Date of Award

4-2005

Degree Name

Master of Science in Engineering

Department

Mechanical and Aeronautical Engineering

First Advisor

Dr. Ho Sung Lee

Second Advisor

Dr. Christopher Cho

Third Advisor

Dr. Iskender Sahin

Access Setting

Masters Thesis-Open Access

Abstract

Convective boiling experiments were conducted to show the effects of velocity, pressure, and subcooling on both water and a water-ethylene glycol mixture. Boiling curves were obtained in a 30 mm wide by 20 mm high rectangular channel with an upward facing 20 mm wide by 30 mm long rectangular copper heater. The velocity ranged from 0.5 m/s to 4.0 m/s, the pressure ranged from 1.0 atm to 2.6 atm, and the subcooling ranged from 10°C to 50°C. The curves were generated with measured heat fluxes up to 100W/cm2 . The inlet conditions of temperature, velocity, and pressure were maintained at constant values for each curve while the power to the heater was incrementally increased.

The use of both a pure fluid and a binary mixture showed different responses to the variables of pressure and subcooling. The results of this experiment showed that a binary mixture could not be treated as a pure substance when variations in subcooling and pressure were present. A high-speed camera was also used to allow for visual comparisons of boiling behavior.

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