Heat transfer by seepage in sand: Influence of saturated hydraulic conductivity and porosity
Vpliv koeficienta prepustnosti in poroznosti zemljin na prenos toplote s precejanjem
- Avtorji: Yaser Ghafoori, Matej Maček, Andrej Vidmar, Jaromír Říha, Andrej Kryžanowski
- Citat: Acta hydrotechnica, vol. 34, no. 60, pp. 61-75, 2021. https://doi.org/10.15292/acta.hydro.2021.05
- Povzetek: Prenos toplote s precejanjem v zemljinah predstavlja kompleksen problem. Na termično stanje zemljin vplivajo različni dejavniki, kot so toplotne in hidravlične lastnosti zemljin kot tudi njihova izpostavljenost obratovalnim pogojem ter omejitvam, ki jih narekujejo robni pogoji. V prispevku so predstavljeni rezultati raziskav prenosa toplote s precejanjem vode v zemljinah na podlagi primerjave laboratorijskih raziskav in računskega modela. Raziskavo smo usmerili v preučevanje vpliva koeficienta prepustnosti in poroznosti zemljine na proces prenosa toplote. Spremembe temperaturnega polja v eksperimentalni posodi smo merili z optičnimi kabli. Meritve temperaturnega polja v eksperimentalni posodi smo izvajali na treh različnih vzorcih kremenčevega peska s spreminjanjem stopnje poroznosti in koeficienta prepustnosti zemljine. Poleg eksperimentalnega dela smo zasnovali hidravlično-toplotni numerični model v programskem okolju FEFLOW za potrebe primerjalne analize merjenih in računskih vrednosti. Za ugotavljanje vpliva poroznosti in koeficienta prepustnosti v nasičeni zemljini na prenos toplote smo analizirali numerične modele za različne vrednosti teh dveh parametrov. Rezultati laboratorijskih preiskav in numeričnega modela so pokazali, da je hitrost prenosa toplote v materialih z večjim koeficientom prepustnosti večja, posledično je hitrejši upad temperature zaradi konvekcije. V bolj poroznih materialih je upad temperature zaznan kasneje, a je bolj izrazit in se približa vrednostim temperature okoliškega vodnega medija.
- Ključne besede: Prenos toplote, poroznost, koeficient prepustnosti, temperature, precejanje.
- Polno besedilo: a34yg.pdf
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