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    Marangoni effect on the size of dry spot and CHF in saturated pool boiling of pure water and RB solution

    Year: 2023

    Journal: International Communications in Heat and Mass Transfer, Volume 141, 2023-02-01, page 106601

    Authors: Wang, Jue; Wang, Zhentao; He, Sirong; Li, Bin; Wang, Junfeng

    Keywords: CHF; Dry spot; Marangoni effect; Microlayer; Saturated pool boiling

    In this study, saturated pool boiling experiment using transparent heating plate of ITO coating and numerical simulation by means of lattice Boltzmann method (LBM) are carried out to get further insights into the relationship between dry spot and CHF in saturated pool boiling of pure water and Rhodamine B(RB) solution. With a high speed camera, the gas-liquid phase, dry spot and nucleate site distributions at the heating surface have been recorded. The improved Shan-Chen model with large density ratio(TS = 0.8 × TC, ρl/ρv = 36.55) is applied to simulate the microlayer formation with changing wall temperature. The present results show that RB solution has lower onset of nucleate boiling(ONB) and higher CHF than pure water, the maximum size of dry spot in RB solution is only approximately 15.4% of that in pure water and the best concentration of RB solution for wettability of heating surface is 2000 ppm. Because of microlayer evaporation, annular bulge microlayer appears in saturated pool boiling of pure water. The solutal Marangoni effect in RB solution inhibits the evaporation of microlayer and increases the liquid distribution at heating surface. It is firstly found that CHF of RB solution is independent of wettability and affected by microlayer viscosity.
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