Von Karman ya yi nasara

von karman vortices

Hargitsi ne ba kawai ba a cikin yanayi, duk da haka ka dube shi, amma yana da matukar muhimmanci a cikin yanayi da yawa: don mafi alhẽri Mix daban-daban ruwaye (shi ya sa muka girgiza kofi da madara don Mix su), ko don haifar da mafi girma canja wurin zafi tsakanin. ruwa (muna girgiza kofi don sa ya yi sauri da sauri), da sauransu. A cikin yanayin yanayi ma sun wanzu kuma ana kiran su Von Karman ya yi nasara.

A cikin wannan labarin za mu bayyana duk abin da kuke buƙatar sani game da manyan motocin juji na Von Karma, halaye da mahimmancinsu.

Von Karma vortex Properties

layuka na vortices

Da farko, dole ne mu san kaddarorin da ke ayyana ruwa da yanayinsa. Yawan yawa, matsa lamba ko zafin jiki sauye-sauye ne waɗanda muka fi sani ko kaɗan. Dangane da su da tasirinsu, ana iya bayanin kowane motsi ko motsin ruwa, duk da rikitarwa yana iya zama:

Rashin daidaito

von Karman vortices a cikin yanayin yanayi

Ka yi tunanin wani rafi na iska yana buga wani yanki; idan saurin iska ya yi ƙasa, za mu ga cewa iska tana motsawa "lafiya" a kusa da bayan ƙwallon; Wannan baya kuma ana kiransa "ƙasa" ko "wutsiya" na kwararar ruwa.

A wannan yanayin ana kiran kwararar laminar, wato: eddies ko gabaɗaya da ake kira turbulences ba a yaba, gaskiyar ita ce idan ba tare da tashin hankali komai zai zama mai ban sha'awa ba, a zahiri har ma da Navier-Stokes equations na iya Aikace-aikacen a cikin ilimin halin dan adam, sarrafa jama'a ko ƙirar tsarin ƙaurawar masu tafiya a cikin filayen wasa, da dai sauransu, komai yana da sauƙi idan babu tashin hankali.

Yanzu a ce kowace kwayar iska ta bi wani kwayar iska, da sauransu; akwai adadi mara iyaka na ƙwayoyin cuta tare da layi mai santsi. Bari mu yi tunanin cewa, ga kowane “dalilin”, ba zato ba tsammani akwai kwayar halitta da ba ta bin wannan tsari mai ƙarfi, wato, yana barin yanayin “al’ada”, kodayake da wuya; a zahiri magana, an ce ya faru "marasa kwanciyar hankali". Wannan rashin kwanciyar hankali shine farkon tashin hankali; Tun daga wannan lokacin, sauye-sauyen yanayin yanayin suna bin juna a hankali, tun da kwayar halitta ɗaya ta tura ɗayan don canza alkibla, da sauransu. "dalilin" dalilin da ya sa a farkon wuri.

Hanyoyi na kwayoyin halitta na iya zama daban-daban, daban-daban: canje-canje a hankali sosai a yanayin zafi, matsa lamba ko yawa, har ma da na kowa na asali da ba a san su ba.

Dangane da lissafin lissafi ko tsarin da ke gaba, rashin zaman lafiya yana karɓar sunaye masu zuwa:

  • Rashin kwanciyar hankali na Kelvin-Helmholtz: Yana iya faruwa a cikin ruwa mai ci gaba kamar iska ko ruwa, ko kuma a mahaɗin ruwa biyu ko yadudduka biyu na ruwa iri ɗaya yana tafiya cikin sauri daban-daban.
  • Rayleigh-Taylor rashin zaman lafiya: Mahimmanci a cikin "fall" (rushewa) ko saukowar iska mai sanyi daga yanayin sama. Ko da a cikin "kaifi" tashin iska mai zafi.

Danko

Danko mai yiwuwa sananne ne saboda kowa yana kwatanta ruwa da zuma ko lava, misali, inferring menene danko. Bari mu yi tunanin ta wani kusurwa: A ce muna kan fitilar ababan hawa da motoci gaba da baya; lokacin da hasken zirga-zirga ya zama kore, muna buƙatar ɗan lokaci don motsawa; to: danko shine lokacin amsawa tsakanin kowane mai ɗaukar kaya (1/lokacin amsawa); mafi girma da danko, da guntu lokacin dauki; wato dukkan ruwaye kan tafi tare ko tare.

Yawancin lokaci ana ɗaukar danko azaman ƙarfin juzu'i tsakanin kwayoyin halitta a cikin ruwa. Mafi girma da gogayya, mafi girma da danko. Daga cikin wadansu abubuwa, wannan karfi shine dalilin wanzuwar iyakar iyaka: mafi kusancin iska zuwa saman, ƙananan saurinsa (a cikin hoton da ke ƙasa, ɗan gajeren kibiya yana nuna saurin gudu).

Misali, 'yan paragliders da ma matukan jirgi na jirgin sama sun san cewa lokacin da iska ke kadawa (da haɗari) da ƙarfi, za su iya saukowa, saboda kasancewa "gudu" tare da bishiyoyi yana rage ƙarfinsu sosai.

Ci gaba da misalin ƙwallon da muka ambata a baya, alal misali, idan iskar iska a kan reshe ya kasance gaba ɗaya laminar kuma babu iyakar iyaka (wanda muka rigaya mun sani daidai da cewa babu danko), babu bambanci. matsa lamba tsakanin saman. da kasa na reshe, don haka babu dagawa; jirgin ba zai iya tashi ba; yana da sauki haka. Yawo gaba daya ba zai yiwu ba, amma an yi sa'a kullun yana nan. Har ila yau, ba tare da danko ba, ba za su haifar da tashin hankali ba duk da rashin zaman lafiya.

Tarin kwayoyin halitta ta hanyar ƙananan matsa lamba

kallon yanayi

Lokacin da barbashi (kamar kwayoyin iska) yana cikin ƙananan matsi, yana jan hankalin shi tare da hanzarin da aka samu ta hanyar canjin matsa lamba da aka raba ta yawa. Tare da babban matsi akasin haka ya faru, yana tunkudewa ko turawa.

A cikin yanayin yanayi, Ana kiran wuraren da ke da babban matsin lamba anticyclones, yayin da guguwa ko hadari (Tsarin cyclones na waje kawai a lokuta na musamman) Ana kiran su ƙananan yankuna.. Duk iskar da ke cikin sararin samaniya ko duk ruwan da ke cikin tekunan duniya yana motsawa saboda wadannan bambance-bambancen matsi. Matsi shine uwar dukiyoyi; a gaskiya ma, yawancin sauran masu canji suna shafar canjin matsa lamba: yawa, zafin jiki, danko, nauyi, sojojin Coriolis, inertias daban-daban, da dai sauransu; a haƙiƙa, lokacin da ƙwayar iska ta motsa, yana yin haka ne saboda kwayoyin da ke gaba gare shi ya bar yanki mai ƙarancin matsi, yankin yakan cika nan da nan.

Mun ga dalilai ko rashin zaman lafiya da ke tasowa a cikin kafofin watsa labaru kamar yanayi ko teku, samar da wasu nau'o'in geometric, daya daga cikinsu - batun wannan aikin - shine abin da ake kira Von Karman vortices. Yanzu, da zarar mun fahimci dalilai da sauye-sauyen da ke tsoma baki tare da duk wani motsi na kowane ruwa, a shirye mu ke mu koyi game da wannan takamaiman lissafi na musamman.

Lokacin da iska ke yawo a kusa da kowane Geometry, yana tasowa a kusa da shi, yana haifar da rashin kwanciyar hankali, kamar yadda muka riga muka gani, haifar da tashin hankali; waɗannan ruɗani suna da nau'o'i da siffofi a zahiri marasa iyaka; yawancinsu ba na lokaci-lokaci ba ne; wato ba a maimaita su cikin lokaci. ko sarari, amma wasu suna yi. Wannan shine batun vortices na Von Karman da aka ambata.

Suna samuwa ƙarƙashin ƙayyadaddun yanayin saurin iska da wasu ma'auni na abin da ke aiki azaman cikas.

Ina fatan da wannan bayanin zaku iya ƙarin koyo game da vortices Von Karman, halayensu da mahimmancin yanayin yanayi.


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