Ma flow metres zvishandiso zvakakosha zvinoshandiswa kuyera kuyerera kwemvura negasi mumabasa akasiyana-siyana emaindasitiri nemabhizimisi. Pakati pemhando dzakasiyana dze flow metres dziripo, Doppler flow metres uye transit time flow metres zvinowanzo shandiswa pakuyera kuyerera kwemvura kusingapindike. Kunzwisisa musiyano uripo pakati pemhando mbiri idzi dze flow metres kwakakosha pakusarudza chishandiso chakakodzera zvinodiwa pakuyera kuyerera kwemvura.
MaDoppler flowmeters anoshanda panheyo yeDoppler effect, iyo inosanganisira shanduko mumafungu emafungu ane chekuita nekufamba kwemucherechedzi. Mafungu aya anoshandisa mafungu e ultrasonic anotumirwa muzvinwiwa zvinoyerera. Kana mafungu e ultrasound akasangana nezvidimbu kana mabhubhu mumvura, mafungu emafungu anochinja nekuda kweDoppler effect. Nekuongorora frequency shift, Doppler flow meter inogona kuverenga flow rate yemvura.
Michina yekuyerera kwemvura panguva yekufamba, kune rumwe rutivi, inoshanda nekuyera nguva inotora kuti chiratidzo che ultrasonic chifambe pakati pema transducer maviri. Aya ma flow metres ane masensa maviri anoshanda sema ultrasonic transmitters ne receivers. Imwe sensor inotumira chiratidzo che ultrasonic munzira yekuyerera, nepo imwe sensor ichigamuchira chiratidzo. Time-of-passage flow metres inoona mwero wekuyerera kwemvura nekuyera nguva inotora kuti chiratidzo chifambe kumusoro nekudzika.
Imwe yemisiyano mikuru iri pakati peDoppler nemamita ekuyerera kwemvura (transit flow meters) imhando yemvura yaanokodzera. Mamita ekuyerera kwemvura (Doppler flowmeters) akanakira kuyera mvura ine huwandu hwakawanda hwezvinhu kana mabubbles, zvakaita semvura yakasviba kana slurry, uko zvinhu kana mabubbles zvinogona kukonzera ultrasonic frequency shifts. Kusiyana neizvi, mamita ekupfuura akakodzera zviri nani kune mvura yakachena ine zvinhu zvishoma, zvakaita semvura nemakemikari.
Mumwe musiyano uri pakuiswa uye kuiswa kwe flow meter. Doppler flow meter inoda kuvapo kwezvikamu kana mabubbles mumvura kuti ione nemazvo mwero wekuyerera kwemvura, izvo zvinogona kuderedza sarudzo dzekuisa. Transit time metres, kune rumwe rutivi, inogona kuiswa munzvimbo dzakasiyana-siyana nekuda kwekukwanisa kwayo kuyera mvura yakachena isina zvikamu kana mabubbles emhepo.
Kururama uye kuvimbika zvinhu zvakakoshawo kufunga nezvazvo pakusarudza pakati peDoppler netransit flow metres. Kururama kweDoppler flowmeter kunogona kuganhurirwa kana mvura yacho iine mabubbles akawanda kana kuti huwandu hwezvinhu zvakapwanyika hwakaderera zvakanyanya. Transit flow metres, kune rumwe rutivi, inozivikanwa nekunyatsorurama kwayo pakuyera mvura yakachena, izvo zvinoita kuti ikwanise kushandiswa uko kuyerwa kwekuyerera kwakarurama kwakakosha.
Muchidimbu, maDoppler flow mita uye transit time flow mita anopa mhinduro dzisingapindike dzekuyera mwero wekuyerera kwemvura mumhando dzakasiyana dzemashandisirwo emvura. Kunzwisisa musiyano uripo pakati pemhando mbiri idzi dze flow mita, kusanganisira mashandiro adzo, kukodzera mhando dzakasiyana dzemvura, zvinodiwa pakuiswa uye kururama, kwakakosha pakusarudza flow mita inonyatsokodzera zvaunoda kuyera kuyerera kwemvura. Nekufunga nezvezvinhu izvi, vashandisi vanogona kuita sarudzo dzakangwara kuti vave nechokwadi chekuti kuyerera kwemvura kwakarurama uye kwakavimbika mukushanda kwavo.
Nguva yekutumira: Chivabvu-19-2024