Ucwaningo lwakamuva lukaMartin Glicksman olumayelana nezinsimbi nezinto zokwakha lunomthelela embonini yokusungula, kodwa luphinde lube nokuxhumana okujulile komuntu siqu nokugqugquzelwa ozakwabo ababili abashona.googletag.cmd.push(umsebenzi() {googletag.display('div-gpt-ad-1449240174198-2′); });
Ucwaningo lukaGliksman oluthi “Surface Laplacian of the interfacial thermochemical potential: indima yalo ekwakhekeni kombuso wezigaba eziqinile neziwuketshezi” lushicilelwe kumagazini kaNovemba wejenali ehlanganyelwe i-Springer Nature Microgravity.Okutholakele kungaholela ekuqondeni kangcono ukuqina kokusakazwa kwensimbi, okuvumela onjiniyela bakhe izinjini ezihlala isikhathi eside nezindiza ezinamandla, kanye nokuqhubekisela phambili ukukhiqiza okungeziwe.
"Uma ucabanga ngensimbi, i-aluminium, ithusi - zonke izinto ezibalulekile zobunjiniyela, ukubunjwa, ukushisela kanye nokukhiqizwa kwensimbi okuyisisekelo - lezi yizimboni zezigidigidi zamadola ezinenani elikhulu emphakathini," kusho uGlicksman."Uzoqonda ukuthi sikhuluma ngezinto zokwakha, ngisho nentuthuko encane ingabaluleka."
Njengoba nje amanzi akha amakristalu lapho eba yiqhwa, kwenzeka okufanayo lapho ingxube yensimbi encibilikisiwe iqina ukuze yenze ukwakheka kwezinto ezibunjiwe.Ucwaningo lukaGliksman lubonisa ukuthi ngesikhathi sokuqiniswa kwama-alloys ensimbi, ukungezwani kwendawo phakathi kwekristalu nokuncibilika, kanye noshintsho ekujikeni kwekristalu njengoba ikhula, kubangela ukugeleza kokushisa ngisho nasezindaweni zokusebenzelana ezingaguquki.Lesi siphetho esiyisisekelo sihluke kakhulu ezisindweni zikaStefan ezivame ukusetshenziswa emcabangweni wokulingisa, lapho amandla ashisayo akhishwa ikristalu ekhulayo elingana ngokuqondile nezinga lokukhula kwawo.
U-Gliksman uqaphele ukuthi ukugoba kwekristalu kubonisa amandla ayo amakhemikhali: ijika eligobile lehlisa kancane indawo yokuncibilika, kuyilapho ukugoba kwe-concave kuliphakamisa kancane.Lokhu kwaziwa kakhulu ku-thermodynamics.Okusha futhi osekuqinisekisiwe ukuthi le gradient ye-curvature ibangela ukushisa okungeziwe ngesikhathi sokuqina, okungazange kucatshangelwe kumbono wendabuko wokuphonsa.Ukwengeza, lokhu kugeleza kokushisa "ku-deterministic" hhayi okungahleliwe, njengomsindo ongahleliwe, okuyinto ngokuyisisekelo ingalawulwa ngempumelelo ngesikhathi senqubo yokusakaza ukuze kuguqulwe i-microstructure ye-alloy nokuthuthukisa izakhiwo.
"Lapho une-crystalline microstructures eyiqhwa eqinile, kukhona ukushisa okubangelwa ukugoba okungalawuleka," kusho uGliksman."Uma kulawulwa izithasiselo zamakhemikhali noma imiphumela ebonakalayo efana nengcindezi noma amandla kazibuthe aqinile, lokhu kuguquguquka kokushisa ku-alloy castings kungathuthukisa i-microstructure futhi ekugcineni kulawule ama-alloys, izakhiwo ezishiselwe, kanye nezinto eziphrintiwe ze-3D."
Ngaphezu kokubaluleka kwalo kwesayensi, ucwaningo lwalubaluleke kakhulu ku-Glixman, sibonga kakhulu ngosizo oluwusizo lukazakwabo ongasekho.Omunye ozakwabo onjalo kwakunguPaul Steen, uprofesa we-fluid mechanics e-Cornell University, oshone ngonyaka odlule.Eminyakeni embalwa edlule, u-Steen wasiza u-Glicksman ocwaningweni lwakhe ngezinto ezitholakala ku-microgravity esebenzisa omakanika bemishini yoketshezi lwasemkhathini kanye nocwaningo lwempahla.I-Springer Nature yanikezela umagazini kaNovemba we-Microgravity ku-Steen futhi wathinta u-Gliksman ukuze abhale isihloko sesayensi mayelana nocwaningo ngokumhlonipha.
“Lokho kwangishukumisela ukuba ngihlanganise okuthile okuthakazelisayo uPaul ayengakujabulela ngokukhethekile.Kunjalo, abafundi abaningi balesi sihloko socwaningo nabo banentshisekelo ngendawo uPawulu afaka isandla kuyo, okuyi-interface thermodynamics,” kusho uGliksman.
Omunye uzakwabo owaphefumulela uGliksman ukuba abhale lesi sihloko kwakunguSemyon Koksal, uprofesa wezibalo, inhloko yomnyango kanye nephini likamongameli wezindaba zemfundo eFlorida Institute of Technology, owashona ngoMashi 2020. UGliksman umchaze njengomuntu onomusa, okhaliphile nobeyinjabulo. ukukhuluma naye, ephawula ukuthi wamsiza ukusebenzisa ulwazi lwakhe lwezibalo ocwaningweni lwakhe.
“Mina naye sasingabangane abakhulu futhi ewuthanda kakhulu umsebenzi wami.USemyon wangisiza lapho ngenza ama-equations ahlukene ukuchaza ukugeleza kokushisa okubangelwa ukugoba,” kusho uGliksman.“Sachitha isikhathi esiningi sixoxa ngezibalo zami nendlela yokuzakha, ukulinganiselwa kwazo, njll. Uyena kuphela umuntu engabonisana naye futhi waba usizo kakhulu ekwenzeni ithiyori yezibalo nokungisiza ngiyilungise.”
Ulwazi olwengeziwe: U-Martin E. Gliksman et al., I-Surface Laplacian yamandla ahlanganayo e-thermochemical: indima yawo ekwakhekeni kwemodi yoketshezi oluqinile, i-npj Microgravity (2021).I-DOI: 10.1038/s41526-021-00168-2
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