Iipropati zokutshintshwa kobushushu be-foam yensimbi evulekileyo

I-Metal foam luhlobo lwezixhobo zetsimbi ezisebenzayo ezininzi eziqulethe inani elithile, ubungakanani obuthile be-pores, kunye ne-porosity ethile kwi-matrix yensimbi. Isinyithi esinegwebu sineempawu ezikhethekileyo zolwakhiwo olufana nommandla omkhulu ocacileyo, i-porosity enkulu, kunye noxinano oluncinci, kwaye ineempawu ezidibeneyo ezisebenzayo ezifana nokuchithwa kobushushu (iseli evulekileyo), ukugqunywa kobushushu (iseli evaliweyo), ukufunxwa kwesandi kunye nokungcangcazela, ubunzima. , amandla athile aphezulu, ukukhusela i-electromagnetic, njl. oomatshini, ii-acoustics, kunye nombane.
Kubai-open-cell metal foam, i-porosity ephezulu kunye ne-complex ye-mesh ye-three-dimensional mesh structure yenza ukuba ibe nokutshatyalaliswa kobushushu obuhle kakhulu kunye nokuhanjiswa kobushushu obuphezulu, obunombono obanzi kakhulu wesicelo kwintsimi ye-compact heat exchangers, ukupholisa isixhobo se-microelectronic, njalo njalo. Kwiipropati zokutshintshwa kobushushu be-open-cell foam metal, isimo sayo sophando siphandwa kwaye sihlalutywe kwiindawo zesicelo se-compact heat exchangers.
I-Metal foamkubatshintshi bobushushu obubambeneyo
Iimpawu zokufudumeza ubushushu ezongeziweyo zogwebu lwesinyithi ziye zabonwa ngokubanzi. Xa igesi okanye i-liquid igeleza emingxunyeni, ukushisa kudluliselwa kwaye kutshintshwa ngendlela yokunyanzeliswa kwe-convection phakathi kwe-foam yensimbi kunye nesakhiwo se-open-cell kunye ne-fluid. Ngakolunye uhlangothi, i-complex ye-mesh ye-mesh eyinkimbinkimbi ye-foam ye-metal yenza i-nonlinear effect ye-fluid, kunye ne-degree of turbulence iphinde iqiniswe, ngaloo ndlela ikhuthaza umgangatho oqinileyo kwi-fluid ekugqithiseni ukushisa kwendawo ephezulu; kwelinye icala, isinyithi ugwebu enkulu indawo ethile umphezulu kwakhona sisizathu esibalulekileyo isinyithi ukusebenza elungileyo transfer ubushushu. Okwangoku, uphononongo logwebu lwesinyithi lwentsebenzo yokutshintshiselana kobushushu obubambeneyo lugxile ikakhulu kwicala lomoya logqithiso lobushushu oluphuculweyo kunye necala lefriji eliphuculweyo lokudluliselwa kobushushu.
Kwicala lomoya eliphuculweyo leempawu zokuhambisa ubushushu besinyithi, igwebu lesinyithi lisetyenziswa endaweni yamaphiko okutshabalalisa ubushushu kwizicelo apho kusetyenziswa amaphiko emveli, njengokupholisa amacandelo e-elektroniki, iipleyiti zokutshintshiselana kobushushu, kunye nabatshintshisi bobushushu obufihliweyo. Kutshintshiselwano lobushushu obubambeneyo, iipropathi zokuhambisa ubushushu ngoku zifundelwa ikakhulu ubhedu kunye nesinyithi se-aluminiyam enogwebu oluxineneyo ngokubanzi ngaphantsi kwe-40% kunye neeporosity ezingama-70% nangaphezulu.
Kwinqanaba elithile le-pore, izinga lokutshintshwa kobushushu liyenyuka ngokunyuka kwe-porosity kwaye lilawula. Kwelinye icala, kwi-porosity ethile, kokukhona ukuxinana kwepore kuphezulu, kokukhona kusezantsi ukusebenza kakuhle kokuhanjiswa kobushushu, okunokuba kungenxa yobukhulu obugqithisileyo bepore. Ubume bepore parameters of porosity, ukuxinana kwepore, kunye nedayamitha yepore zezona zinto zichaphazela ukusebenza kobushushu bokuhambisa.amagwebu esinyithi. Ukusetyenziswa kwe-foam yesinyithi ekupholiseni amacandelo e-elektroniki, iziphumo ze-foam yensimbi kunye ne-pore diameter kwisiphumo sokutshatyalaliswa kobushushu ziye zaphandwa nge-experimenti ye-orthogonal. Iziphumo zibonisa ukuba phantsi kwe-convection enyanzeliswayo, ukusebenza kokushisa kokushisa kwesinyithi se-foam kuhambelana nesakhiwo se-pore, apho ubukhulu bepore bunempembelelo enkulu.
Ezinye iziphumo zophando zibonisa ukuba nangona isinyithi se-foam sinendima eyomeleleyo ekwandiseni ukuhanjiswa kobushushu, ukukhula kokumelana akuhoyi nto kunye nokukhula kokusebenza kobushushu. Ukusebenza kokuhanjiswa kobushushu kwesinyithi segwebu kuphuculwe kakhulu ekulahlekeni koxinzelelo oluncinci, kwaye ilahleko yoxinzelelo iyanda ngokunyuka koxinzelelo lwepore. Iziphumo zophononongo zifundisa ukuyila kunye nokwenziwa kwezinto zokutshintsha ubushushu obulula kunye ne-compact ephezulu esebenzayo. Uphononongo oluvavanyiweyo lwabatshintshi bobushushu besinyithi kunye ne-finned exchanger yobukhulu obufanayo lwenziwa, kwaye kwafunyaniswa ukuba phantsi kweemeko ezifanayo zovavanyo, i-foam metal heat exchanger yayingasebenzi kakuhle kunomtshintshi wobushushu ogqityiweyo, kunye nokulahleka koxinzelelo kunye noxinzelelo. i-friction coefficient ibiphezulu kunezo ze-finned heat exchanger. Isinyithi se-foam esine-porous sinempembelelo ecacileyo yokomeleza kwi-convective transfer heat, kwaye umphumo wokuqinisa uyancipha ngokunyuka kwenombolo yeReynolds; isinyithi esinegwebu esinezingxobo senza ukuchasana kokuhamba kolwelo kunyuke ngokucacileyo, kodwa ukuphindaphindwa kokunyuka kokumelana kuncipha ngokunyuka kwenani leReynolds. Ukuqiniswa okupheleleyo kokugqithiswa kobushushu obuguquguqukayo kunye nokwanda kokuhla koxinzelelo lokuhamba kwemiba emibini kunokubonwa,isinyithi esine-foam esiqhekezayolufaneleke ngakumbi ulwelo kunye namathuba amancinci omlinganiselo wokuqukuqela. Isinyithi esinegwebu sinendima yokuhanjiswa kobushushu kwicala lomoya, kodwa ukongezwa kokusebenza kobushushu ngaxeshanye, ukuchasana kuye kwanda, kwaye ukusebenza kukonke kubi kuneephiko zemveli. Uphando lubonisa ukuba i-foam metal ifanelekile kwiimeko ezinqabileyo eziphantsi. Ke ngoko, i-foam metal yomoya-icala elomelezelwe ukuhanjiswa kobushushu kufuneka ithathelwe ingqalelo amaxesha ezicelo, kwaye ayinakukwenza ngokumfamekileyo uphando olulolunye lokutshabalalisa ubushushu.

I-foam yensimbi inokudlala indima ekuphuculeni ukutshintshwa kobushushu befriji ngokutshintsha kwesigaba. Iziphumo zibonisa ukuba xa i-porosity iqinisekile, ukuhanjiswa kobushushu kuphindwe kabini njengoko ukuxinana kwe-pore kuncipha ukusuka kwi-20 ukuya kwi-40 ye-PPI kwaye ubungakanani bepore buyancipha, ngenxa yesakhiwo seseli esicolekileyo esinommandla omkhulu kunye nokuphazamiseka okukhulu. Kumazinga aphezulu okuhamba, i-coefficient yokudlulisa ubushushu obubilisiweyo igcina ukunyuka okuzinzileyo kunye nokucothayo kunye nokunyuka kokoma. Ngokunyuka ngokuthe ngcembe kuxinzelelo lokusebenza, isenzeko sokudlulisa ubushushu kwindawo eyomileyo ephantsi iyafana nokubilisa komhlaba, oko kukuthi, ukuhanjiswa kobushushu kuqiniswa ngokunyuka koxinzelelo, kodwa uxinzelelo luyenyuka ukuya kwinqanaba elithile ludlala indima ewohlokayo ekubiliseni. ukudluliselwa kobushushu. I-coefficient yokudlulisa ukushisa kweetyhubhu ze-foam zethusi malunga namaxesha amathathu aphezulu kuneetyhubhu ezikhanyayo. Kwimeko yefriji ecocekileyo, ubukho bensimbi ye-foam kwandisa ukuhamba kobushushu obubilisiweyo, kwaye i-coefficient yokudlulisa ubushushu yanda ukuya kwi-185%. Kwimeko yeemeko eziqulethe ioli, umphumo we-foam yensimbi ukuqinisa ukuhanjiswa kobushushu kuyancipha; phantsi kweemeko ezifanayo, xa kuthelekiswa ne-5PPI yensimbi ye-foam, i-10PPI yesinyithi ye-foam inokunyusa i-coefficient yokudlulisa ubushushu ukuya kumaxesha angama-0.6, kunye nobukhulu obuncinci bepore bunokuphucula ukuhamba okubilisiweyo kokushisa ubushushu.
Iimpembelelo zesantya sokuhamba kobunzima kunye nesigaba esibini sokoma kolwelo ekuthotyweni koxinzelelo lokuhamba koxinzelelo kunye ne-coefficient yokudluliselwa kobushushu ziye zahlalutywa ngokubanzi. Iziphumo zibonisa ukuba ukuhla koxinzelelo lwe-tube ye-foam yensimbi ye-annular yangaphakathi egcwele udonga lwangaphakathi likhulu kakhulu kunelo ityhubhu yokukhanya, kwaye ukunyanzeliswa koxinzelelo kwandisa ngokukhawuleza kwaye kungabonakali ngokunyuka kwesantya sokuhamba kunye nokoma. I-coefficient yokudlulisa ubushushu be-condensation yodonga lwangaphakathi oluzaliswe ludonga lwe-annular ityhubhu ye-foam inkulu kunelo ityhubhu yokukhanya, kwaye i-coefficient yokudlulisa ubushushu inyuka ngokunyuka kwezinga lokuhamba kunye nokoma, kunye ne-flow coefficient yokudlulisa ubushushu bolu hlobo. yeetyhubhu ezomeleziweyo malunga nokuphindwe kabini kunolo lwetyhubhu yokukhanya. Ngenxa yokuba umphumo wayo we-capillary ucacile, ubuninzi be-pore ye-130PPI ityhubhu eqiniweyo yimpembelelo engcono kakhulu, kwi-tube yokukhanya ngamaxesha e-3.06, ityhubhu ye-40PPI ifana kakhulu nesakhiwo sombhobho ophantsi njengendlela yokomeleza.
Kwisixhobo sokutshintshiselana sobushushu,igwebu lesinyithiingasetyenziswa ngokupheleleyo ukuqinisa indima yokudluliselwa kobushushu, kodwa uphononongo lubonise ukuba iimpawu zokuxhathisa ukukhula kwesinyithi se-foam nazo zibaluleke kakhulu, imfuneko yokusebenza ngokubanzi ukuvavanya ukusetyenziswa kwesinyithi sogwebu kwi-compact heat exchanger. Ukongeza, xa kukho izithambisi ezine-oyile, isinyithi sogwebu sinokukhokelela ekugqithisweni kobushushu, kunye nokuhanjiswa kobushushu okuphuculweyo kwamagwebu esinyithi ukutshintshwa kwesigaba sokutshintshwa kobushushu bezikhenkcezisi kufuneka kuthathelwe ingqalelo ekukhanyeni kweziphumo zezithambiso.