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  • Aqueous n-butanol solutions performing as a self-rewetting fluid during boiling in microchannels [Elektronski vir]
    Sitar, Anže ; Golobič, Iztok
    Experimental investigation of flow boiling in microchanne ls with hydraulic diameters of 25 [micro]m and 50 [micro]m was performed. Degassed double distilled water, dilute aqueous n-bu tanol ... solutions and 100 % butanol were used as the working fluids. The experimental results demonstrate an increased heat transfer coefficient during boiling of the butanol solutions compared to pure water, as the maximum temperatures achiev ed at the microchannel bottom were up to 10 K lower at the same heat flux. The high-speed visualization of aqueous butanol solutions boiling revealed the formation of a long and thick liquid film during the annular boiling regime, which was crucial fo r enhancing the heat transfer compared to the pure water or butanol. Analysis showed that the prolonged liquid film originated from the positive surface tension gradient, which is typical for aqueous solutions of long chain alcohols. The positive surface tension gradient and the consecutive Marangoni effect improved the wettability of the dr ied out surface of the microchannel. The aqueous butanol solu tions displayed the attributes of a self-rewetting fluid and enhanced heat transfer.
    Vir: Program and abstracts [Elektronski vir] (F. 26)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2015
    Jezik - angleški
    COBISS.SI-ID - 14019867

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