Experimental Study of Pool Boiling at Low Heat Flux in Water Miscible Binary Mixtures

Experimental studies are conducted to investigate pool boiling characteristics of water and its binary mixtures with ethanol and 2-propanol, at low heat fluxes. In-house fabricated experimental setup is used for the studies. Ethanol and 2-propanol are both water miscible and have a boiling point lower than that of pure water. The relation between the surface heat flux and degree of superheat for the above binary mixtures is obtained for low heat flux values in the range of 3 kW/m2 to 30 kW/m2. Variation of change in concentration and degree of superheat with time is reported for water miscible binary mixtures. The experimental results obtained are compared against the results predicted by correlations in the literature.