Abstract

The bubble nucleation temperature of water/methanol mixtures is measured using the fast transient process of thermal ink-jet printer technology. The heater element is placed in a dynamic bridge circuit coupled with an instrumentation amplifier to measure the change in resistance of the heater as a programmed voltage is applied across the bridge. An inflection point in the evolution of resistance signals bubble nucleation. A separate calibration relates resistance to average heater temperature.

The results show that the nucleation temperature increases as the power input to the bridge increases for a given concentration. The heating rates are extremely high, in some cases reaching over a quarter billion degrees per second. As methanol concentration increases, the nucleation temperature decreases. It was difficult to measure the nucleation temperature at high methanol dilution because the difference between liquid and vapor thermal conductivity decreases as methanol concentration increases for a given temperature. The nucleation temperatures are successfully correlated with a generalized corresponding states theory.

This content is only available via PDF.
You do not currently have access to this content.