Mocheso oa mocheso o fihlella joang ho fetisa mocheso oa convection?
Lisebelisoa tse futhumatsang mocheso li sebelisa haholo li-convection lipakeng tsa lintho tse peli tse batang le tse chesang ho fumana mocheso, 'me metsi{0}}ho fapanyetsana ka metsi ke o mong oa mekhoa e sebelisoang haholo ea ho futhumatsa mocheso.
Phetiso ea mocheso oa convection ke e 'ngoe ea mekhoa e atileng haholo le ea mantlha ea ho fetisa mocheso. Nakong ea ts'ebetso ea ho fetisa mocheso, mokelikeli oa metsi o lula o kopana le lerako la mocheso oa mocheso. Ka hona, ho fetisoa ha mocheso ho finyelloa ke ho phalla ha metsi ho sa khaotseng. Joale mocheso o fapanyetsana ka phapang ea mocheso pakeng tsamocheso oa mochesolebota le maro. Sena ke seo re buang ka sona kajeno: phetiso ea mocheso oa convection.
Lisebelisoa tsa mocheso oa lipoleiti li finyella phapanyetsano e sebetsang ea mocheso oa mocheso pakeng tsa maro a mabeli a nang le mocheso o fapaneng (hangata mokelikeli o batang le mokelikeli o chesang) sebakeng se ka thōko ka moralo o khethehileng oa sebopeho sa poleiti, ho tsamaisoa ha mokelikeli o qobelloang le tsela e sebetsang hantle ea ho fetisa mocheso. Mokhoa o ikhethileng oa ts'ebetso ke o latelang:
Bokhoni ba ho fetisa mocheso oa mochine oa mocheso oa poleiti bo itšetlehile haholo ka moralo o khethehileng oa lipoleiti tsa phapanyetsano ea mocheso. Mehaho ena e khetholla ka kotloloho mokhoa oa phallo le sebaka sa phetisetso ea mocheso ea mokelikeli, 'me ke motheo oa phetiso ea mocheso oa convective:
Moko oa ho fetisa mocheso ke motsoako oa "macro{0}}fluid flow + molecular micro{2}}heat transfer". Li-exchanger tsa mocheso li sebelisa matla a kantle (lipompo, li-fan) ho qobella phallo ea mokelikeli, ho tsamaisa mokhoa oa ho fetisa mocheso ka mehato e 'meli:
E khannoa ke lipompo tsa kantle, maro a batang le a chesang a kenella mecheng ea bona e ikemetseng ea phallo:
Mokelikeli o batang o kena ka har'a sete e 'ngoe ea likanale tsa phallo ho tsoa "sekoting sa mokelikeli o batang," hape o phallang ka mokhoa o moferefere, o fapanyetsana mocheso le lipoleiti.
Ka lebaka la likheo tse nyane haholo lipakeng tsa likanale tsa phallo (hangata limilimithara tse 2-5), mokelikeli o "petetsoa" nakong ea phallo, o matlafatsa phallo ea moferefere le ho thibela ho thekesela ha mokelikeli sebakeng se ka fokotsang katleho ea ho fetisa mocheso.
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Moko-taba oa phetisetso ea mocheso oa convective ke "ho fetisa mocheso ho tloha mokelikeli o chesang ho ea ho mokelikeli o batang". Letlapa le sebetsa e le mokhoa oa ho itšehla thajana le ho fetisa mocheso, o bapala karolo ea bohlokoa ho fetisa mocheso. E phethoa ka mehato e meraro:
Ea pele: Mokelikeli oa mocheso → Plate (Convection heat transfer)
Ha mokelikeli o chesang o phalla ka matla, -limolek'hule tsa mocheso o phahameng li thulana ka matla le bokaholimo ba poleiti, ho fetisetsa mocheso ho poleiti ka "convection" (ka nako ena, mocheso oa lehlakore la poleiti o haufi haholo le mokelikeli o chesang oa eketseha).
Lekhetlo la bobeli: ka hare ho poleiti (ho tsamaisa mocheso)
Lipoleiti li entsoe ka tšepe (tse nang le mocheso o phahameng oa mocheso, joalo ka tšepe e sa hloekang (hoo e ka bang 16W/(m・K) le motsoako oa titanium (hoo e ka bang 17W/(m・K))). Mocheso o fetisoa ka potlako ho tloha lehlakoreng le phahameng la mocheso (lehlakoreng la mokelikeli o chesang) ho ea tlase{4}}ka lehlakoreng le leng la mokelikeli o batang ka lehlakoreng la molek'hule o batang."
Lekhetlo la boraro: Plate → Mokelikeli o batang (ho fetisa mocheso oa convection):
Karolo e tlase-ea mocheso oa poleiti e kopana le mokelikeli o batang, 'me ka ho thulana ha limolek'hule tsa mokelikeli o batang phallong ea moferefere, mocheso o fetisetsoa mokelikeli o batang hape ka "convection" (ka nako ena mocheso oa mokelikeli o batang oa eketseha le mocheso oa mokelikeli o chesang oa fokotseha).
Ho phaella ho melao-motheo ea mantlha, lintlha tse latelang tsa moralo oa poleitimocheso oa mochesoe boetse e fana ka litiiso bakeng sa phetisetso ea mocheso oa convective: Sebopeho se ka senyehang: se boloka bohloeki.
Ka tloaelo, hobane mecha e 'meli e sebelisoang e fapane, matla a bona a phallo ka har'a thepa e boetse e fapane, e leng se ka lebisang phapang e kholo ea convective heat transfer.Convective heat transfer ka kakaretso e arotsoe ka maemo a mabeli. E 'ngoe ke phetisetso ea mocheso ea convection ea tlhaho, e leng phetisetso ea mocheso ea phallo e hlahisoang ke lithempereichara tse fapaneng le likhakanyo tsa mecha ea litaba tse peli leboteng. Ea bobeli e qobelloa ho fetisa mocheso oa mocheso, e leng ho phalla ha mocheso oa mocheso o hlahisoang ke matla a ka ntle a qobelloang (joaloka lipompo, li-fan le lisebelisoa tse ling) . Tabeng ea convection e qobelloang, tekanyo ea ho phalla ha metsi ka boeona e tla ba e phahameng ho feta tekanyo ea ho phalla sebakeng sa tlhaho, 'me katleho ea phetisetso ea mocheso oa convective e tla boela e be e phahameng. Ka mohlala, mocheso o fetisang mocheso oa moea ka phallo ea tlhaho ke 5 ~ 25W / (m2.℃feela), empa ha phallo e qobelloang e etsoa, mocheso oa mocheso oa moea o eketseha ho 10 ~ 100W (m2. degree).
Ho na le lintlha tse ngata tse amang ts'ebetso ea phetisetso ea mocheso, joalo ka sebopeho sa sebopeho sa mokelikeli ka boeona: letsoalo, matla a khethehileng a mocheso, mocheso o futhumatsang, joalo-joalo, hammoho le moralo oa sesebelisoa sa phapanyetsano ea mocheso ka boeona: boholo ba poleiti ea phapanyetsano ea mocheso, sebopeho sa poleiti, joalo-joalo, le mokhoa oa ho phalla oa seaplane ka har'a sesebelisoa, tseo kaofela li tla ama ts'ebetso ea 'nete ea phetisetso ea mocheso.