20.500.12556/RUL-95513 Vrenje višjeogljičnih alkoholnih vodnih raztopin v mikrokanalih Boiling high-carbon alcohol aqueous solutions in microchannels V magistrski nalogi smo raziskovali vrenje višjeogljičnih alkoholnih vodnih raztopin v mikrokanalih. Obravnavali smo vpliv tlaka, temperature in pretoka delovnega fluida na proces vrenja v mikrokanalih. Testirani fluidi so 6 % vodna raztopina butanola, 2 % vodna raztopina pentanola, 0.6 % vodna raztopina heksanola, 0.15 % vodna raztopina heptanola in destilirana ter razplinjena voda. Uporabili smo testno sekcijo z mikrokanali kvadratnega preseka dimenzije 50 × 50 µm. Pri nastopu vrenja v mikrokanalih pri vodi je pri pretoku 1.00 ml/min bila temperatura 105 °C in je narasel tlak od 0.50 bar na 0.69 bar. Pri 6 % vodni raztopini butanola je bila temperatura vrenja 163 °C in je narasel tlak od 0.30 bar na 2.92 bar, pri 2 % vodni raztopini pentanola je bila temperatura 129 °C in je narasel tlak od 0.33 bar na 2.02 bar, pri 0.6 % vodni raztopini heksanola je bila temperatura 136 °C in je narasel tlak od 0.28 bar na 2.09 bar ter pri 0.15 % vodni raztopini heptanola je bila temperatura 108 °C in je narasel tlak od 0.38 bar na 0.79 bar. V primerjavi z vrenjem vode nastopa pri 6 % vodni raztopini butanola hitrejše podaljševanje vrelnega meniskusa in bolj megličasto vrenje. In this Master’s Thesis we have been researching the boiling phenomena of high-carbon alcohol aqueous solutions in microchannels. We have focused on the effect of pressure, temperature and volume flow rate of the working fluid on boiling process in microchannels. 6% aqueous solution of butanol, 2% aqueous solution of pentanol, 0.6% aqueous solution of hexanol, 0.15% aqueous solution of heptanol, distilled and degassed water were used as working fluids. Test section consisted of microchannels with 50 × 50 µm cross section. At the onset of boiling of water the temperature at 1.00 ml/min was 105 °C, the pressure risen from 0.50 to 0.69 bar. With 6% aqueous solution of butanol the boiling temperature was 163 °C and the pressure grown from 0.30 to 2.92 bar. At 2% aqueous solution of pentanol the temperature at the onset of boiling was 129 °C and the pressure went from 0.33 to 2.02 bar. At 0.6% aqueous solution of hexanol the temperature at the star of boiling was 136 °C and the pressure went from 0.28 to 2.09 bar and at 0.15% aqueous solution of heptanol 108 °C and the pressure went from 0.38 to 0.79 bar. In comparison to boiling of water we could see that the boiling meniscus elongation speed at 6% aqueous solution of butanol is much faster and the boiling itself was more eruptive. vrenje mikrokanali alkoholne vodne raztopine merjenje boiling microchannels alcohol aqueous solutions measurement true false false Slovenski jezik Angleški jezik Magistrsko delo/naloga 2017-09-20 14:54:46 2017-09-20 14:54:46 2022-08-10 06:27:41 0000-00-00 00:00:00 2017 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1970-01-01 201330 982.pdf 982.pdf 1 52767216805071E29B0548C944AE2BB9 e3e2d069e4912216dbd762da7f89495392d25e4c0e07ac9928074157c1a1d210 c6426a0a-a1b3-11eb-a523-00155dcfd717 20.500.12556/rul/4cb38c59-5dcb-4e79-a1f2-db924f8cf185 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=104118 Fakulteta za strojništvo 0 0 0