We propose to run a series of experiments designed to study vapor yield of water boiling due to reduced pressure in both microgravity and standard gravity conditions. We propose to vary three conditions during our experimental runs. The first variable condition will be ultrasonic stimulation of the provided bubble nucleation surface. The second variable will be the pressure to which the fluid is subjected. The third variable will be gravity.

Sample chambers containing a stratified combination of degassed oil, with a low specific gravity, and pure degassed water will be placed inside a vacuum chamber. A solenoid valve connected to the sample chambers will be opened, exposing the fluid to sub-vapor pressure conditions and initiating pressure boiling. As vapor forms inside the sample chambers, fluid will be forced out through the solenoid valve. Vapor yield will later be calculated by analyzing the amount of mass lost from the sample chambers as well as the test conditions. Measurements taken in standard gravity and microgravity conditions will be comparatively analyzed.

Our experiences and experimental results will be presented in various outreach programs to the engineering and educational communities. Presentations will be made to audiences of engineering societies, colleges, high schools, elementary schools, as well as the elderly. A web site will be created containing pertinent information as well as personal links to make further information available. Our journalists will supplement our outreach by involving local and national media sources.

Visit our web site at: University of Idaho Microgravity

Last Modified: Tue May 19 1998
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