanenge 4,000→ Kuyerera kwemhepo ine nyonganyonga

Izvi zvinhu zvinotungamira pane miganhu chaiyo, nekuti mamiriro chaiwo ekuyerera kwemvura anogona kusiyana zvichienderana ne geometry yepombi uye kusagadzikana.

2. Ndeupi Musiyano Uripo Pakati peLaminar neTurbulent Flow?

Musiyano mukuru ndewekuti kumhanya kunoparadzirwa sei papombi.

Kuyerera kweLaminar

Mukuyerera kwemvura, mvura inofamba nenzira dzakarongeka.

Kumhanya kweprofile kunowanzo onekwa zvakanyanya, ne:

• Kumhanya kwakaderera pedyo nemadziro epombi
• Kumhanya kwakanyanya kuenda pakati
• Profayiro yekukurumidza kweparabolic isingafungidzike

Chirevo chakareruka ndeichi:

Rusvingo → Kumhanya Kwakaderera → Kumhanya Kwakakwirira → Kumhanya Kwakaderera → Rusvingo

Kuyerera Kunotenderera

Mukufamba kwemvura kunenge kusina kurongeka.

Kuchinja-chinja kudiki uye kusanganisa kunoita kuti mafambiro emota ave akati sandara zvichienzaniswa nekuyerera kwemota.

Izvi zvinoreva kuti kugoverwa kwespeed mupombi kunochinja zvakanyanya nenhamba yaReynolds.

3. Sei Izvi Zvichikosha kuUltrasonic Flow Meter?

Chiyero chekuyerera kwemvura chinogadzirwa ne ultrasonic hachiyere zvakananga huwandu hwese hwemvura inopfuura nemupombi.

Pane kudaro, inoyerakumhanya kwemvurauye wobva waverenga mwero wekuyerera kwemvura.

Muchimiro chakareruka:

Mubvunzo = V × A

kupi:

• Q= mwero wekuyerera kwehuwandu
• V= avhareji yekumhanya kwekuyerera
• A= nzvimbo yepakati pemapaipi

Dambudziko nderekuti kumhanya kunoyerwa munzira ye ultrasonic acoustic kunogona kusaenzana neavhareji kumhanya kwepombi yese.

Saka, chishandiso chinofanira kutsanangura hukama huripo pakati peacoustic velocity yakayerwa neavhareji chaiyo yeflow velocity.

Hukama uhwu hunokanganiswa zvakanyanya neprofile yekukurumidza.

4. Nhamba yaReynolds Inochinja Sei Profayiro yeVelocity?

Funga nezvezviitiko zviviri.

Nhamba Yakaderera yeReynolds

Kana Re yakaderera, kuyerera kwayo kunogona kunge kwakaomarara.

Profayiro yespeed yakakombama zvakasimba:

Kumhanya kwepakati > Avhareji yekumhanya > Kumhanya kwepedyo nemadziro

Kana nzira yeacoustic ye ultrasonic ikapfuura nepakati penzvimbo yakati yepombi, kumhanya kwakayerwa kunogona kusiyana zvakanyanya nekufamba kweavhareji kwepakati pechikamu.

Nhamba Yakakwirira yeReynolds

PaRe yakakwira, kuyerera kunova kwakaomarara.

Kusanganisa kunowanzo gadzira chimiro chespeed chakati sandara, kunyange hazvo kumhanya kwacho kuchiramba kuchiderera kumadziro epombi.

Saka kumhanya kweacoustic-path kunogona kuva nehukama hwakasiyana neavhareji yekukurumidza kwepombi.

Ichi ndicho chimwe chikonzero nei ultrasound flow meter isingakwanise kungofungidzira kuti mwero mumwe chete wekukurumidza wakayerwa unogara uchienderana neavhareji yekufamba kwemhepo yakafanana.

5. Nhamba yaReynolds uye Mamita eKuyerera kweUltrasonic eTransit-Time

Pamuchina wekuongorora mafambiro emvura uchishandisa ultrasound panguva yekufamba, mudziyo uyu unoyera musiyano uripo pakati penguva yekufamba kwemvura uchishandisa ultrasound iri kumusoro neiri pasi.

Hukama hwepakutanga hunogona kurerutswa seizvi:

Kumhanya Kwekuyerera ∝ Musiyano weKufamba-Nguva

Kumhanya kwakayerwa kunobatanidzwa nechikamu chekukurumidza munzira ye ultrasonic acoustic.

Zvisinei, mwero chaiwo wekuyerera kwehuwandu hwemvura unoenderana neavhareji yekumhanya kwepombi yese.

Saka, chishandiso chinofanira kubatanidza kumhanya kweacoustic kwakayerwa neavhareji yekumhanya kweavhareji.

Ukama uhwu hunogona kukanganiswa ne:

• Nhamba yaReynolds
• Nzvimbo yenzira yeacoustic
• Huwandu hwenzira dzeacoustic
• Purogiramu yekuyerera
• Dhayamita yepombi
• Kukanganiswa kwekuyerera kwemvura

6. Sei Mhedzisiro Yacho Ichinyanya Kukosha Pakuyerera Kwemvura Kushoma?

Kubva:

Re = ρVD / μ

kana kumhanya kwekuyerera kwemvura kuchiderera, nhamba yaReynolds inodererawo.

Semuenzaniso, sisitimu inoshanda nekufamba kwakanyanya inogona kunge yakagadzira kuyerera kwakazara, nepo sisitimu imwecheteyo inoshanda nekufamba kwakaderera zvikuru inogona kusvika kune transitional kana laminar regime.

Saka, chimiro chespeed chinogona kuchinja zvakanyanya sezvo flow rate ichichinja.

Izvi zvinoreva kuti hukama huripo pakati pe:

Kumhanya kwenzira yeacoustic

uye

Avhareji yekumhanya kwepombi

zvinogonawo kuchinja.

Kune mamwe ma ultrasonic flow mita, izvi zvinogona kuva chinhu chakakosha pakuyera mwero wemvura yakaderera kana kuti mvura ine viscous yakawanda.

7. Sei Kusviba Kwemvura Kuchikosha?

Nhamba yaReynolds ine chekuita nekunaka kwemuviri:

Re = ρVD / μ

Kana viscosity ikawedzera, nhamba yaReynolds inoderera nekuda kwedhayamita, density, uye flow speed yakafanana.

Semuenzaniso, funga nezvemvura mbiri dzinoyerera nepaseji imwe chete kuburikidza nepombi imwe chete:

Mvura → Kusviba kwakaderera → Higher Re

Mafuta anorema → Kusviba kwakanyanya → Re yakaderera

Mafuta anorema anogona kunge aine speed profil yakanyanya kuoneka nekuda kwekusimba kwawo kwakanyanya.

Saka, ultrasonic flow meter imwe chete inogona kuita zvakasiyana pakuyera mvura dzakasiyana, kunyangwe dhayamita yepombi nekumhanya kwekuyerera kwakafanana.

8. Sei Kureba Kwepombi Yakatwasuka Kwakabatana Nenhamba yaReynolds?

Nhamba yaReynolds inobatsirawo kutsanangura kuti nei kureba kwakakwana kwepombi yakatwasuka kwakakosha.

Mushure mekupwanywa kwegokora, vharuvhu, reducer, kana chimwe chinhu chinoiswa, mafambiro emvura anogona kukanganiswa.

Kuyerera kwemvura kunoda daro rakakwana kuti ienderane nechimiro chakasimba.

Maitiro ekugadzira anoenderana nezvinhu zvinosanganisira:

• Nhamba yaReynolds
• Dhayamita yepombi
• Kuoma kwepombi
• Rudzi rwekuvhiringidzika
• Kumhanya kwekuyerera

Kana chiyereso chekuyerera kwemvura che ultrasonic chakaiswa pedyo zvakanyanya nekukanganiswa kwemvura iri kumusoro, kumhanya kweacoustic kwakayerwa kunogona kukanganiswa zvakanyanya neprofile yekukurumidza kusina kuenzana kana kutenderera.

Izvi zvinogona kukonzera zvikanganiso pakuyera.

Ndosaka gwara rekushandisa ultrasonic flow meter ringakurudzira:

Pombi yakatwasuka inokwira kumusoro ≥ 10D

Pombi yakatwasuka pasi ≥ 5D

kupiD ndiyo dhayamita yepombi iri mukati.

9. Nhamba yeReynolds Yakakwirira Inogara Ichitaura Kuti Yakarurama Zviri Nani Here?

Hazvisi hazvo.

Nhamba yakakwira yaReynolds inowanzo ratidza kuyerera kwakashata, asi kururama kwekuyera kunoenderana nezvimwe zvinhu zvakawanda.

Izvi zvinosanganisira:

• Purogiramu yekuyerera
• Kuisa transducer
• Mamiriro epombi
• Kureba kwepombi yakatwasuka
• Hunhu hwechiratidzo
• Kugadziriswa kwenzira yeacoustic
• Hunhu hwemvura
• Kuongororwa kwemamita

Saka, nhamba yaReynolds inofanira kuonekwa sechinhu chakakosha.paramita yemamiriro ekuyerera, pane kuratidza zvakananga kururama kwemuchina wekuyerera kwemvura.

10. Sei Mamita Ekufamba Kwemvura Akawanda Asinganyanyi Kunzwa Kuyerera Kwemvura?

Ichi chimwe chezvakanakira zvakakosha zvekuyerwa kwemvura kuburikidza ne ultrasound kuburikidza ne multi-path ultrasound flow measurement.

Nzira imwe chete yeacoustic inotevedzera kumhanya kwemhepo munzvimbo shoma yepombi.

Chiyero chemagetsi chekufamba kwenzira dzakawanda chinoshandisa nzira dzakasiyana-siyana dzeacoustic panzvimbo dzakasiyana.

Mukufunga:

Nzira Imwe Chete

→ Inoyera kumhanya munzira imwe chete yeacoustic

Nzira Dzakawanda

→ Inoratidza nzvimbo dzakawanda dzepombi

Chishandiso ichi chinogona kushandisa zviyero izvi kuti chiratidze zviri nani kugoverwa kwekukurumidza kwese.

Saka, ma ultrasonic flow meter ane nzira dzakawanda anowanzo shandiswa pakushandisa:

• Maitiro ekuyerera kwemvura akaomarara
• Kunyatsorongeka kunodiwa
• Dhayamita yepombi yakakura
• Kukanganiswa kwemvura kwakaoma kudzivirira

Nhamba yaReynolds inokanganisa kuyerwa kwekuyerera kweropa ne ultrasound nekuti inokanganisahurongwa hwekuyerera kwemvura uye chimiro chekukurumidza mukati mepombi.

Hukama hwakakosha ndehwekuti:

Re = ρVD / μ

Sezvo nhamba yaReynolds ichichinja, kuyerera kunogona kuchinja pakati pemaitiro e laminar, transitional, uye turbulent. Izvi zvinoshandura kugoverwa kwevelocity mupombi uye nokudaro zvinokanganisa hukama huripo pakati pevelocity inoyerwa munzira ye ultrasonic acoustic uye avhareji chaiyo yevelocity yekuyerera.

Kuti zviyerwe kuyerera kwemvura uchishandisa ultrasound, nhamba yaReynolds inofanira kufungwa pamwe chete ne:

Kumhanya kwekuyerera + Kuyerera kwemvura + Dhayamita yepombi + Profile yekuyerera + Kureba kwepombi yakatwasuka + Kurongeka kwenzira yeAcoustic

Kunzwisisa nhamba yaReynolds kunobatsira mainjiniya kuongorora zviri nanimamiriro ekuyerera kwemvura, kuiswa kwesensa, kusava nechokwadi kwekuyera, uye kukodzera kwemuchina wekuyerera we ultrasonic pakushandisa kwakati..