Vrenje višjeogljičnih alkoholnih vodnih raztopin v mikrokanalih

Kopač, Simon (author), Golobič, Iztok (mentor)

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.

• Language: Slovenian
• Keywords: vrenje, mikrokanali, alkoholne vodne raztopine, merjenje
• Work type: Master's thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2017
• PID: 20.500.12556/RUL-95513
• Publication date in RUL: 20.09.2017

Secondary language

• Language: English
• Title: Boiling high-carbon alcohol aqueous solutions in microchannels

Abstract

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.

• Keywords: boiling, microchannels, alcohol aqueous solutions, measurement